CROSS-REFERENCE

[0001] This application claims the benefit of U.S. Provisional Patent Application No.

62/861,878 filed on June 14, 2019, U.S. Provisional Patent Application No.62/856,598 filed on June 3, 2019, and U.S. Provisional Patent Application No.62/861,693 filed on June 14, 2019, the entire contents of each of which are incorporated herein by reference. BACKGROUND OF THE INVENTION

[0002] Extracellular concentrations of adenosine, a purine nucleoside, increase dramatically when cells are stressed or injured, or when neurotransmitters are released from neurons. This occurs in most, if not all, organs, including the nervous system. Cellular responses to adenosine are mediated via four G-protein-coupled receptors, which are designated A ₁ , A _2A , A _2B , and A ₃ . These adenosine receptor subtypes are found on many different cell types in most, if not all, tissues, and in at least some cases their expression is known to be increased in the presence of pathologies or diseases. While adenosine activates all four receptor subtypes, various compounds and drugs have different abilities to activate one subtype over the others.

Therapeutically, the use of a selective adenosine receptor agonist may have the advantage of avoiding potentially deleterious effects due to activation of one or more of the other subtypes.

[0003] Working through adenosine receptors, increased extracellular adenosine

concentrations can modulate responses from the innate immune system, inappropriate activation of which has been implicated in many diseases and conditions. Adenosine receptor activation can also alter the properties of astrocytes, microglia and neurons in the nervous system. Via one mechanism, activation of the A ₃ adenosine receptor (A ₃ AR) can inhibit the formation of the NLRP3 (NOD-like receptor family pyrin domain-containing 3) inflammasome, an intracellular multiprotein complex that causes the generation of interleukin-1 beta (IL- 1b). IL1-1b is a key mediator of acute and chronic inflammatory responses. Activation of A ₃ ARs with agonists has been shown to inhibit inflammasome activity and thereby reduce the inflammation and pain that are caused by IL-1b and other pro-inflammatory cytokines. Moreover, inflammasome-mediated chronic inflammation is often associated with cellular degeneration, for example, the loss of central nervous system cells in neurodegenerative conditions such as Alzheimer’s disease and Parkinson’s disease.

[0004] Chronic inflammatory diseases that affect various tissue types are also known to involve dysfunction of the cell’s mitochondria, which provide the energy needed to drive all cellular processes. Energy deficit potentiates cellular stress and when severe causes cellular degeneration. Mitochondrial dysfunction may cause inflammation and inflammation may cause mitochondrial dysfunction. A ₃ AR agonists are known to protect against mitochondrial insult and to inhibit cell degeneration.

[0005] Tissue inflammation is often accompanied by pain. Pain due to damage to the peripheral nerves and certain regions of the central nervous system is called neuropathic pain. Multiple lines of evidence indicate that some chronic inflammatory pain conditions, including, but not limited to, chronic neuropathic pain and chronic mixed-pain conditions (which combine ordinary inflammatory pain and neuropathic pain), involve inflammasome activity. Selective A ₃ AR agonists are analgesics in chronic inflammatory, neuropathic and mixed-pain conditions. A ₃ AR-mediated analgesia is accompanied by mitochondrial protection and by a decrease in the levels of IL-1b and other pro-inflammatory cytokines.

[0006] In the central nervous system, chronic inflammasome activity leading to increased levels of IL-1b and other pro-inflammatory cytokines induces a generalized impairment of cognitive function. For example, patients exposed to certain chemotherapeutic drugs develop a persistent (months to years) condition known as chemotherapy-induced cognitive impairment (“chemo-brain”;“chemo-fog”). Patients recovering from head trauma develop a similar syndrome (traumatic brain injury-induced cognitive dysfunction, or“post-concussion syndrome”). A cognitive impairment syndrome is also seen after surgery, especially after cardiopulmonary bypass surgery and especially in the elderly (post-operative cognitive dysfunction). Selective A ₃ AR agonists may treat and prevent cognitive impairment syndromes.

[0007] The innate immune system responds to various toxins, including certain plant alkaloids such as morphine and also its synthetic congeners (generically known as opioids). Exposure to analgesic levels of an opioid leads to inflammasome formation, increased levels of IL-1b and the pro-inflammatory cascade which contribute to many of the unwanted side-effects of opioids, including but not limited to physiological dependence (a contributor to addiction), and analgesic tolerance (the phenomenon whereby repeated doses of an opioid produce progressively less analgesia, thus requiring dose escalation to maintain adequate analgesia). Selective A ₃ AR agonists may attenuate opioid-induced inflammasome activation,

dependence/addiction and tolerance.

[0008] Generally, disease, trauma or other pathologies may lead to an upregulation of A ₃ ARs on cells, affording the opportunity for selective A ₃ AR agonists to treat or manage a wide variety of diseases and conditions suffered by humans and other animals.

[0009] There remains a need for adenosine receptor agonists for the treatment of disease. SUMMARY OF THE INVENTION

[0010] In some aspects, the present disclosure provides a compound represented by Formula (I):

or a salt thereof, wherein:

X is selected from N and C(H);

R ¹ is selected from O and S;

R ³ and R ⁴ are independently selected from hydrogen, -OH, and -NH ₂ ;

R ⁵ is -C(O)N(H)(R ¹¹ );

R ⁶ is selected from:

hydrogen and -OR ¹⁰ ; and

C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C _3- 12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

L is selected from C ₁ -C ₃ alkylene, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN; R ^7’ is independently selected from optionally C _3-12 carbocycle and optionally substituted 3- to 12-membered heterocycle; and when n is 0, R ^7’ is further selected from hydrogen and optionally substituted C _1-8 alkyl;

and wherein the C _3-12 carbocycle and 3- to 12-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , - C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

and wherein the C _1-8 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -S(O)R ¹² , - S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), and -CN;

R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , - S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), and -CN;

each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH2, C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _2-10 alkenyl, C _2-10 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle;

R ¹¹ is selected from hydrogen; and C ₁ alkyl and C ₃ -C ₆ alkyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , - N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN; and C ₂ alkyl substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹² is independently selected from hydrogen; and C _1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , and -NH2; and

n is 0 or 1.

[0011] In some aspects, the present disclosure provides a compound represented by Formula (III):

or a salt thereof, wherein:

X is selected from N and C(H);

R ¹ is selected from O, S, and C(R ²¹ ) ₂ ;

R ³ and R ⁴ are independently selected from hydrogen, -OH, and -NH2;

R ⁵ is selected from -CH ₂ OH and -C(O)N(H)(R ¹¹ );

R ²² is selected from hydrogen when R ¹ is selected from O and S; or when R ¹ is C(R ²¹ ) ₂ , R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle and the other R ²¹ is hydrogen;

each R ²¹ is hydrogen, or R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle and the other R ²¹ is hydrogen;

R ⁶ is selected from:

hydrogen and -OR ¹⁰ ; and

C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C3- 12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl;

L is selected from C1-C3 alkylene, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN; R ^7’ is independently selected from C _3-12 carbocycle and 3- to 12-membered heterocycle; and when n is 0, R ^7’ is further selected from hydrogen, optionally substituted C _1-6 alkyl, optionally substituted C _2-6 alkenyl, and optionally substituted C _2-6 alkynyl;

wherein the C _3-12 carbocycle and 3- to 12-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , - C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and wherein when R ⁵ is -CH2OH and -L-R ^7’ is benzyl, the benzyl is substituted with one or more substituents independently selected from -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -C(O)R ¹² , -C(O)OR ¹² , - OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and wherein the C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , - NO ₂ , =O, =S, =N(R ¹² ), -CN;

R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH2, C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _2-10 alkenyl, C _2-10 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle; and

R ¹¹ is selected from hydrogen; and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹² is independently selected from hydrogen; and C1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , and -NH2;

R ¹³ is selected from hydrogen; and

C ₁ - ₆ alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , - C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl; and

n is 0 or 1.

[0012] In some aspects, the present disclosure provides a compound represented by Formula (V):

or a salt thereof, wherein:

X is selected from N and C(H);

R ¹ is selected from O, S, and C(R ²¹ ) ₂ ;

R ³ and R ⁴ are independently selected from hydrogen, -OH, and -NH ₂ ;

R ⁵ is selected from -C(O)N(H)(R ¹¹ ), and when R ¹ is S or C(R ²¹ ) ₂ , R ⁵ is further selected from CH ₂ OH;

R ²² is selected from hydrogen; or when R ¹ is C(R ²¹ ) ₂ , R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle and the other R ²¹ is hydrogen;

each R ²¹ is hydrogen, or R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle and the other R ²¹ is hydrogen;

Ring A is selected from optionally substituted heteroaryl, and optionally substituted unsaturated heterocycle,

wherein the optionally substituted heteroaryl has one or more heteroatoms and no more than 2 nitrogen atoms, and

wherein the heteroaryl and the unsaturated heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

R ⁶ is selected from:

hydrogen and -OR ¹⁰ ; and

C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C3- 1 ₂ carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl;

wherein when R ⁶ is 2,2-diphenylethyl or tetrahydrofuranyl, R ¹¹ is selected from optionally substituted C ₁ alkyl, substituted C ₂ alkyl, and optionally substituted C _3-6 alkyl; L is selected from C1-C3 alkylene, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

R ^7’ is independently selected from optionally substituted C _3-12 carbocycle and optionally substituted 3- to 12-membered heterocycle; and when n is 0, R ^7’ is further selected from hydrogen, optionally substituted C _1-6 alkyl, optionally substituted C _2-6 alkenyl, and optionally substituted C _2-6 alkynyl;

wherein the C _3-12 carbocycle and 3- to 12-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , - C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

and wherein the C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , - NO ₂ , =O, =S, =N(R ¹² ), -CN;

R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH2, C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _2-10 alkenyl, C _2-10 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle; and

R ¹¹ is selected from hydrogen; and C ₁ - ₆ alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹² is independently selected from hydrogen; and C _1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , and -NH2; and

n is 0 or 1.

[0013] In certain aspects, the disclosure provides a pharmaceutical composition comprising a compound or salt of any one of the compound described herein and a pharmaceutically acceptable excipient.

[0014] In certain aspects, the disclosure provides a method for agonizing the A ₃ adenosine receptor comprising administering to a subject with a condition in need thereof a compound or salt described herein. In certain embodiments, the compound or salt agonizes the A ₃ adenosine receptor by ten-fold or greater relative to agonism of the A ₁ and A _2a receptors.

[0015] In certain embodiments, the disclosure provides a method of treating a condition selected from vascular inflammation, arthritis, allergies, asthma, wound healing, stroke, cardiac failure, acute spinal cord injury, acute head injury or trauma, seizure, neonatal hypoxia, cerebral palsy, chronic hypoxia due to arteriovenous malformations and occlusive cerebral artery disease, ischemia and reperfusion injury in skeletal muscle, severe neurological disorders related to excitotoxicity, Parkinson's disease, Huntington's chorea, diseases of the CNS, cardiac disease, kidney disease, glaucoma, cancer, neuropathic pain, transient ischemic attacks, myeloprotection, dry eye syndrome, osteoarthritis, rheumatoid arthritis, loss of skin pigmentation, inflammatory bowel disease, pulmonary inflammation, uveitis, and septic shock. In certain embodiments, the disclosure provides a method of treating neuropathic pain.

[0016] Additional aspects and advantages of the present disclosure will become readily apparent to those skilled in this art from the following detailed description, wherein only illustrative embodiments of the present disclosure are shown and described. As will be realized, the present disclosure is capable of other and different embodiments, and its several details are capable of modifications in various obvious respects, all without departing from the disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive. INCORPORATION BY REFERENCE

[0017] All publications, patents, and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference. To the extent publications and patents or patent applications incorporated by reference contradict the disclosure contained in the specification, the specification is intended to supersede and/or take precedence over any such contradictory material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The novel features of the invention are set forth with particularity in the appended claims. A better understanding of the features and advantages of the present invention will be obtained by reference to the following detailed description that sets forth illustrative

embodiments, in which the principles of the invention are utilized, and the accompanying drawings (also“figure” and“FIG.” herein), of which:

[0019] FIG.1 illustrates the reversal of mechano-allodynia over time exhibited by compound 1.76, respectively, in a chronic constriction injury model of neuropathic pain.

[0020] FIG.2 illustrates the reversal of mechano-allodynia over time exhibited by compound 1.62, respectively, in a chronic constriction injury model of neuropathic pain.

[0021] FIG.3 illustrates the reversal of mechano-allodynia over time exhibited by compound 1.45, respectively, in a chronic constriction injury model of neuropathic pain.

[0022] FIG.4 illustrates the reversal of mechano-allodynia over time exhibited by compound 2.35, respectively, in a chronic constriction injury model of neuropathic pain.

[0023] FIG.5. illustrates the reversal of mechano-allodynia over time exhibited by compound 1.68, respectively, in a chronic constriction injury model of neuropathic pain.

[0024] FIG.6 illustrates the reversal of mechano-allodynia over time exhibited by compound 1.72, respectively, in a chronic constriction injury model of neuropathic pain.

[0025] FIG.7 illustrates the reversal of mechano-allodynia over time exhibited by compound 1.58, respectively, in a chronic constriction injury model of neuropathic pain. DETAILED DESCRIPTION OF THE INVENTION

[0026] While various embodiments of the invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous variations, changes, and substitutions may occur to those skilled in the art without departing from the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed. A. Definitions

[0027] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as is commonly understood by one of skill in the art to which this invention belongs. All patents and publications referred to herein are incorporated by reference.

[0028] "Alkyl" refers to a straight or branched hydrocarbon chain radical consisting solely of carbon and hydrogen atoms, containing no unsaturation, and preferably having from one to fifteen carbon atoms (i.e., C1-C15 alkyl). In certain embodiments, an alkyl comprises one to thirteen carbon atoms (i.e., C1-C13 alkyl). In certain embodiments, an alkyl comprises one to eight carbon atoms (i.e., C ₁ -C ₈ alkyl). In other embodiments, an alkyl comprises one to five carbon atoms (i.e., C ₁ -C ₅ alkyl). In other embodiments, an alkyl comprises one to four carbon atoms (i.e., C1-C4 alkyl). In other embodiments, an alkyl comprises one to three carbon atoms (i.e., C1-C3 alkyl). In other embodiments, an alkyl comprises one to two carbon atoms (i.e., C1- C ₂ alkyl). In other embodiments, an alkyl comprises one carbon atom (i.e., C ₁ alkyl). In other embodiments, an alkyl comprises five to fifteen carbon atoms (i.e., C ₅ -C15 alkyl). In other embodiments, an alkyl comprises five to eight carbon atoms (i.e., C ₅ -C8 alkyl). In other embodiments, an alkyl comprises two to five carbon atoms (i.e., C ₂ -C ₅ alkyl). In other embodiments, an alkyl comprises three to five carbon atoms (i.e., C3-C ₅ alkyl). In certain embodiments, the alkyl group is selected from methyl, ethyl, 1-propyl (n-propyl), 1-methylethyl (iso-propyl), 1-butyl (n-butyl), 1-methylpropyl (sec-butyl), 2-methylpropyl (iso-butyl),

1,1-dimethylethyl (tert-butyl), 1-pentyl (n-pentyl). The alkyl is attached to the rest of the molecule by a single bond.

[0029] The term“Cx-y” when used in conjunction with a chemical moiety, such as alkyl, alkenyl, or alkynyl is meant to include groups that contain from x to y carbons in the chain. For example, the term“C _1-6 alkyl” refers to substituted or unsubstituted saturated hydrocarbon groups, including straight-chain alkyl and branched-chain alkyl groups that contain from 1 to 6 carbons. The term–C _x-y alkylene- refers to a substituted or unsubstituted alkylene chain with from x to y carbons in the alkylene chain. For example–C _1-6 alkylene- may be selected from methylene, ethylene, propylene, butylene, pentylene, and hexylene, any one of which is optionally substituted.

[0030] "Alkoxy" refers to a radical bonded through an oxygen atom of the formula–O-alkyl, where alkyl is an alkyl chain as defined above.

[0031] "Alkenyl" refers to a straight or branched hydrocarbon chain radical group consisting solely of carbon and hydrogen atoms, containing at least one carbon-carbon double bond, and preferably having from two to twelve carbon atoms (i.e., C2-C12 alkenyl). In certain

embodiments, an alkenyl comprises two to eight carbon atoms (i.e., C2-C8 alkenyl). In certain embodiments, an alkenyl comprises two to six carbon atoms (i.e., C2-C6 alkenyl). In other embodiments, an alkenyl comprises two to four carbon atoms (i.e., C2-C4 alkenyl). The alkenyl is attached to the rest of the molecule by a single bond, for example, ethenyl (i.e., vinyl), prop-1-enyl (i.e., allyl), but-1-enyl, pent-1-enyl, penta-1,4-dienyl, and the like.

[0032] "Alkynyl" refers to a straight or branched hydrocarbon chain radical group consisting solely of carbon and hydrogen atoms, containing at least one carbon-carbon triple bond, and preferably having from two to twelve carbon atoms (i.e., C2-C12 alkynyl). In certain

embodiments, an alkynyl comprises two to eight carbon atoms (i.e., C2-C8 alkynyl). In other embodiments, an alkynyl comprises two to six carbon atoms (i.e., C ₂ -C ₆ alkynyl). In other embodiments, an alkynyl comprises two to four carbon atoms (i.e., C ₂ -C ₄ alkynyl). The alkynyl is attached to the rest of the molecule by a single bond, for example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, and the like.

[0033] The terms“C _x-y alkenyl” and“C _x-y alkynyl” refer to substituted or unsubstituted unsaturated aliphatic groups analogous in length and possible substitution to the alkyls described above, but that contain at least one double or triple bond, respectively. The term–Cx- _y alkenylene- refers to a substituted or unsubstituted alkenylene chain with from x to y carbons in the alkenylene chain. For example,–C _2-6 alkenylene- may be selected from ethenylene, propenylene, butenylene, pentenylene, and hexenylene, any one of which is optionally substituted. An alkenylene chain may have one double bond or more than one double bond in the alkenylene chain. The term–C _x-y alkynylene- refers to a substituted or unsubstituted alkynylene chain with from x to y carbons in the alkenylene chain. For example,–C2- 6alkenylene- may be selected from ethynylene, propynylene, butynylene, pentynylene, and hexynylene, any one of which is optionally substituted. An alkynylene chain may have one triple bond or more than one triple bond in the alkynylene chain.

[0034] "Alkylene" or "alkylene chain" refers to a straight or branched divalent hydrocarbon chain linking the rest of the molecule to a radical group, consisting solely of carbon and hydrogen, containing no unsaturation, and preferably having from one to twelve carbon atoms, for example, methylene, ethylene, propylene, n-butylene, and the like. The alkylene chain is attached to the rest of the molecule through a single bond and to the radical group through a single bond. The points of attachment of the alkylene chain to the rest of the molecule and to the radical group may be through any two carbons within the chain. In certain embodiments, an alkylene comprises one to ten carbon atoms (i.e., C1-C8 alkylene). In certain embodiments, an alkylene comprises one to eight carbon atoms (i.e., C ₁ -C ₈ alkylene). In other embodiments, an alkylene comprises one to five carbon atoms (i.e., C1-C ₅ alkylene). In other embodiments, an alkylene comprises one to four carbon atoms (i.e., C1-C4 alkylene). In other embodiments, an alkylene comprises one to three carbon atoms (i.e., C1-C3 alkylene). In other embodiments, an alkylene comprises one to two carbon atoms (i.e., C1-C2 alkylene). In other embodiments, an alkylene comprises one carbon atom (i.e., C ₁ alkylene). In other embodiments, an alkylene comprises five to eight carbon atoms (i.e., C ₅ -C8 alkylene). In other embodiments, an alkylene comprises two to five carbon atoms (i.e., C2-C ₅ alkylene). In other embodiments, an alkylene comprises three to five carbon atoms (i.e., C ₃ -C ₅ alkylene).

[0035] "Alkenylene" or "alkenylene chain" refers to a straight or branched divalent hydrocarbon chain linking the rest of the molecule to a radical group, consisting solely of carbon and hydrogen, containing at least one carbon-carbon double bond, and preferably having from two to twelve carbon atoms. The alkenylene chain is attached to the rest of the molecule through a single bond and to the radical group through a single bond. The points of attachment of the alkenylene chain to the rest of the molecule and to the radical group may be through any two carbons within the chain. In certain embodiments, an alkenylene comprises two to ten carbon atoms (i.e., C2-C10 alkenylene). In certain embodiments, an alkenylene comprises two to eight carbon atoms (i.e., C2-C8 alkenylene). In other embodiments, an alkenylene comprises two to five carbon atoms (i.e., C ₂ -C ₅ alkenylene). In other embodiments, an alkenylene comprises two to four carbon atoms (i.e., C2-C4 alkenylene). In other embodiments, an alkenylene comprises two to three carbon atoms (i.e., C2-C3 alkenylene). In other embodiments, an alkenylene comprises two carbon atom (i.e., C ₂ alkenylene). In other embodiments, an alkenylene comprises five to eight carbon atoms (i.e., C ₅ -C ₈ alkenylene). In other embodiments, an alkenylene comprises three to five carbon atoms (i.e., C3-C ₅ alkenylene).

[0036] "Alkynylene" or "alkynylene chain" refers to a straight or branched divalent hydrocarbon chain linking the rest of the molecule to a radical group, consisting solely of carbon and hydrogen, containing at least one carbon-carbon triple bond, and preferably having from two to twelve carbon atoms. The alkynylene chain is attached to the rest of the molecule through a single bond and to the radical group through a single bond. The points of attachment of the alkynylene chain to the rest of the molecule and to the radical group may be through any two carbons within the chain. In certain embodiments, an alkynylene comprises two to ten carbon atoms (i.e., C ₂ -C ₁₀ alkynylene). In certain embodiments, an alkynylene comprises two to eight carbon atoms (i.e., C ₂ -C ₈ alkynylene). In other embodiments, an alkynylene comprises two to five carbon atoms (i.e., C2-C ₅ alkynylene). In other embodiments, an alkynylene comprises two to four carbon atoms (i.e., C2-C4 alkynylene). In other embodiments, an alkynylene comprises two to three carbon atoms (i.e., C ₂ -C ₃ alkynylene). In other embodiments, an alkynylene comprises two carbon atom (i.e., C2 alkynylene). In other embodiments, an alkynylene comprises five to eight carbon atoms (i.e., C ₅ -C ₈ alkynylene). In other embodiments, an alkynylene comprises three to five carbon atoms (i.e., C ₃ -C ₅ alkynylene).

[0037] "Aryl" refers to a radical derived from an aromatic monocyclic or aromatic multicyclic hydrocarbon ring system by removing a hydrogen atom from a ring carbon atom. The aromatic monocyclic or aromatic multicyclic hydrocarbon ring system contains only hydrogen and carbon and from five to eighteen carbon atoms, where at least one of the rings in the ring system is aromatic, i.e., it contains a cyclic, delocalized (4n+2) p–electron system in accordance with the Hückel theory. The ring system from which aryl groups are derived include, but are not limited to, groups such as benzene, fluorene, indane, indene, tetralin and naphthalene.

[0038] "Aralkyl" refers to a radical of the formula -R ^c -aryl where R ^c is an alkylene chain as defined above, for example, methylene, ethylene, and the like.

[0039] "Aralkenyl" refers to a radical of the formula–R ^d -aryl where R ^d is an alkenylene chain as defined above. "Aralkynyl" refers to a radical of the formula -R ^e -aryl, where R ^e is an alkynylene chain as defined above.

[0040] “Carbocycle” refers to a saturated, unsaturated or aromatic ring in which each atom of the ring is carbon. Carbocycle may include 3- to 10-membered monocyclic rings, 6- to 12- membered bicyclic rings, and 6- to 12-membered bridged rings. Each ring of a bicyclic carbocycle may be selected from saturated, unsaturated, and aromatic rings. An aromatic ring, e.g., phenyl, may be fused to a saturated or unsaturated ring, e.g., cyclohexane, cyclopentane, or cyclohexene. Any combination of saturated, unsaturated and aromatic bicyclic rings, as valence permits, are included in the definition of carbocyclic. Exemplary carbocycles include

cyclopentyl, cyclohexyl, cyclohexenyl, adamantyl, phenyl, indanyl, and naphthyl.

[0041] "Cycloalkyl" refers to a fully saturated monocyclic or polycyclic hydrocarbon radical consisting solely of carbon and hydrogen atoms, which includes fused or bridged ring systems, and preferably having from three to twelve carbon atoms. In certain embodiments, a cycloalkyl comprises three to ten carbon atoms. In other embodiments, a cycloalkyl comprises five to seven carbon atoms. The cycloalkyl may be attached to the rest of the molecule by a single bond.

Examples of monocyclic cycloalkyls include, e.g., cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl. Polycyclic cycloalkyl radicals include, for example, adamantyl, norbornyl (i.e., bicyclo[2.2.1]heptanyl), norbornenyl, decalinyl,

7,7-dimethyl-bicyclo[2.2.1]heptanyl, and the like.

[0042] "Cycloalkenyl" refers to a unsaturated non-aromatic monocyclic or polycyclic hydrocarbon radical consisting solely of carbon and hydrogen atoms, which includes fused or bridged ring systems, preferably having from three to twelve carbon atoms and comprising at least one double bond. In certain embodiments, a cycloalkenyl comprises three to ten carbon atoms. In other embodiments, a cycloalkenyl comprises five to seven carbon atoms. The cycloalkenyl may be attached to the rest of the molecule by a single bond. Examples of monocyclic cycloalkenyl includes, e.g., cyclopentenyl, cyclohexenyl, cycloheptenyl, and cyclooctenyl.

[0043] "Cycloalkylalkyl" refers to a radical of the formula–R ^c -cycloalkyl where R ^c is an alkylene chain as described above.

[0044] "Cycloalkylalkoxy" refers to a radical bonded through an oxygen atom of the formula –O-R ^c -cycloalkyl where R ^c is an alkylene chain as described above.

[0045] "Halo" or "halogen" refers to halogen substituents such as bromo, chloro, fluoro and iodo substituents.

[0046] As used herein, the term "haloalkyl" or“haloalkane” refers to an alkyl radical, as defined above, that is substituted by one or more halogen radicals, for example, trifluoromethyl, dichloromethyl, bromomethyl, 2,2,2-trifluoroethyl, 1-fluoromethyl-2-fluoroethyl, and the like. In some embodiments, the alkyl part of the fluoroalkyl radical is optionally further substituted. Examples of halogen substituted alkanes (“haloalkanes”) include halomethane (e.g.,

chloromethane, bromomethane, fluoromethane, iodomethane), di-and trihalomethane (e.g., trichloromethane, tribromomethane, trifluoromethane, triiodomethane), 1-haloethane, 2- haloethane, 1,2-dihaloethane, 1-halopropane, 2-halopropane, 3-halopropane, 1,2-dihalopropane, 1,3-dihalopropane, 2,3-dihalopropane, 1,2,3-trihalopropane, and any other suitable combinations of alkanes (or substituted alkanes) and halogens (e.g., Cl, Br, F, I, etc.). When an alkyl group is substituted with more than one halogen radicals, each halogen may be independently selected e.g., 1-chloro,2-fluoroethane.

[0047] "Fluoroalkyl" refers to an alkyl radical, as defined above, that is substituted by one or more fluoro radicals, for example, trifluoromethyl, difluoromethyl, fluoromethyl,

2,2,2-trifluoroethyl, 1-fluoromethyl-2-fluoroethyl, and the like.

[0048] “Heterocycle” refers to a saturated, unsaturated or aromatic rings comprising one or more heteroatoms. Exemplary heteroatoms include N, O, Si, P, B, and S atoms. Heterocycles include 3- to 10-membered monocyclic rings, 6- to 12-membered bicyclic rings, and 6- to 12- membered bridged rings. Each ring of a bicyclic heterocycle may be selected from saturated, unsaturated, and aromatic rings.“Heterocyclene” refers to a divalent heterocycle linking the rest of the molecule to a radical group

[0049] "Heteroaryl" or“aromatic heterocycle” refers to a radical derived from a a

heteroaromatic ring radical that comprises one to eleven carbon atoms and at least one heteroatom wherein each heteroatom may be selected from N, O, and S. As used herein, the heteroaryl ring may be selected from monocyclic or bicyclic and fused or bridged ring systems rings wherein at least one of the rings in the ring system is aromatic, i.e., it contains a cyclic, delocalized (4n+2) p–electron system in accordance with the Hückel theory. The heteroatom(s) in the heteroaryl radical may be optionally oxidized. One or more nitrogen atoms, if present, are optionally quaternized. The heteroaryl may be attached to the rest of the molecule through any atom of the heteroaryl, valence permitting, such as a carbon or nitrogen atom of the heteroaryl. Examples of heteroaryls include, but are not limited to, pyridine, pyrimidine, oxazole, furan, pyran, thiophene, isoxazole, benzimidazole, benzthiazole, and imidazopyridine. An“X- membered heteroaryl” refers to the number of endocylic atoms, i.e., X, in the ring. For example, a 5-membered heteroaryl ring or 5-membered aromatic heterocycle has 5 endocyclic atoms, e.g., triazole, oxazole, thiophene, etc.

[0050] The term“substituted” refers to moieties having substituents replacing a hydrogen on one or more carbons or substitutable heteroatoms, e.g., NH, of the structure. It will be understood that“substitution” or“substituted with” includes the implicit proviso that such substitution is in accordance with permitted valence of the substituted atom and the substituent, and that the substitution results in a stable compound, i.e., a compound which does not spontaneously undergo transformation such as by rearrangement, cyclization, elimination, etc. In certain embodiments, substituted refers to moieties having substituents replacing two hydrogen atoms on the same carbon atom, such as substituting the two hydrogen atoms on a single carbon with an oxo, imino or thioxo group. As used herein, the term“substituted” is contemplated to include all permissible substituents of organic compounds. In a broad aspect, the permissible substituents include acyclic and cyclic, branched and unbranched, carbocyclic and heterocyclic, aromatic and non-aromatic substituents of organic compounds. The permissible substituents can be one or more and the same or different for appropriate organic compounds. For purposes of this disclosure, the heteroatoms such as nitrogen may have hydrogen substituents and/or any permissible substituents of organic compounds described herein which satisfy the valences of the heteroatoms.

[0051] In some embodiments, substituents may include any substituents described herein, for example: halogen, hydroxy, oxo (=O), thioxo (=S), cyano (-CN), nitro (-NO ₂ ), imino (=N-H), oximo (=N-OH), hydrazino (=N-NH2), -R ^b -OR ^a , -R ^b -OC(O)-R ^a , -R ^b -OC(O)-OR ^a ,

-R ^b -OC(O)-N(R ^a ) ₂ , -R ^b -N(R ^a ) ₂ , -R ^b -C(O)R ^a , -R ^b -C(O)OR ^a , -R ^b -C(O)N(R ^a ) ₂ ,

-R ^b -O-R ^c -C(O)N(R ^a ) ₂ , -R ^b -N(R ^a )C(O)OR ^a , -R ^b -N(R ^a )C(O)R ^a , -R ^b -N(R ^a )S(O) _t R ^a (where t is 1 or 2), -R ^b -S(O)tR ^a (where t is 1 or 2), -R ^b -S(O)tOR ^a (where t is 1 or 2), and -R ^b -S(O)tN(R ^a ) ₂ (where t is 1 or 2); and alkyl, alkenyl, alkynyl, aryl, aralkyl, aralkenyl, aralkynyl, cycloalkyl, cycloalkylalkyl, and heterocycle any of which may be optionally substituted by alkyl, alkenyl, alkynyl, halogen, haloalkyl, haloalkenyl, haloalkynyl, oxo (=O), thioxo (=S), cyano (-CN), nitro (-NO ₂ ), imino (=N-H), oximo (=N-OH), hydrazine (=N-NH2), -R ^b -OR ^a , -R ^b -OC(O)-R ^a ,

-R ^b -OC(O)-OR ^a , -R ^b -OC(O)-N(R ^a ) ₂ , -R ^b -N(R ^a ) ₂ , -R ^b -C(O)R ^a , -R ^b -C(O)OR ^a , -R ^b -C(O)N(R ^a ) ₂ , -R ^b -O-R ^c -C(O)N(R ^a ) ₂ , -R ^b -N(R ^a )C(O)OR ^a , -R ^b -N(R ^a )C(O)R ^a , -R ^b -N(R ^a )S(O) _t R ^a (where t is 1 or 2), -R ^b -S(O)tR ^a (where t is 1 or 2), -R ^b -S(O)tOR ^a (where t is 1 or 2) and -R ^b -S(O)tN(R ^a ) ₂ (where t is 1 or 2); wherein each R ^a is independently selected from hydrogen, alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl, and heterocycle, wherein each R ^a , valence permitting, may be optionally substituted with alkyl, alkenyl, alkynyl, halogen, haloalkyl, haloalkenyl, haloalkynyl, oxo (=O), thioxo (=S), cyano (-CN), nitro (-NO ₂ ), imino (=N-H), oximo (=N-OH), hydrazine (=N-NH ₂ ), -R ^b -OR ^a , -R ^b -OC(O)-R ^a , -R ^b -OC(O)-OR ^a , -R ^b -OC(O)-N(R ^a ) ₂ , -R ^b -N(R ^a ) ₂ ,

-R ^b -C(O)R ^a , -R ^b -C(O)OR ^a , -R ^b -C(O)N(R ^a ) ₂ , -R ^b -O-R ^c -C(O)N(R ^a ) ₂ , -R ^b -N(R ^a )C(O)OR ^a , -R ^b -N(R ^a )C(O)R ^a , -R ^b -N(R ^a )S(O)tR ^a (where t is 1 or 2), -R ^b -S(O)tR ^a (where t is 1 or 2),

-R ^b -S(O)tOR ^a (where t is 1 or 2) and -R ^b -S(O)tN(R ^a ) ₂ (where t is 1 or 2); and wherein each R ^b is independently selected from a direct bond or a straight or branched alkylene, alkenylene, or alkynylene chain, and each R ^c is a straight or branched alkylene, alkenylene or alkynylene chain.

[0052] As used in the specification and claims, the singular form“a”,“an” and“the” includes plural references unless the context clearly dictates otherwise.

[0053] The term“salt” or“pharmaceutically acceptable salt” refers to salts derived from a variety of organic and inorganic counter ions well known in the art. Pharmaceutically acceptable acid addition salts can be formed with inorganic acids and organic acids. Inorganic acids from which salts can be derived include, for example, hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like. Organic acids from which salts can be derived include, for example, acetic acid, propionic acid, glycolic acid, pyruvic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, p-toluenesulfonic acid, salicylic acid, and the like. Pharmaceutically acceptable base addition salts can be formed with inorganic and organic bases. Inorganic bases from which salts can be derived include, for example, sodium, potassium, lithium, ammonium, calcium, magnesium, iron, zinc, copper, manganese, aluminum, and the like. Organic bases from which salts can be derived include, for example, primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines, basic ion exchange resins, and the like, specifically such as isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, and ethanolamine. In some embodiments, the pharmaceutically acceptable base addition salt is chosen from ammonium, potassium, sodium, calcium, and magnesium salts.

[0054] The phrases“parenteral administration” and“administered parenterally” as used herein means modes of administration other than enteral and topical administration, usually by injection, and includes, without limitation, intravenous, intramuscular, intraarterial, intrathecal, intracapsular, intraorbital, intracardiac, intradermal, intraperitoneal, transtracheal, subcutaneous, subcuticular, intraarticular, subcapsular, subarachnoid, intraspinal and intrasternal injection and infusion.

[0055] The phrase“pharmaceutically acceptable” is employed herein to refer to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.

[0056] The phrase“pharmaceutically acceptable excipient” or“pharmaceutically acceptable carrier” as used herein means a pharmaceutically acceptable material, composition or vehicle, such as a liquid or solid filler, diluent, excipient, solvent or encapsulating material. Each carrier must be“acceptable” in the sense of being compatible with the other ingredients of the formulation and not injurious to the patient. Some examples of materials which can serve as pharmaceutically acceptable carriers include: (1) sugars, such as lactose, glucose and sucrose; (2) starches, such as corn starch and potato starch; (3) cellulose, and its derivatives, such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; (4) powdered tragacanth; (5) malt; (6) gelatin; (7) talc; (8) excipients, such as cocoa butter and suppository waxes; (9) oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; (10) glycols, such as propylene glycol; (11) polyols, such as glycerin, sorbitol, mannitol and polyethylene glycol; (12) esters, such as ethyl oleate and ethyl laurate; (13) agar; (14) buffering agents, such as magnesium hydroxide and aluminum hydroxide; (15) alginic acid; (16) pyrogen- free water; (17) isotonic saline; (18) Ringer's solution; (19) ethyl alcohol; (20) phosphate buffer solutions; and (21) other non-toxic compatible substances employed in pharmaceutical formulations.

[0057] In certain embodiments, the term“prevent” or“preventing” as related to a disease or disorder may refer to a compound that, in a statistical sample, reduces the occurrence of the disorder or condition in the treated sample relative to an untreated control sample, or delays the onset or reduces the severity of one or more symptoms of the disorder or condition relative to the untreated control sample.

[0058] The terms“treat,”“treating” or“treatment,” as used herein, may include alleviating, abating or ameliorating a disease or condition symptoms, preventing additional symptoms, ameliorating or preventing the underlying causes of symptoms, inhibiting the disease or condition, e.g., arresting the development of the disease or condition, relieving the disease or condition, causing regression of the disease or condition, relieving a condition caused by the disease or condition, or stopping the symptoms of the disease or condition either prophylactically and/or therapeutically.

B. Compounds of the disclosure

[0059] In some aspects, the disclosure provides a compound represented by Formula (I):

or a salt thereof, wherein:

X is selected from N and C(H);

R ¹ is selected from O and S; R ³ and R ⁴ are independently selected from hydrogen, -OH, and -NH ₂ ;

R ⁵ is -C(O)N(H)(R ¹¹ );

R ⁶ is selected from:

hydrogen and -OR ¹⁰ ; and

C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C3- 12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

L is selected from C1-C3 alkylene, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN; R ^7’ is independently selected from optionally C _3-12 carbocycle and optionally substituted 3- to 12-membered heterocycle; and when n is 0, R ^7’ is further selected from hydrogen and optionally substituted C _1-8 alkyl;

and wherein the C _3-12 carbocycle and 3- to 12-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , - C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

and wherein the C _1-8 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -S(O)R ¹² , - S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), and -CN;

R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), and -CN;

each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH2, C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _2-10 alkenyl, C _2-10 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle;

R ¹¹ is selected from hydrogen; and C ₁ alkyl and C ₃ -C ₆ alkyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN; and C ₂ alkyl substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹² is independently selected from hydrogen; and C _1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , and -NH2; and

n is 0 or 1.

[0060] In some embodiments, a compound of Formula (I) is represented by Formula (IA): (IA) or a salt thereof.

[0061] In some embodiments, for a compound or salt of Formula (I) or (IA), X is selected from N and C(H). In some embodiments, X is C(H). In some embodiments, X is N.

[0062] In some embodiments, for a compound or salt of Formula (I) or (IA), R ¹ is selected from O and S. In some embodiments, R ¹ is O. In some embodiments, R ¹ is S.

[0063] In some embodiments, for a compound or salt of Formula (I) or (IA), R ³ and R ⁴ are independently selected from hydrogen and -OH. In some embodiments, R ³ and R ⁴ are independently selected from hydrogen and -NH ₂ . In some embodiments, R ³ and R ⁴ are independently selected from -OH and -NH ₂ . In some embodiments, R ³ and R ⁴ are each selected from two different substituents, for example, R ³ is hydrogen and R ⁴ is -OH. In some

embodiments, R ³ and R ⁴ are each selected from the same substituent, for example, R ³ is hydrogen and R ⁴ is hydrogen.

[0064] In some embodiments, for a compound or salt of Formula (I) or (IA), R ¹¹ of - C(O)N(H)(R ¹¹ ) is selected from hydrogen; and optionally substituted C1 alkyl and optionally substituted C ₃ -C ₆ alkyl each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) _2, -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -CN, and -NO ₂ . In some embodiments, R ¹¹ of -C(O)N(H)(R ¹¹ ) is selected from hydrogen; and optionally substituted C ₁ alkyl and optionally substituted C ₃ -C ₆ alkyl each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -CN, and -NO ₂ . In some embodiments, each R ¹⁰ of R ¹¹ is

independently selected from hydrogen; and C _1-6 alkyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle. In some embodiments, each R ¹⁰ of R ¹¹ is independently selected from hydrogen and C _1-6 alkyl. In some embodiments, each R ¹⁰ of R ¹¹ is independently selected from C _1-6 alkyl. In some embodiments, R ¹¹ of -C(O)N(H)(R ¹¹ ) is selected from hydrogen; and unsubstituted C1 alkyl and unsubstituted C ₃ -C ₆ alkyl.

[0065] In some embodiments, for a compound or salt of Formula (I) or (IA), R ¹¹ of - C(O)N(H)(R ¹¹ ) is C2 alkyl substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) _2, -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -CN, and -NO ₂ . In some embodiments, R ¹¹ of -C(O)N(H)(R ¹¹ ) is C ₂ alkyl substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -CN, and -NO ₂ , wherein R ¹⁰ at each occurrence is independently selected from hydrogen and C _1-6 alkyl.. In some embodiments, R ¹¹ of -C(O)N(H)(R ¹¹ ) is selected from hydrogen and methyl. In some embodiments, R ¹¹ of - C(O)N(H)(R ¹¹ ) is hydrogen. In some embodiments, R ⁵ is -C(O)N(H)(CH ₃ ).

[0066] In some embodiments, for a compound or salt of Formula (I) or (IA), L is selected from C1-C3 alkylene optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, and -CN. In some embodiments, L is selected from C1-C3 alkylene optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -NO ₂ , and -CN, wherein each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _3-12 carbocycle, and 3- to 12- membered heterocycle. In some embodiments, L is selected from C ₁ -C ₃ alkylene optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , and -CN. In some embodiments, L is selected from unsubstituted C1-C3 alkylene. In some embodiments, n is 1 and L is selected from methylene, ethylene, and propylene any of which is optionally substituted. In some embodiments, n is 1 and L is selected from methylene, ethylene, and propylene. In some embodiments, n is 1 and L is optionally substituted methylene. In some embodiments, n is 1 and L is optionally substituted ethylene. In some embodiments, n is 1 and L is optionally substituted propylene. In some embodiments, n is 0.

[0067] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from -OR ¹⁰ , optionally substituted C _1-6 alkyl, optionally substituted C _3-8 carbocycle, and optionally substituted 3- to 8-membered heterocycle.

[0068] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is an optionally substituted C _1-6 alkyl, wherein the optionally substituted C _1-6 alkyl is selected from optionally substituted C _1-2 alkyl, optionally substituted C _1-3 alkyl, optionally substituted C _1-4 alkyl, and optionally substituted C1-5 alkyl. In some embodiments, the optionally substituted C _1-6 alkyl of R ⁶ is selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, and hexyl. In some embodiments, the optionally substituted C _1-6 alkyl of R ⁶ is selected from methyl, ethyl, and propyl. In some embodiments, C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle. In some embodiments, C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -NO ₂ , =O, and -CN, wherein each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl.

[0069] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is an optionally substituted C3-8 carbocycle, wherein the optionally substituted C3-8 carbocycle is selected from optionally substituted C3-4 carbocycle, optionally substituted C3-5 carbocycle, optionally substituted C3-6 carbocycle, and optionally substituted C3-7 carbocycle. In some embodiments, the optionally substituted C3-8 carbocycle of R ⁶ is saturated. In some

embodiments, the optionally substituted C _3-8 carbocycle of R ⁶ is unsaturated. In some embodiments, the optionally substituted C3-8 carbocycle of R ⁶ is aromatic. In some

embodiments, the optionally substituted C3-8 carbocycle of R ⁶ is selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and phenyl. In some embodiments, the optionally substituted C3-8 carbocycle of R ⁶ is selected from cyclopropyl, cyclobutyl, and phenyl. In some embodiments, C3-6 carbocycle is optionally substituted with one or more substituents

independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, C _3-6 carbocycle is optionally substituted with one or more substituents independently selected from halogen, - OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl.

[0070] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is an optionally substituted 3- to 8-membered heterocycle, wherein the optionally substituted 3- to 8- membered heterocycle is selected from optionally substituted 3- to 4-membered heterocycle, optionally substituted 3- to 5-membered heterocycle, optionally substituted 3- to 6-membered heterocycle, and optionally substituted 3- to 7-membered heterocycle. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ is saturated. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ is unsaturated. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ is aromatic. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen, oxygen, and sulfur. In some embodiments, the 3- to 8- membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen and oxygen. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ comprises at least one nitrogen. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ comprises at least one oxygen. In some embodiments, the 3- to 6-membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , - C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, the 3- to 6-membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, -CN, C _1-6 alkyl, and C _1-6 haloalkyl, wherein each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl.

[0071] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from: -OR ¹⁰ ; C _1-6 alkyl, which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , -CN, C3-6 carbocycle, and 3- to 6- membered heterocycle, wherein C3-6 carbocycle, and 3- to 6-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 alkyl;

optionally substituted C _3-6 carbocycle, wherein the C _3-6 carbocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , - NO ₂ , =O, -CN; and

optionally substituted 3- to 6-membered heterocycle, wherein 3- to 6-membered heterocycle is optionally substituted with one or more substituents independently selected from C _1-6 alkyl, halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, and -CN. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl.

[0072] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from: -OR ¹⁰ wherein R ¹⁰ is selected from hydrogen and C _1-6 alkyl;

C _1-6 alkyl, which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -CN, C _3-6 carbocycle, and 3- to 6-membered heterocycle, wherein C3-6 carbocycle, and 3- to 6-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 alkyl;

optionally substituted C _3-6 carbocycle, wherein the C _3-6 carbocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , - NO ₂ , -CN; and

optionally substituted 3- to 6-membered heterocycle, wherein 3- to 6-membered heterocycle is optionally substituted with one or more substituents independently selected from C _1-6 alkyl, halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , and -CN. In some embodiments, each R ¹⁰ is

independently selected from hydrogen and C _1-6 alkyl.

[0073] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from: -OR ¹⁰ wherein R ¹⁰ is selected from hydrogen and C _1-6 alkyl; C _1-6 alkyl, which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -CN, C ₆ carbocycle, and 5- to 6-membered heteroaryl, wherein C ₆ carbocycle, and 5- to 6-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, and C _1-6 alkyl;

optionally substituted saturated C _3-6 carbocycle, wherein the C _3-6 carbocycle is optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , and -CN. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl.

[0074] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from: -OR ¹⁰ wherein R ¹⁰ is selected from hydrogen and C _1-6 alkyl; C _1-6 alkyl, which is optionally substituted with one or more substituents independently selected from halogen and 5-membered heteroaryl, wherein the 5-membered heterocycle is optionally substituted with one or more substituents independently selected from C _1-6 alkyl;

optionally substituted saturated C _3-4 carbocycle, wherein the C _3-4 carbocycle is optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , and -CN. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl.

[0075] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is -OR ¹⁰ . In some embodiments, R ¹⁰ of -OR ¹⁰ is selected from hydrogen and C _1-6 alkyl. In some

embodiments, R ⁶ is -OH. In some embodiments, R ⁶ is hydroxy. In some embodiments, R ¹⁰ of - OR ¹⁰ is selected from C _1-3 alkyl. In some embodiments, R ¹⁰ of -OR ¹⁰ is selected from methyl, ethyl, and propyl. In some embodiments, R ¹⁰ of -OR ¹⁰ is ethyl. In some embodiments, R ⁶ is

[0076] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, optionally substituted C3-6 carbocycle, and optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, optionally substituted C3-6 carbocycle, and optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from unsubstituted C _1-3 alkyl. In some embodiments, R ⁶ is selected from and

In some embodiments, R ⁶ is In some embodiments, R ⁶ In some embodiments, R ⁶ is

[0077] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen. In some embodiments, R ⁶ is C1-3 alkyl optionally substituted with one or more substituents independently selected from halogen. In some embodiments, R ⁶ is C _2-3 alkyl optionally substituted with one or more substituents independently selected from halogen. In some embodiments, R ⁶ is C1-3 alkyl optionally substituted with one or more substituents independently selected from fluorine, chlorine, bromine, and iodine. In some embodiments, R ⁶ is C _1-3 alkyl substituted with one, two, or three halogen atoms. In some embodiments, R ⁶ is C _1-3 alkyl substituted with two halogen atoms. In some embodiments, R ⁶ is C1-3 alkyl substituted with one or more substituents selected from fluorine. In some embodiments, R ⁶ is C2-3 alkyl substituted with one or more substituents selected from fluorine. In some embodiments, R ⁶ is C _1-3 alkyl substituted with one, two, or three fluorine atoms. In some embodiments, R ⁶ is C1-3 alkyl

substituted with two fluorine atoms. In some embodiments, R ⁶ is selected from and

In some embodiments, R ⁶ is . In some embodiments, R ⁶ is

[0078] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from C _1-6 alkyl substituted with one or more substituents independently selected from optionally substituted C _3-6 carbocycle. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with one or more substituents independently selected from optionally substituted C _3-6 carbocycle. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted C3-6 carbocycle.

[0079] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from C1-3 alkyl substituted with one or more substituents independently selected from optionally substituted phenyl. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted phenyl. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with phenyl, wherein the phenyl is substituted with one or more halogens. In some

embodiments, R ⁶ is selected from C1-3 alkyl substituted with phenyl, wherein the phenyl is substituted with one or more halogens atoms selected from fluorine, chlorine, bromine and iodine. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with phenyl, wherein the phenyl is substituted with one chlorine atom. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with phenyl, wherein the phenyl is substituted with one or more chlorine atoms.

In some embodiments, R ⁶ is .

[0080] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from C _1-6 alkyl substituted with one or more substituents independently selected from optionally substituted 3- to 6-membered heterocycle. In some embodiments, the optionally substituted 3- to 6-membered heterocycle comprises at least one heteroatom selected from nitrogen, oxygen, sulfur, and any combination thereof. In some embodiments, the optionally substituted 3- to 6- membered heterocycle comprises at least one heteroatom selected from nitrogen, oxygen, and any combination thereof. In some embodiments, the optionally substituted 3- to 6-membered heterocycle is aromatic. In some embodiments, the optionally substituted 3- to 6-membered heterocycle is non-aromatic. In some embodiments, the optionally substituted 3- to 6-membered heterocycle is saturated. In some embodiments, the optionally substituted 3- to 6-membered heterocycle is unsaturated. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with one or more substituents independently selected from optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with an optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with optionally substituted 3-membered heterocycle. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 4-membered heterocycle. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 5-membered heterocycle.

[0081] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 5-membered heterocycle, wherein the 5- membered heterocycle comprises at least one heteroatom selected from nitrogen, oxygen, sulfur, and any combination thereof. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 5-membered heterocycle, wherein the 5-membered heterocycle comprises at least one heteroatom selected from nitrogen, oxygen, and any combination thereof. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with optionally substituted 5- membered heterocycle, wherein the 5-membered heterocycle comprises at least one heteroatom selected from nitrogen. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 5-membered heterocycle, wherein the 5-membered heterocycle comprises at least one heteroatom selected from oxygen. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted isoxazole. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with isoxazole, wherein the isoxazole is substituted with one or more

substituents selected from C _1-6 alkyl. In some embodiments, R ⁶ is

[0082] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is an optionally substituted C3-10 carbocycle. In some embodiments, R ⁶ is an optionally substituted C3- 6 carbocycle. In some embodiments, the optionally substituted C3-6 carbocycle of R ⁶ is saturated. In some embodiments, the optionally substituted C _3-6 carbocycle of R ⁶ is unsaturated. In some embodiments, the optionally substituted C _3-6 carbocycle of R ⁶ is aromatic. In some embodiments, the C3-6 carbocycle of R ⁶ is unsubstituted. In some embodiments, the optionally substituted C3-6 carbocycle of R ⁶ is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, the optionally substituted C3-6 carbocycle of R ⁶ is optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, the optionally substituted C _3-6 carbocycle of R ⁶ is selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, optionally substituted cyclopentyl, optionally substituted cyclohexyl and optionally substituted phenyl. In some embodiments, the optionally substituted C _3-6 carbocycle of R ⁶ is selected from optionally substituted cyclobutyl and optionally substituted cyclopropyl. In some embodiments, the C _3-6 carbocycle of R ⁶ is selected from unsubstituted cyclobutyl and unsubstituted cyclopropyl. In some embodiments, R ⁶ is selected from In some embodiments, R ⁶ is In some embodiments, R ⁶ is

[0083] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is a 3- to 10-membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, R ⁶ is a 3- to 10-membered heterocycle optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, R ⁶ is a 3- to 10-membered heterocycle is optionally substituted with one or more substituents independently selected from C _1-6 alkyl. In some embodiments, R ⁶ is a 3- to 5- membered heterocycle is optionally substituted with one or more substituents independently selected from C _1-6 alkyl. In some embodiments, R ⁶ is a 3- to 5-membered heterocycle is optionally substituted with one or more substituents independently selected from C1-3 alkyl. In some embodiments, the 3- to 5-membered heterocycle of R ⁶ is saturated. In some embodiments, the 3- to 5-membered heterocycle of R ⁶ is unsaturated. In some embodiments, the optionally substituted 3- to 5-membered heterocycle of R ⁶ is aromatic. In some embodiments, the optionally substituted 3- to 5-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen, oxygen, sulfur, or any combination thereof. In some embodiments, the optionally substituted 3- to 5-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen, oxygen, or any combination thereof. In some embodiments, the optionally substituted 3- to 5-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen and oxygen. In some embodiments, the optionally substituted 3- to 5- membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen. In some embodiments, the optionally substituted 3- to 5-membered heterocycle of R ⁶ comprises at least one heteroatom selected from oxygen. In some embodiments, the optionally substituted 3- to 5- membered heterocycle of R ⁶ is selected from optionally substituted 3-membered heterocycle, optionally substituted 4-membered heterocycle, and optionally substituted 5-membered heterocycle. In some embodiments, the optionally substituted 3- to 5-membered heterocycle of R ⁶ is a 4-membered heterocycle. In some embodiments, the optionally substituted 4-membered heterocycle of R ⁶ is saturated. In some embodiments, the optionally substituted 4-membered heterocycle of R ⁶ is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, -CN, C _1-6 alkyl, C _1-6 haloalkyl. In some embodiments, R ⁶ is 4- to 5-membered heterocycle, which is optionally substituted with one or more

substituents independently selected from C _1-6 alkyl. In some embodiments, R ⁶ is selected from

optionally substituted azetidine. In some embodiments, R ⁶ is

[0084] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected

from

M

[0085] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected

from

[0086] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7' is independently selected from hydrogen; and C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , - C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; wherein C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl are optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , - S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), and -CN. [0087] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7' is C _3-12 carbocycle which is optionally substituted. In some embodiments, the optionally substituted C3- ₁₂ carbocycle of R ^7' is saturated. In some embodiments, the optionally substituted C _3-12 carbocycle of R ^7' is unsaturated. In some embodiments, the optionally substituted C _3-12 carbocycle of R ^7' is aromatic. In some embodiments, R ^7' is unsubstituted C _3-12 carbocycle. In some embodiments, R ^7' is C _3-6 carbocycle which is optionally substituted. In some embodiments, the C3-6 carbocycle of R ^7' is selected from C3 carbocycle, C4 carbocycle, C ₅ carbocycle, and C6 carbocycle any of which is optionally substituted. In some embodiments, R ^7' is C7-12 carbocycle which is optionally substituted. In some embodiments, the C _7-12 carbocycle of R ^7' is selected from C ₇ carbocycle, C ₈ carbocycle, C ₉ carbocycle, C ₁₀ carbocycle, C ₁₁ carbocycle, and C ₁₂ carbocycle any of which is optionally substituted. In some embodiments, the optionally substituted C _3-12 carbocycle of R ^7' is a bicyclic, for example norboranyl, norbornenyl, naphthalyl, decalinyl, or spirodecanyl.

[0088] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7' is 3- to 12- membered heterocycle which is optionally substituted. In some embodiments, R ^7' is 3- to 12- membered heterocycle which is optionally substituted. In some embodiments, the optionally substituted 3- to 12-membered heterocycle of R ^7' is unsubstituted. In some embodiments, the optionally substituted 3- to 12-membered heterocycle of R ^7' is unsaturated. In some

embodiments, the optionally substituted 3- to 12-membered heterocycle of R ^7' is aromatic. In some embodiments, R ^7' is 3- to 6-membered heterocycle. In some embodiments, the 3- to 6- membered heterocycle of R ^7' is selected from 3-membered heterocycle, 4-membered

heterocycle, 5-membered heterocycle, and 6-membered heterocycle any of which is optionally substituted. In some embodiments, R ^7' is 7- to 12-membered heterocycle. In some embodiments, the 7- to 12-membered heterocycle of R ^7' is selected from 7-membered heterocycle, 8-membered heterocycle, 9-membered heterocycle, 10-membered heterocycle, 11-membered heterocycle, and 12-membered heterocycle any of which is optionally substituted.

[0089] In some embodiments, for a compound or salt of Formula (I) or (IA), the optionally substituted 3- to 12-membered heterocycle of R ^7' is an optionally substituted 5- to 6-membered heterocycle. In some embodiments, the optionally substituted 5- to 6-membered heterocycle of R ^7' is selected from pyrrolidine, pyrroline, pyrrole, pyrazolidine, imidazolidine, pyrazoline, imidazoline, pyrazole, imidazole, piperidine, pyridine, piperazine, pyridazine, pyrimidine, and pyrazine. In some embodiments, R ^7' is selected from piperidine, pyridine, piperazine, pyridazine, pyrimidine, and pyrazine any of which is optionally substituted. In some embodiments, R ^7' is selected from pyridine, pyridazine, pyrimidine, and pyrazine any of which is optionally substituted. In some embodiments, R ^7' is optionally substituted pyridine. [0090] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7' is C1-8 alkyl which is optionally substituted. In some embodiments, R ^7' is C1-8 alkyl which is substituted. In some embodiments, R ^7' is C _1-8 alkyl which is unsubstituted. In some embodiments, R ^7' is selected from C1-2 alkyl, C1-3 alkyl, C1-4 alkyl, C1-5 alkyl, C _1-6 alkyl, and C1-7 alkyl any of which is optionally substituted. In some embodiments, R ^7' is C _1-6 alkyl which is optionally substituted. In some embodiments, C _1-6 alkyl of R ^7' is selected from C ₁ alkyl, C ₂ alkyl, C ₃ alkyl, C ₄ alkyl, C ₅ alkyl, and C6 alkyl any of which is optionally substituted. In some embodiments, C _1-6 alkyl of R ^7' is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl.

[0091] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected from optionally substituted phenyl and optionally substituted 5-membered heteroaryl. In some embodiments, R ^7’ is an optionally substituted phenyl. In some embodiments, R ^7’ is an optionally substituted 5-membered heteroaryl. In some embodiments, the substituents on R ^7’ are

independently selected at each occurrence from halogen, -OH, -NH ₂ , -NO ₂ , -CN, and C _1-3 alkyl, wherein C1-3 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OH, -NH2, -NO ₂ , and -CN.

[0092] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is independently selected from hydrogen, optionally substituted C3-6 carbocycle, optionally substituted 3- to 6-membered heterocycle, and optionally substituted C1-8 alkyl; wherein the C3-6 carbocycle and 3- to 6-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and wherein the C1-8 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, and -CN.

[0093] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is independently selected from hydrogen, optionally substituted C3-6 carbocycle, optionally substituted 3- to 6-membered heterocycle, and optionally substituted C _1-6 alkyl; wherein the C _3-6 carbocycle and 3- to 6-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and wherein the C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, and -CN.

[0094] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is independently selected from hydrogen, optionally substituted cyclopropyl, optionally substituted cyclobutyl, optionally substituted phenyl, optionally substituted 3- to 6-membered heterocycle, and optionally substituted C _1-6 alkyl; wherein the cyclopropyl, cyclobutyl, phenyl, and 3- to 6- membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and wherein the C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen and -OR ¹² .

[0095] In some embodiments, for a compound or salt of Formula (I) or (IA), when n is 0 R ^7’ is independently selected from hydrogen, optionally substituted cyclopropyl, optionally substituted phenyl, optionally substituted 6-membered heteroaryl, and optionally substituted C _1-6 alkyl; wherein the cyclopropyl, cyclobutyl, phenyl, and 6-membered heteroaryl are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl, wherein each R ¹² is independently selected from hydrogen and C1-3 alkyl; wherein the C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen and -OR ¹² , wherein each R ¹² is independently selected from hydrogen and C _1-3 alkyl; and

when n is 1, R ^7’ is independently selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, and optionally substituted phenyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , - NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl, wherein each R ¹² is independently selected from hydrogen and C1-3 alkyl.

[0096] In some embodiments, for a compound or salt of Formula (I) or (IA), when n is 0, R ^7’ is independently selected from hydrogen, unsubstituted cyclopropyl, optionally substituted cyclobutyl, optionally substituted phenyl, optionally substituted 6-membered heteroaryl, and optionally substituted C _1-6 alkyl; wherein the phenyl and 6-membered heteroaryl are each optionally substituted with one or more substituents independently selected from -OR ¹² , wherein each R ¹² is independently selected from C1-3 alkyl; wherein the C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen and -OR ¹² , wherein each R ¹² is independently selected from hydrogen and C _1-3 alkyl;

and when n is 1, R ^7’ is independently selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, and optionally substituted phenyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -NO ₂ , -CN, C _1-6 alkyl, and C _1-6 haloalkyl, wherein R ¹² is independently selected from C _1-3 alkyl.

[0097] In some embodiments, for a compound or salt of Formula (I) or (IA), when n is 0, R ^7’ is independently selected from hydrogen, unsubstituted cyclopropyl, optionally substituted phenyl, unsubstituted 6-membered heteroaryl, and optionally substituted C _1-6 alkyl; wherein the phenyl is optionally substituted with one or more substituents independently selected from - OR ¹² , wherein each R ¹² is independently selected from C _1-3 alkyl; wherein the C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen and - OR ¹² , wherein each R ¹² is independently selected from C1-3 alkyl; and

when n is 1, R ^7’ is independently selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, and optionally substituted phenyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , C _1-6 alkyl, and C _1-6 haloalkyl, wherein R ¹² is independently selected from C _1-3 alkyl.

[0098] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is an optionally substituted C _1-6 alkyl. In some embodiments, R ^7' is selected from C1-2 alkyl, C1-3 alkyl, C _1-4 alkyl, C _1-5 alkyl, and C _1-6 alkyl, any of which is optionally substituted. In some

embodiments, R ^7' is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl. In some embodiments, the C _1-6 alkyl of R ^7’ is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , and -CN. In some embodiments, n is 0 and R ^7’ is an optionally substituted C _1-6 alkyl. In some embodiments, n is 0 and the optionally substituted C _1-6 alkyl of R ^7’ is substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , and -CN.

[0099] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen. In some embodiments, n is 0 and R ^7’ is C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen. In some embodiments, the C _1-6 alkyl of R ^7’ is substituted with one or more substituents independently selected from halogen. In some embodiments, the halogen is selected from fluorine, chlorine, bromine, and iodine. In some embodiments, the halogen is selected from fluorine, chlorine, and bromine. In some

embodiments, the C _1-6 alkyl of R ^7’ is substituted with one or more fluorine atoms. In some

embodiments, n is 0 and R ^7’ is selected from In some embodiments, n is 0 and R ^7’ is selected from

some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is . In some embodiments, n is 0 and R ^7’ is [00100] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is C _1-6 alkyl substituted with one or more substituents independently selected from -OR ¹² . In some embodiments, n is 0 and the C _1-6 alkyl of R ^7’ is substituted with one or more substituents independently selected from -OR ¹² . In some embodiments, n is 0 and the C _1-6 alkyl of R ^7’ is independently substituted with one substituent selected from -OR ¹² . In some embodiments, R ¹² of -OR ¹² is independently selected from hydrogen and C _1-3 alkyl. In some embodiments, R ¹² of - OR ¹² is independently selected from C1-3 alkyl. In some embodiments, R ¹² of -OR ¹² is from C1

alkyl. In some embodiments, R ^7’ is In some embodiments n is 0 and R ^7’ is

[00101] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is unsubstituted C _1-6 alkyl. In some embodiments, n is 0 and R ^7’ is unsubstituted C _1-6 alkyl. In some

embodiments, n is 0 and R ^7’ is selected from a d . In some embodiments, n is

0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is

[00102] In some embodiments, for a compound or salt of Formula (I) or (IA), n is 0 and R ^7’ is

selected from , , , ,

[00103] In some embodiments, for a compound or salt of Formula (I) or (IA), n is 0 and R ^7’ is

selected from

[00104] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected from hydrogen; and C _3-6 carbocycle and 5- to 9-membered heterocycle, wherein each of which is optionally substituted. In some embodiments, R ^7’ is selected from hydrogen. In some

embodiments, n is 0 and R ^7’ is selected from hydrogen.

[00105] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected from C3-6 carbocycle and 5- to 9-membered heterocycle, any of which is optionally substituted. In some embodiments, R ^7’ is an optionally substituted C _3-6 carbocycle. In some embodiments, R ^7’ is selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, optionally substituted cyclopentyl, and optionally substituted cyclohexyl. In some embodiments, R ^7’ is selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, and optionally substituted phenyl. In some embodiments, R ^7’ is optionally substituted cyclopropyl. In some embodiments, R ^7’ is optionally substituted cyclobutyl. In some embodiments, R ^7’ is optionally substituted phenyl.

[00106] In some embodiments, for a compound or salt of Formula (I) or (IA), n is 0 and R ^7’ is an optionally substituted C3-6 carbocycle. In some embodiments, n is 1 and R ^7’ is an optionally substituted C _3-6 carbocycle. In some embodiments, n is 0 and R ^7’ is selected from an optionally substituted cyclopropyl, optionally substituted cyclobutyl, and optionally substituted phenyl. In some embodiments, n is 1 and R ^7’ is selected from an optionally substituted cyclopropyl, optionally substituted cyclobutyl, and optionally substituted phenyl.

[00107] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is an optionally substituted cyclopropyl. In some embodiments, n is 0 and R ^7’ is an optionally substituted cyclopropyl. In some embodiments, R ^7’ is cyclopropyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , and -CN. In some embodiments, each R ¹² is independently selected from hydrogen and C1-3 alkyl. In some embodiments, n is 1 and R ^7’ is an optionally substituted cyclopropyl. In some embodiments, n is 0 and the optionally substituted cyclopropyl of R ^7’ is . In some embodiments, n is 1 and

the optionally substituted cyclopropyl of -L-R ^7’ is .

[00108] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is an optionally substituted cyclobutyl. In some embodiments, R ^7’ is cyclobutyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , and -CN. In some embodiments, each R ¹² is independently selected from hydrogen and C1-3 alkyl. In some embodiments, n is 0 and R ^7’ is an optionally substituted cyclobutyl. In some embodiments, n is 1 and R ^7’ is an optionally substituted cyclobutyl. In some embodiments, n is 0 and the optionally substituted cyclobutyl of R ^7’ is . In some embodiments, n is 1 and the

optionally substituted cyclobutyl of -L-R ^7’ is .

[00109] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected from an unsubstituted cyclopropyl, unsubstituted cyclobutyl, and unsubstituted phenyl. In some embodiments, n is 0 and R ^7’ is selected from an unsubstituted cyclopropyl, unsubstituted cyclobutyl, and unsubstituted phenyl. In some embodiments, n is 1 and R ^7’ is selected from an unsubstituted cyclopropyl, unsubstituted cyclobutyl, and unsubstituted phenyl.

[00110] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is an unsubstituted cyclopropyl. In some embodiments, n is 0 and R ^7’ is an unsubstituted cyclopropyl. In some embodiments, n is 1 and R ^7’ is an unsubstituted cyclopropyl. In some embodiments, n is 0 and the unsubstituted cyclopropyl of R ^7’ is . In some embodiments, n is 1 and the

unsubstituted cyclopropyl of -L-R ^7’ is .

[00111] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is an unsubstituted cyclobutyl. In some embodiments, n is 0 and R ^7’ is an unsubstituted cyclobutyl. In some embodiments, n is 1 and R ^7’ is an unsubstituted cyclobutyl. In some embodiments, n is 0 and the unsubstituted cyclobutyl of R ^7’ is . In some embodiments, n is 1 and the

unsubstituted cyclobutyl of -L-R ^7’ is .

[00112] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected from unsubstituted phenyl. In some embodiments, n is 0 and R ^7’ is an unsubstituted phenyl. In some embodiments, n is 0 and the unsubstituted phenyl of R ^7’ is . In some

embodiments, n is 1 and R ^7’ is an unsubstituted phenyl. In some embodiments, n is 1 and the

unsubstituted phenyl of -L-R ^7’ is

[00113] In some embodiments, for a compound or salt of Formula (I) or (IA), n is 0 and R ^7’ is selected from

[00114] In some embodiments, for a compound or salt of Formula (I) or (IA), n is 1 and -L-

R ^7’ is selected from

[00115] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is an optionally substituted phenyl. In some embodiments, n is 0 and R ^7’ is an optionally substituted phenyl. In some embodiments, the substituents on the optionally substituted phenyl of R ^7’ are each independently selected at each occurrence from halogen, -OR ¹² , -SR ¹² , -N(R ¹² ) ₂ , -NO ₂ , -CN, and C _1-6 alkyl, wherein the C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , and -CN. In some embodiments, the substituents on the optionally substituted phenyl of R ^7’ are each independently selected at each occurrence from halogen, -OR ¹² , and -SR ¹² . In some embodiments, the phenyl of R ^7’ is optionally substituted with one substituent selected from halogen, -OR ¹² , and -SR ¹² . In some embodiments, R ¹² of -OR ¹² of phenyl is selected from hydrogen and C1-3 alkyl, and R ¹² of -SR ¹² of phenyl is selected from hydrogen and C _1-3 alkyl. In some embodiments, R ¹² of -OR ¹² of phenyl is selected from C _1-3 alkyl, and R ¹² of -SR ¹² of phenyl is selected from C _1-3 alkyl.

[00116] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected from phenyl substituted with one or more halogens. In some embodiments, n is 0 and R ^7’ is selected from phenyl substituted with one or more halogens. In some embodiments, n is 0 and R ^7’ is selected from phenyl substituted with one or more fluorine atoms. In some embodiments, n is 0 and R ^7’ is selected from phenyl substituted with one or two fluorine atoms. In some

embodiments, n is 0 and R ^7’ is selected from , , In some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is

. In some embodiments, n is 0 and R ^7’ is

[00117] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected from phenyl optionally substituted with one or more -OR ¹² _, wherein R ¹² is independently selected at each occurrence from hydrogen and C1-3 alkyl. In some embodiments, n is 0 and R ^7’ is selected from phenyl optionally substituted with one or more -OR ¹² , wherein R ¹² is

independently selected at each occurrence from hydrogen and C _1-3 alkyl. In some embodiments, n is 0 and R ^7’ is selected from phenyl optionally substituted with one or more -OR ¹² , wherein R ¹² is independently selected at each occurrence from C1-3 alkyl. In some embodiments, n is 0 and R ^7’ is selected from phenyl optionally substituted with one or more -SR ¹² _, wherein R ¹² is independently selected at each occurrence from C _1-3 alkyl. In some embodiments, n is 0 and R ^7’

is selected from In some embodiments, n is 0 and R ^7’ is

. In some embodiments, n is 0 and R ^7’ is In some embodiments, n is

0 and R ^7’ is selected from, and

[00118] In some embodiments, for a compound or salt of Formula (I) or (IA), n is 0, R ^7’ is

selected from,

and when n is 1, -L-R ^7’ is selected from

[00119] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected from an optionally substituted 5- to 6-membered heterocycle. In some embodiments, R ^7’ is selected from an unsubstituted 5- to 6-membered heterocycle. In some embodiments, R ^7’ is selected from a saturated 5- to 6-membered heterocycle. In some embodiments, R ^7’ is selected from an unsaturated 5- to 6-membered heterocycle. In some embodiments, R ^7’ is selected from an aromatic 5- to 6-membered heterocycle. In some embodiments, R ^7’ is selected from non- aromatic 5- to 6-membered heterocycle. In some embodiments, the optionally substituted 5- to 6-membered heterocycle of R ^7’ comprises at least one heteroatom selected from N and O. In some embodiments, the optionally substituted 5- to 6-membered heterocycle of R ^7’ comprises one or two nitrogen atoms. In some embodiments, R ^7’ is selected from an optionally substituted 6-membered heterocycle comprising at least one heteroatom selected from O. In some embodiments, R ^7’ is selected from an optionally substituted 6-membered heterocycle comprising at least one heteroatom selected from N. In some embodiments, R ^7’ is selected from a 6- membered heterocycle comprising at least one heteroatom selected from N.

[00120] In some embodiments, for a compound or salt of Formula (I) or (IA), the 6-membered heterocycle of R ^7’ is a 6-membered heteroaryl. In some embodiments, R ^7’ is selected from a 6- membered heteroaryl optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -N(R ¹² ) ₂ , -NO ₂ , -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, R ^7’ is selected from a 6-membered heteroaryl optionally substituted with one or more

substituents independently selected from -OR ¹² , wherein R ¹² is independently selected from hydrogen and C _1-6 alkyl. In some embodiments R ¹² of -OR ¹² is independently selected from C _1-6 alkyl. In some embodiments, R ¹² of -OR ¹² is C1 alkyl. In some embodiments, n is 1 and L is selected from C _1-3 alkylene optionally substituted with one or more substituents selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , and -CN. In some embodiments, R ¹² of -OR ¹² is C1 alkyl. In some embodiments, n is 1 and L is selected from C1-3 alkylene. In some embodiments, n is 0

and R ^7’

. In some embodiments, R ^7’ is selected from an unsubstituted 6- membered heteroaryl. In some embodiments, n is 0 and R ^7’ is selected from

, , , a d . In some embodiments, n is 0 and R ^7’ is selected from In some embodiments, n is 0 and R ^7’ is , , . In some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is

[00121] In some embodiments, for a compound or salt of Formula (I) or (IA), R ^7’ is selected

from

[00122] In some embodiments, for a compound or salt of Formula (I) or (IA), when n is 0, R ^7’

is selected from , , , , , ; and when n is 1, -

L-R ^7’ is selected from , ,

[00123] In some embodiments, for a compound or salt of Formula (I) or (IA), n is 0 and R ^7’ is

selected from , , , , , , , , , , , , , , and when n is 1, -L-R ^7’ is selected from

[00124] In some embodiments, for a compound or salt of Formula (I) or (IA), n is 0, R ^7’ is

selected from , , , , , , , , , , ; and when n is 1, -L-R ^7’ is selected from

and

[00125] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -CN, and -NO ₂ . In some embodiments, for a compound or salt of Formula (I), R ⁸ is selected from hydrogen, halogen, and optionally substituted C _1-3 alkyl with one or more substituents independently selected from halogen, -OR ¹⁰ , -CN, and -NO ₂ . In some embodiments, R ⁸ is selected from hydrogen, halogen, methyl, ethyl, and propyl. In some embodiments, R ⁸ is selected from hydrogen, halogen, and methyl. In some embodiments, R ⁸ is selected from hydrogen and methyl. In some embodiments, R ⁸ is selected from hydrogen.

[00126] In some embodiments, for a compound or salt of Formula (I) or (IA), R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH2, C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle.

[00127] In some embodiments, for a compound or salt of Formula (I) or (IA), R ¹⁰ is independently selected from hydrogen; and C1-3 alkyl, C3-6 carbocycle, and 3- to 6-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH2, C _1-6 alkyl, -C _1-6 haloalkyl, -O-C _1-6 alkyl, C3-6 carbocycle, and 3- to 6-membered heterocycle. In some embodiments, R ¹⁰ is independently selected from hydrogen and C _1-3 alkyl, wherein C _1-3 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OH, -NH ₂ , -NO ₂ , and -CN.

[00128] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected

from: and

(L) _n –R ^7’ is selected from:

, , , , , ,

[00129] In some embodiments, for a compound or salt of Formula (I) or (IA), X is C(H); R ¹ is

O; R ³ and R ⁴ are each independently -OH; R ⁵ is -C(O)N(H)(Me); R ⁶ is selected from

selected from: [00130] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected

from:

[00131] In some embodiments, for a compound or salt of Formula (I) or (IA), X is C(H); R ¹ is O; R ³ and R ⁴ are each independently -OH; R ⁵ is -C(O)N(H)(Me); R ⁶ is selected from optionally substituted C3-6 carbocycle and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, optionally substituted C _3-6 carbocycle, and optionally substituted 3- to 6-membered heterocycle; R ^7’ is selected from optionally substituted heteroaryl and optionally substituted C3-C6 carbocycle, or R ^7’ is selected from optionally substituted C1-3 alkyl, n is 0, and R ⁸ is hydrogen.

[00132] In some embodiments, for a compound or salt of Formula (I) or (IA), X is C(H); R ¹ is O; R ³ and R ⁴ are each independently -OH; R ⁵ is -C(O)N(H)(Me); R ⁶ is selected from:

[00133] In some embodiments, for a compound or salt of Formula (I) or (IA), X is N; R ¹ is O; R ³ and R ⁴ are each independently -OH; R ⁵ is -C(O)N(H)(Me); R ⁶ is selected from:

selected from: and ; and R ⁸ is hydrogen.

[00134] In some embodiments, for a compound or salt of Formula (I) or (IA), R ⁶ is selected

from: and (L) _n –R ^7’ is selected from: and

[00135] In some embodiments, for a compound or salt of Formula (I) or (IA), X is C(H); R ¹ is O; R ³ and R ⁴ are each independently -OH; R ⁵ is -C(O)N(H)(Me); R ⁶ is selected from:

(L)n–R ^7’ is selected from: ; and R ⁸ is hydrogen.

[00136] In some embodiments, for a compound or salt of Formula (I) or (IA), X is N; R ¹ is O; R ³ and R ⁴ are each independently -OH; R ⁵ is -C(O)N(H)(Me); R ⁶ is selected from: , (L)n–R ^7’ is selected from: ; and R ⁸ is

hydrogen.

[00137] In some embodiments, the compound or salt of Formula (I) or (IA) is represented by:

, , , , , , ,

, ,

.

[00138] In certain embodiments, the disclosure provides a compound represented by Formula (II):

or a salt thereof, wherein:

X is selected from N and C(H);

R ¹ is selected from O and S;

R ³ and R ⁴ are independently selected from hydrogen, -OH, and -NH2;

R ⁵ is selected from is selected from -C(O)N(H)(R ¹¹ );

R ⁶ is selected from: hydrogen and -OR ¹⁰ ; and

C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ ,

-C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C3- 1 ₂ carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl;

L is selected from C1-C3 alkylene, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

R ⁷ is independently selected from hydrogen; and C _3-12 carbocycle and 3- to 12- membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , - N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, wherein C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl are optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), and -CN;

R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH2, C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _2-10 alkenyl, C _2-10 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle;

R ¹¹ is selected from hydrogen; and methyl, C3-C6 alkyl, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN; and ethyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹² is independently selected from hydrogen; and C1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , and -NH2; and

n is 0 or 1.

[00139] In certain embodiments, for a compound or salt of Formula (II), R ¹ is O.

[00140] In certain embodiments, for a compound or salt of Formula (II), X is C(H).

[00141] In certain embodiments, for a compound or salt of Formula (II), X is N.

[00142] In certain embodiments, for a compound or salt of Formula (II), R ³ and R ⁴ are each OH.

[00143] In certain embodiments, for a compound or salt of Formula (II), R ¹¹ is selected from hydrogen and methyl.

[00144] In certain embodiments, for a compound or salt of Formula (II), R ¹¹ is methyl.

[00145] In certain embodiments, for a compound or salt of Formula (II), n is 1 and L is methylene.

[00146] In certain embodiments, for a compound or salt of Formula (II), n is 0.

[00147] In certain embodiments, for a compound or salt of Formula (II), R ⁷ is selected from hydrogen; and C ₅ -6 carbocycle and 5- to 9-membered heterocycle, wherein each of which is optionally substituted.

[00148] In certain embodiments, for a compound or salt of Formula (II), R ⁷ is selected from hydrogen, optionally substituted phenyl, and optionally substituted heteroaryl.

[00149] In certain embodiments, for a compound or salt of Formula (II), R ⁷ is selected from optionally substituted phenyl and optionally substituted 5-membered heteroaryl.

[00150] In certain embodiments, for a compound or salt of Formula (II), R ⁷ is an optionally substituted 5-membered heteroaryl.

[00151] In certain embodiments, for a compound or salt of Formula (II), substituents on R ⁷ are independently selected at each occurrence from halogen, -OH, -NH ₂ , -NO ₂ , -CN, and C _1-3 alkyl, wherein C1-3 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OH, -NH2, -NO ₂ , and -CN.

[00152] In certain embodiments, for a compound or salt of Formula (II), R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN and 3- to 8-membered heterocycle, wherein 3- to 8- membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , -CN, C _1-3 alkyl, and C _1-3 haloalkyl.

[00153] In certain embodiments, for a compound or salt of Formula (II), R ⁶ is selected from methyl, ethyl, and propyl, any one of which is optionally substituted. In certain embodiments, for a compound or salt of Formula (I), R ⁶ is selected from methyl, ethyl, and propyl.

[00154] In certain embodiments, for a compound or salt of Formula (II), R ⁸ is hydrogen.

[00155] In certain embodiments, for a compound or salt of Formula (II), each R ¹⁰ is independently selected from hydrogen and C _1-3 alkyl, wherein C _1-3 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OH, -NH ₂ , -NO ₂ , and -CN.

[00156] In certain embodiments, a compound of Formula (II) is represented by:

salt of any one thereof.

[00157] In some aspects, the disclosure provides a compound represented by Formula (III):

or a salt thereof, wherein:

X is selected from N and C(H);

R ¹ is selected from O, S, and CH(R ²¹ );

R ³ and R ⁴ are independently selected from hydrogen, -OH, and -NH2;

R ⁵ is selected from -CH ₂ OH and -C(O)N(H)(R ¹¹ );

R ²² is selected from hydrogen when R ¹ is selected from O and S; or when R ¹ is CH(R ²¹ ), R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle;

R ⁶ is selected from:

hydrogen and -OR ¹⁰ ; and C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C3- 12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl;

L is selected from C1-C3 alkylene, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

R ^7’ is independently selected from C _3-12 carbocycle and 3- to 12-membered heterocycle; and when n is 0, R ^7’ is further selected from hydrogen, optionally substituted C _1-6 alkyl, optionally substituted C _2-6 alkenyl, and optionally substituted C _2-6 alkynyl;

wherein the C _3-12 carbocycle and 3- to 12-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -C(O)R ¹² , -C(O)OR ¹² , - OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and wherein when R ⁵ is -CH2OH and -L-R ^7’ is benzyl, the benzyl is substituted with one or more substituents independently selected from -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , - N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

wherein the C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , - N(R ¹² ) ₂ , -S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN;

R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH2, C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _2-10 alkenyl, C _2-10 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle; and

R ¹¹ is selected from hydrogen; and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹² is independently selected from hydrogen; and C1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , and -NH2;

R ¹³ is selected from hydrogen; and

C ₁ - ₆ alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , - C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl; and

n is 0 or 1.

[00158] In some embodiments, Formula (III) is represented by Formula (IIIA)

salt thereof.

[00159] In some embodiments, for a compound or salt of Formula (III) or (IIIA), R ²² is selected from hydrogen when R ¹ is selected from O and S; or when R ¹ is C(R ²¹ ) ₂ , R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle. In some embodiments, each R ²¹ is hydrogen, or R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle and the other R ²¹ is hydrogen. [00160] In some embodiments, Formula (III) is represented by Formula (IIIB)

salt thereof.

[00161] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), X is C(H). In some embodiments, X is N.

[00162] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ³ and R ⁴ are independently selected from hydrogen and -OH. In some embodiments, R ³ and R ⁴ are independently selected from hydrogen and -NH2. In some embodiments, R ³ and R ⁴ are independently selected from -OH and -NH2. In some embodiments, R ³ and R ⁴ are each selected from two different substituents, for example, R ³ is hydrogen and R ⁴ is -OH. In some

embodiments, R ³ and R ⁴ are each selected from the same substituent, for example, R ³ is hydrogen and R ⁴ is hydrogen.

[00163] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁵ is C(O)N(H)(R ¹¹ ). In some embodiments, R ⁵ is -CH ₂ OH.

[00164] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁵ is C(O)N(H)(R ¹¹ ) and R ¹¹ is selected from hydrogen; C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, and -CN. In some embodiments, R ¹¹ is selected from hydrogen and C _1-6 alkyl. In some embodiments, R ¹¹ is selected from C _1-6 alkyl. In some embodiments, R ⁵ is C(O)N(H)(Me).

[00165] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), L is selected from C ₁ -C ₃ alkylene optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, and -CN. In some embodiments, L is selected from C1-C3 alkylene optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -NO ₂ , and -CN. In some embodiments, each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle. In some embodiments, each R ¹⁰ is

independently selected from hydrogen and C _1-6 alkyl. In some embodiments, L is selected from C1-C3 alkylene optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , and -CN. In some embodiments, L is selected from unsubstituted C1-C3 alkylene. In some embodiments, n is 1 and L is selected from methylene, ethylene, and propylene any of which is optionally substituted. In some embodiments, n is 1 and L is selected from methylene, ethylene, and propylene. In some embodiments, n is 1 and L is optionally substituted methylene. In some embodiments, n is 1 and L is methylene. In some embodiments, n is 1 and L is optionally substituted ethylene. In some embodiments, n is 1 and L is ethylene. In some embodiments, n is 1 and L is optionally substituted propylene. In some embodiments, n is 1 and L is propylene. In some embodiments, n is 0

[00166] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁸ is hydrogen. In some embodiments, R ⁸ is halogen. In some embodiments, R ⁸ is C1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , and -CN. In some embodiments, R ⁸ is C _1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , and -CN. In some embodiments, R ⁸ is unsubstituted C1-3 alkyl.

[00167] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ¹³ is hydrogen. In some embodiments, R ¹³ is selected from optionally substituted C _1-6 alkyl. In some embodiments, R ¹³ is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl any one of which is optionally substituted. In some embodiments, R ¹³ is selected from C ₁ - ₆ alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , - N(R ¹⁰ ) ₂ , -NO ₂ , =O, =S, and -CN. In some embodiments, R ¹³ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, and -CN. In some embodiments, R ¹³ is selected from C ₁ - ₃ alkyl optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, and -CN. In some embodiments, R ¹³ is selected from C _1-6 alkyl. In some embodiments, R ¹³ is selected from C ₁ - ₃ alkyl. In some embodiments, R ¹³ is methyl.

[00168] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from -OR ¹⁰ ; optionally substituted C _1-6 alkyl, optionally substituted C3-6 carbocycle, and optionally substituted 3- to 6-membered heterocycle.

[00169] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁵ is -CH2OH, R ⁶ is selected from:

hydrogen and -OR ¹⁰ ; and

C _2-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C _3- 12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

C ₁ alkyl is substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12- membered heterocycle, wherein C _3-12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , - C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl.

[00170] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁵ is -CH2OH, R ⁶ is selected from:

-OR ¹⁰ ; and

C _2-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , - C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C _3-12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , - N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

C1 alkyl is substituted with one or more substituents independently selected from C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C _3-12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , - N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-6 carbocycle and 3- to 6-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl.

[00171] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁵ is -CH2OH, R ⁶ is selected from:

-OR ¹⁰ ; and

C _2-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, and -CN;

C1 alkyl is substituted with one or more substituents independently selected and 3- to 5-membered heterocycle, wherein the 3- to 5-membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, -CN, C _1-6 alkyl, C _1-6 haloalkyl; and

C3-6 carbocycle and 3- to 6-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl.

[00172] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁵ is -CH2OH, R ⁶ is selected from optionally substituted C _2-6 alkyl. In some embodiments, R ⁵ is - CH ₂ OH, R ⁶ is selected from ethyl, propyl, butyl, pentyl, and hexyl, any of which is optionally substituted.

[00173] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from -OR ¹⁰ ; optionally substituted C _1-6 alkyl, optionally substituted C3-6 carbocycle, and optionally substituted 3- to 6-membered heterocycle.

[00174] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is an optionally substituted C _1-6 alkyl. In some embodiments, R ⁶ is selected from optionally substituted C _1-2 alkyl, optionally substituted C _1-3 alkyl, optionally substituted C _1-4 alkyl, and optionally substituted C1-5 alkyl. In some embodiments, R ⁶ is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl, any of which is optionally substituted. In some embodiments, R ⁶ is selected from methyl, ethyl, and propyl, any of which is optionally substituted. In some embodiments, C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle. In some embodiments, C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen, - OR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -NO ₂ , =O, and -CN. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl. [00175] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is an optionally substituted C3-8 carbocycle, wherein the optionally substituted C3-8 carbocycle is selected from optionally substituted C _3-4 carbocycle, optionally substituted C _3-5 carbocycle, optionally substituted C3-6 carbocycle, and optionally substituted C3-7 carbocycle. In some embodiments, the optionally substituted C3-8 carbocycle of R ⁶ is saturated. In some

embodiments, the optionally substituted C _3-8 carbocycle of R ⁶ is unsaturated. In some embodiments, the optionally substituted C3-8 carbocycle of R ⁶ is aromatic. In some

embodiments, the optionally substituted C3-8 carbocycle of R ⁶ is selected from cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and phenyl. In some embodiments, the optionally substituted C _3-8 carbocycle of R ⁶ is selected from cyclopropyl, cyclobutyl, and phenyl. In some embodiments, C3-6 carbocycle is optionally substituted with one or more substituents

independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, C _3-6 carbocycle is optionally substituted with one or more substituents independently selected from halogen, - OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl.

[00176] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is an optionally substituted 3- to 8-membered heterocycle, wherein the optionally substituted 3- to 8-membered heterocycle is selected from optionally substituted 3- to 4-membered heterocycle, optionally substituted 3- to 5-membered heterocycle, optionally substituted 3- to 6-membered heterocycle, and optionally substituted 3- to 7-membered heterocycle. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ is saturated. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ is unsaturated. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ is aromatic. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen, oxygen, sulfur, and any combination thereof. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen, oxygen, and any combination thereof. In some embodiments, the 3- to 8- membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen. In some embodiments, the 3- to 8-membered heterocycle of R ⁶ comprises at least one heteroatom selected from oxygen. In some embodiments, the 3- to 6-membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ ,

-C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, the 3- to 6-membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, the 4-membered heterocycle is optionally substituted with one or more substituents independently selected from C _1-6 alkyl and C _1-6 haloalkyl. In some embodiments, the 4-membered heterocycle is substituted with one or more substituents independently selected from C _1-6 alkyl. In some embodiments, the 4-membered heterocycle is saturated. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl.

[00177] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from: hydrogen and -OR ¹⁰ ; and C1 alkyl substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C _3-12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, - OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

C _2-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C _3-12 carbocycle, and 3- to 12- membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl.

[00178] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from: -OR ¹⁰ ; and C1 alkyl is substituted with one or more substituents independently selected from C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C _3-12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , - N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

C _2-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C _3-12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-6 carbocycle and 3- to 6-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _1-6 haloalkyl, C _2-6 alkenyl, and C _2-6 alkynyl.

[00179] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from: -OR ¹⁰ ; and C1 alkyl is substituted with one or more substituents independently selected and 3- to 5-membered heterocycle, wherein the 3- to 5-membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, -CN, C _1-6 alkyl, C _1-6 haloalkyl;

C _2-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, and -CN; and

C3-6 carbocycle and 3- to 6-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl.

[00180] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from -OR ¹⁰ ; C _1-6 alkyl optionally substituted with one or more substituents

independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C3-6 carbocycle, and 3- to 6-membered heterocycle, wherein C _3-6 carbocycle, and 3- to 6-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

optionally substituted C _3-6 carbocycle, and optionally substituted 3- to 6-membered heterocycle each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl.

[00181] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from -OR ¹⁰ ; C _1-6 alkyl optionally substituted with one or more substituents

independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C3-6 carbocycle, and 3- to 6-membered heterocycle, wherein C3-6 carbocycle, and 3- to 6-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

optionally substituted C _3-6 carbocycle, and optionally substituted 3- to 5-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl.

[00182] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from -OR ¹⁰ wherein R ¹⁰ is selected from C1-3 alkyl; C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen and 3- to 5-membered

heterocycle, wherein the 3- to 5-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, wherein R ¹⁰ is selected from C1-3 alkyl; and optionally substituted cyclopropyl, optionally substituted cyclobutyl, and optionally substituted 3- to 5-membered heterocycle, wherein the 3- to 5-membered heterocycle comprises at least one heteroatom selected from oxygen and nitrogen, any of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , - NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl, wherein R ¹⁰ is selected from C _1-3 alkyl.

[00183] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from -OR ¹⁰ wherein R ¹⁰ is selected from C1-3 alkyl; C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen and 5-membered heteroaryl, wherein the 5-membered heteroaryl is optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, C _1-6 alkyl;

optionally substituted cyclopropyl, optionally substituted cyclobutyl, optionally substituted azetidine, any of which is optionally substituted with one or more substituents independently selected from halogen, C _1-6 alkyl, and C _1-6 haloalkyl.

[00184] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, 5- to 6-membered heteroaryl, wherein the 5- to 6- membered heteroaryl are optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, and C _1-6 alkyl;

C _3-6 carbocycle optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl.

[00185] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen; optionally substituted cyclopropyl and optionally substituted cyclobutyl, any of which is optionally substituted with one or more substituents independently selected from halogen, C _1-6 alkyl, and C _1-6 haloalkyl.

[00186] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from unsubstituted C _1-6 alkyl; C _1-6 alkyl substituted with one or more substituents independently selected from halogen; and unsubstituted cyclopropyl and unsubstituted cyclobutyl.

[00187] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is -OR ¹⁰ . In some embodiments, R ⁶ is -OR ¹⁰ and R ¹⁰ is selected from hydrogen, C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle. In some

embodiments R ⁶ is -OR ¹⁰ and R ¹⁰ is selected from hydrogen and C _1-6 alkyl. In some

embodiments, R ⁶ is -OH. In some embodiments, R ⁶ is -OR ¹⁰ and R ¹⁰ is selected from C _1-6 alkyl. In some embodiments, R ¹⁰ of -OR ¹⁰ is selected from C _1-3 alkyl. In some embodiments, R ¹⁰ of -

OR ¹⁰ is selected from methyl, ethyl, and propyl. In some embodiments, R ⁶ is

[00188] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN; and 3- to 8-membered heterocycle, wherein 3- to 8-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , -CN, C1-3 alkyl, and C1-3 haloalkyl. In some embodiments, R ⁶ is selected from unsubstituted C _1-6 alkyl. In some embodiments, R ⁶ is selected from C _1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, optionally substituted C3-6 carbocycle, and optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from

unsubstituted C _1-3 alkyl. In some embodiments, R ⁶ is selected from unsubstituted methyl, ethyl, and propyl. In some embodiments, R ⁶ is selected from methyl, ethyl, and propyl, any one of

which is optionally substituted. In some embodiments, R ⁶ is selected from .

In some embodiments, R ⁶ is . In some embodiments, R ⁶ is .

[00189] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, -CN, and optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen and optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen and optionally substituted 3- to 6- membered heterocycle. In some embodiments, R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen. In some embodiments, R ⁶ is selected from C _1-6 alkyl substituted with one or more substituents

independently selected from fluorine. In some embodiments, R ⁶ is C _1-3 alkyl optionally substituted with one or more substituents independently selected from fluorine, chlorine, and bromine. In some embodiments, R ⁶ is C1-3 alkyl substituted with one, two, or three halogen atoms. In some embodiments, R ⁶ is C1-3 alkyl substituted with two halogen atoms. In some embodiments, R ⁶ is C _1-3 alkyl substituted with one or more substituents selected from fluorine. In some embodiments, R ⁶ is C2-3 alkyl substituted with one or more substituents selected from fluorine. In some embodiments, R ⁶ is C1-3 alkyl substituted with one, two, or three fluorine atoms. In some embodiments, R ⁶ is C _1-3 alkyl substituted with two fluorine atoms. In some

embodiments, R ⁶ is selected from . some embodiments, R ⁶ is . In

some embodiments, .

[00190] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from C _1-6 alkyl substituted with one or more substituents independently selected from optionally substituted 3- to 6-membered heterocycle. In some embodiments, the optionally substituted 3- to 6-membered heterocycle comprises at least one heteroatom selected from nitrogen, oxygen, sulfur, and any combination thereof. In some embodiments, the optionally substituted 3- to 6-membered heterocycle comprises at least one heteroatom selected from nitrogen, oxygen, and any combination thereof. In some embodiments, the optionally substituted 3- to 6-membered heterocycle is aromatic. In some embodiments, the optionally substituted 3- to 6-membered heterocycle is non-aromatic. In some embodiments, the optionally substituted 3- to 6-membered heterocycle is saturated. In some embodiments, the optionally substituted 3- to 6- membered heterocycle is unsaturated. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with one or more substituents independently selected from optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with an optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 3-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with optionally substituted 4-membered heterocycle. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 5-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from optionally substituted 5- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-6 alkyl substituted with one or more substituents independently selected from 5-membered heteroaryl. In some embodiments, R ⁶ is selected from C _1-6 alkyl substituted with an optionally substituted 5- membered heteroaryl. In some embodiments, the 5-membered heteroaryl on C _1-6 alkyl of R ⁶ is isoxazole, wherein the isoxazole is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, and C _1-6 alkyl.

[00191] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 5-membered heterocycle, wherein the 5-membered heterocycle comprises at least one heteroatom selected from nitrogen, oxygen, sulfur, and any combination thereof. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with optionally substituted 5-membered heterocycle, wherein the 5-membered heterocycle comprises at least one heteroatom selected from nitrogen, oxygen, and any combination thereof. In some embodiments, R ⁶ is selected from C _1-3 alkyl substituted with optionally substituted 5-membered heterocycle, wherein the 5-membered heterocycle comprises at least one heteroatom selected from nitrogen. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted 5-membered heterocycle, wherein the 5-membered heterocycle comprises at least one heteroatom selected from oxygen. In some embodiments, R ⁶ is selected from C1-3 alkyl substituted with optionally substituted isoxazole. In some

embodiments, R ⁶ is selected from C1-3 alkyl substituted with isoxazole, wherein the isoxazole is substituted with one or more substituents selected from C _1-6 alkyl. In some embodiments, R ⁶ is

.

[00192] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from optionally substituted C _3-6 carbocycle and optionally substituted 3- to 6-membered heterocycle.

[00193] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is selected from optionally substituted C _3-6 carbocycle. In some embodiments, the optionally substituted C3-6 carbocycle of R ⁶ is saturated. In some embodiments, the optionally substituted C3-6 carbocycle of R ⁶ is unsaturated. In some embodiments, the optionally substituted C3-6 carbocycle of R ⁶ is aromatic. In some embodiments, R ⁶ is unsubstituted C _3-6 carbocycle. In some embodiments, R ⁶ is C3-6 carbocycle optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl. In some embodiments, R ⁶ is C _3-6 carbocycle optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl.

[00194] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), the optionally substituted C _3-6 carbocycle of R ⁶ is selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, optionally substituted cyclopentyl, optionally substituted cyclohexyl and optionally substituted phenyl. In some embodiments, R ⁶ is selected from cyclopropyl, cyclobutyl, and phenyl, any of which is optionally substituted with one or more substituents independently selected halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, C _1-6 haloalkyl, C _1-6 alkyl, and -CN. In some embodiments, R ⁶ is selected from selected from, cyclopropyl and cyclobutyl, any of which is optionally substituted with one or more substituents independently selected halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , C _1-6 haloalkyl, C _1-6 alkyl, and -CN, wherein each R ¹⁰ is independently selected from C _1-6 alkyl. In some embodiments, R ⁶ is cyclopropyl optionally substituted with one or more substituents independently selected halogen, -NO ₂ , C _1-6 haloalkyl, C _1-6 alkyl, and -CN. In some embodiments, R ⁶ is cyclobutyl optionally substituted with one or more substituents independently selected halogen, -NO ₂ , C _1-6 haloalkyl, C _1-6 alkyl, and -CN. In some embodiments, R ⁶ is selected from . In some embodiments, R ⁶ is In some embodiments, R ⁶ is

[00195] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is a 3- to 6-membered heterocycle is optionally substituted with one or more substituents independently selected from C _1-6 alkyl. In some embodiments, R ⁶ is a 3- to 6-membered heterocycle is optionally substituted with one or more substituents independently selected from C1-3 alkyl. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ is saturated. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ is unsaturated. In some embodiments, the optionally substituted 3- to 6-membered heterocycle of R ⁶ is aromatic. In some embodiments, the optionally substituted 3- to 6-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen, oxygen, sulfur, or any combination thereof. In some embodiments, the optionally substituted 3- to 6-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen, oxygen, or any combination thereof. In some embodiments, the optionally substituted 3- to 6-membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen and oxygen. In some embodiments, the optionally substituted 3- to 6- membered heterocycle of R ⁶ comprises at least one heteroatom selected from nitrogen. In some embodiments, the optionally substituted 3- to 6-membered heterocycle of R ⁶ comprises at least one heteroatom selected from oxygen. In some embodiments, the optionally substituted 3- to 6- membered heterocycle of R ⁶ is selected from optionally substituted 3-membered heterocycle, optionally substituted 4-membered heterocycle, optionally substituted 5-membered heterocycle and optionally substituted 6-membered heterocycle. In some embodiments, the optionally substituted 3- to 6-membered heterocycle of R ⁶ is a 4-membered heterocycle. In some embodiments, the optionally substituted 4-membered heterocycle of R ⁶ is saturated.

[00196] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is 3- to 6-membered heterocycle, which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, -CN, C _1-6 alkyl, C _1-6 haloalkyl. In some embodiments, R ⁶ is 4- to 5-membered heterocycle, which is optionally substituted with one or more substituents independently selected from C _1-6 alkyl. In some embodiments, R ⁶ is selected from optionally substituted azetidine. In some embodiments, R ⁶ is selected from .

[00197] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ⁶ is

selected from ,

and In some embodiments, R ⁶ is selected from

In some embodiments, R ⁶ is selected from

In some embodiments, R ⁶ is selected

from

[00198] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is selected from hydrogen, optionally substituted C _1-6 alkyl, optionally substituted C _2-6 alkenyl, and optionally substituted C _3-12 carbocycle.

[00199] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is selected from hydrogen; and C _5-6 carbocycle and 5- to 9-membered heterocycle, wherein each of which is optionally substituted. In some embodiments, R ^7’ is selected from hydrogen, optionally substituted phenyl, and optionally substituted heteroaryl.

[00200] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is hydrogen.

[00201] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7' is C _1-6 alkyl which is optionally substituted. In some embodiments, R ^7' is C _1-6 alkyl which is substituted. In some embodiments, R ^7' is C _1-6 alkyl which is unsubstituted. In some

embodiments, R ^7' is selected from C1-2 alkyl, C1-3 alkyl, C1-4 alkyl, and C1-5 alkyl, any of which is optionally substituted. In some embodiments, C _1-6 alkyl of R ^7' is selected from C1 alkyl, C2 alkyl, C ₃ alkyl, C ₄ alkyl, C ₅ alkyl, and C ₆ alkyl any of which is optionally substituted. In some embodiments, C _1-6 alkyl of R ^7' is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl. Any of which is optionally substituted.

[00202] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7' is C _2-6 alkenyl which is optionally substituted. In some embodiments, R ^7' is C _2-6 alkenyl which is substituted. In some embodiments, C _2-6 alkenyl is selected from C2-3 alkenyl, C2-4 alkenyl, and C2-5 alkenyl, each of which is optionally substituted. In some embodiments, C _2-6 alkenyl of R ^7' is selected from C ₂ alkenyl, C ₃ alkenyl, C ₄ alkenyl, C ₅ alkenyl, and C ₆ alkenyl, each of which is optionally substituted. In some embodiments, C _2-6 alkenyl of R ^7' is selected from ethenyl, propenyl, butenyl, pentenyl, and hexenyl.

[00203] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7' is C _3-12 carbocycle which is optionally substituted. In some embodiments, the optionally substituted C _3-12 carbocycle of R ^7' is saturated. In some embodiments, the optionally substituted C _3-12 carbocycle of R ^7' is unsaturated. In some embodiments, the optionally substituted C _3-12 carbocycle of R ^7' is aromatic. In some embodiments, R ^7' is unsubstituted C _3-12 carbocycle. In some embodiments, R ^7' is C3-6 carbocycle which is optionally substituted. In some embodiments, the C3-6 carbocycle of R ^7' is selected from C3 carbocycle, C4 carbocycle, C ₅ carbocycle, and C6 carbocycle any of which is optionally substituted. In some embodiments, R ^7' is C _7-12 carbocycle which is optionally substituted. In some embodiments, the C7-12 carbocycle of R ^7' is selected from C7 carbocycle, C8 carbocycle, C9 carbocycle, C10 carbocycle, C11 carbocycle, and C12 carbocycle any of which is optionally substituted. In some embodiments, the optionally substituted C _3-12 carbocycle of R ^7' is a bicyclic, for example norboranyl, norbornenyl, naphthalyl, decalinyl, or spirodecanyl.

[00204] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7' is 3- to 12-membered heterocycle which is optionally substituted. In some embodiments, R ^7' is 3- to 12-membered heterocycle which is optionally substituted. In some embodiments, the optionally substituted 3- to 12-membered heterocycle of R ^7' is unsubstituted. In some

embodiments, the optionally substituted 3- to 12-membered heterocycle of R ^7' is unsaturated. In some embodiments, the optionally substituted 3- to 12-membered heterocycle of R ^7' is aromatic. In some embodiments, R ^7' is 3- to 6-membered heterocycle. In some embodiments, the 3- to 6- membered heterocycle of R ^7' is selected from 3-membered heterocycle, 4-membered

heterocycle, 5-membered heterocycle, and 6-membered heterocycle any of which is optionally substituted. In some embodiments, R ^7' is 7- to 12-membered heterocycle. In some embodiments, the 7- to 12-membered heterocycle of R ^7' is selected from 7-membered heterocycle, 8-membered heterocycle, 9-membered heterocycle, 10-membered heterocycle, 11-membered heterocycle, and 12-membered heterocycle any of which is optionally substituted.

[00205] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), the optionally substituted 3- to 12-membered heterocycle of R ^7' is an optionally substituted 5- to 6- membered heterocycle. In some embodiments, the optionally substituted 5- to 6-membered heterocycle of R ^7' is selected from pyrrolidine, pyrroline, pyrrole, pyrazolidine, imidazolidine, pyrazoline, imidazoline, pyrazole, imidazole, piperidine, pyridine, piperazine, pyridazine, pyrimidine, and pyrazine. In some embodiments, R ^7' is selected from piperidine, pyridine, piperazine, pyridazine, pyrimidine, and pyrazine any of which is optionally substituted. In some embodiments, R ^7' is selected from pyridine, pyridazine, pyrimidine, and pyrazine any of which is optionally substituted. In some embodiments, R ^7' is optionally substituted pyridine.

[00206] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is independently selected from hydrogen, C _1-6 alkyl, C _2-6 alkenyl, C3-6 carbocycle and 3- to 6- membered heterocycle; wherein the C _3-6 carbocycle and 3- to 6-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, -CN, C _1-6 haloalkyl, and C _1-6 alkyl; and wherein the C _1-6 alkyl and C _2-6 alkenyl are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, and -CN.

[00207] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is independently selected from hydrogen, C _1-6 alkyl, C _2-6 alkenyl, and C3-6 carbocycle; wherein the C3-6 carbocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, -CN, C _1-6 haloalkyl, and C _1-6 alkyl;

and wherein the C _1-6 alkyl and C _2-6 alkenyl are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, and -CN.

[00208] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is independently selected from hydrogen, C _1-6 alkyl, C _2-6 alkenyl, and C _3-6 carbocycle; wherein the C3-6 carbocycle is optionally substituted with one or more substituents independently selected from halogen and -OR ¹² , wherein R ¹² is selected from hydrogen and C1-3 alkyl; and wherein the C _1-6 alkyl and C _2-6 alkenyl are each optionally substituted with one or more substituents independently selected from -OR ¹² , wherein R ¹² is selected from hydrogen and C1-3 alkyl.

[00209] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is independently selected from hydrogen, C _1-6 alkyl, unsubstituted C _2-6 alkenyl, and C _3-6 carbocycle; wherein the C3-6 carbocycle is optionally substituted with one or more substituents independently selected from halogen and -OR ¹² , wherein R ¹² is selected from C1-3 alkyl; and wherein the C _1-6 alkyl is optionally substituted with one or more substituents independently selected from -OR ¹² , wherein R ¹² is selected from C _1-3 alkyl.

[00210] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is an optionally substituted C _1-6 alkyl. In some embodiments, R ^7' is selected from C1-2 alkyl, C1-3 alkyl, C _1-4 alkyl, C _1-5 alkyl, and C _1-6 alkyl, any of which is optionally substituted. In some embodiments, R ^7' is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl. In some embodiments, the C _1-6 alkyl of R ^7’ is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , and -CN.

[00211] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, and -CN. In some embodiments, R ^7’ is C _1-6 alkyl of is optionally substituted with one or more substituents independently selected from -OR ¹² . In some embodiments, R ^7’ is C _1-6 alkyl optionally substituted with one or more substituents independently selected from -OR ¹² . In some embodiments, R ¹² of -OR ¹² is selected from hydrogen; and C1-3

alkyl. In some embodiments, R ^7’ is . [00212] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is selected from optionally substituted C1-4 alkyl. In some embodiments, R ^7’ is selected from

unsubstituted C _1-4 alkyl. In some embodiments, R ^7’ is selected from In

some embodiments, R ^7’ is In some embodiments, R ^7’ is

[00213] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is

selected from hydrogen, , , In some embodiments, R ^7’ is

selected from , ,

[00214] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is optionally substituted C _2-6 alkenyl. In some embodiments, R ^7’ is C _2-6 alkenyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle. In some embodiments, R ^7’ is C _2-6 alkenyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl. In some embodiments, R ^7’ is C _2-6 alkenyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, -CN. In some embodiments, R ^7’ is unsubstituted C _2-6 alkenyl. In some embodiments, R ^7’ is unsubstituted C2-4 alkenyl. In some embodiments, R ^7’ is

[00215] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), R ^7’ is optionally substituted C3-6 carbocycle optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , - N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl. In some embodiments, R ^7’ is selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, optionally substituted cyclopentyl, and optionally substituted cyclohexyl. In some embodiments, R ^7’ is selected from optionally substituted cyclopropyl, optionally substituted cyclobutyl, and optionally substituted phenyl. In some embodiments, R ^7’ is optionally substituted cyclopropyl. In some embodiments, R ^7’ is optionally substituted cyclobutyl. In some embodiments, R ^7’ is optionally substituted phenyl. [00216] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), n is 0, and R ^7’ is selected from C3-6 carbocycle, which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl. In some embodiments, wherein n is 0, and R ^7’ is selected from optionally substituted phenyl, which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, =S, -CN, and C _1-6 alkyl. In some embodiments, n is 0, and R ^7’ is selected from optionally substituted phenyl, which is optionally substituted with one or more substituents independently selected from halogen and -OR ¹² . In some embodiments, R ¹² of -OR ¹² is selected from C _1-6 alkyl. In some embodiments, n is 0, and

R ^7’ is selected In some embodiments, n is 0, and R ^7’ is In some embodiments, n is 0, and R ^7’ is

[00217] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), n is 1, L is methylene, and R ^7’ is selected from cyclopropyl and phenyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , - NO ₂ , =O, =S, -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl. In some embodiments, R ^7’ is selected from unsubstituted cyclopropyl and unsubstituted phenyl. In some embodiments, R ^7’ is In some embodiments, R ^7’ is

[00218] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), n is 0

and R ^7’ is selected from , , , , , , ; and wherein n is 1 and R ⁷ is selected from

[00219] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), n is 0

and R ^7’ is selected from , and wherein n is 1 and R ^7’ is selected from In some embodiments, n is 0 and R ^7’ is selected

f _rom

[00220] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), X is C(H); R ¹ is O; R ³ and R ⁴ are each independently -OH; R ⁵ is -C(O)N(H)(Me); R ⁶ is selected from:

, , , , , , , ; and (L) _n –R ^7’ is

selected from: , , , , , a d .

[00221] In some embodiments, for a compound or salt of Formula (III), (IIIA), or (IIIB), X is C(H); R ¹ is O; R ³ and R ⁴ are each independently -OH; R ⁵ is -C(O)N(H)(Me); R ⁶ is selected from:

and (L)n–R ^7’ is selected from: , , ,

[00222] In some embodiments, for a compound or salt of Formula (III) or (IIIA), is selected from:

,

.

[00223] In certain embodiments, the disclosure provides a compound represented by Formula (IV):

or a salt thereof, wherein:

X is selected from N and C(H);

R ¹ is selected from O and S;

R ³ and R ⁴ are independently selected from hydrogen, -OH, and -NH2;

R ⁵ is selected from is selected from -CH2OH and -C(O)N(H)(R ¹¹ );

R ⁶ is selected from:

hydrogen and -OR ¹⁰ ; and

C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C3- 12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl;

L is selected from C1-C3 alkylene, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

R ⁷ is independently selected from hydrogen; and C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , - N(R ¹² ) ₂ , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, wherein C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl are optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , - N(R ¹² ) ₂ , -S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), and -CN;

R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH ₂ , C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _2-10 alkenyl, C _2-10 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle;

R ¹¹ is selected from hydrogen; and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹² is independently selected from hydrogen; and C1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , and -NH2; and

n is 0 or 1.

[00224] In certain embodiments, for a compound or salt of Formula (IV), R ¹ is selected from O and S.

[00225] In certain embodiments, for a compound or salt of Formula (IV), R ¹ is O.

[00226] In certain embodiments, for a compound or salt of Formula (IV), X is N or C(H).

[00227] In certain embodiments, for a compound or salt of Formula (IV), X is N.

[00228] In certain embodiments, for a compound or salt of Formula (IV), R ³ and R ⁴ are each OH.

[00229] In certain embodiments, for a compound or salt of Formula (IV), R ¹¹ is selected from hydrogen and methyl.

[00230] In certain embodiments, for a compound or salt of Formula (IV), R ¹¹ is methyl.

[00231] In certain embodiments, for a compound or salt of Formula (IV), n is 1 and L is methylene.

[00232] In certain embodiments, for a compound or salt of Formula (IV), n is 0.

[00233] In certain embodiments, for a compound or salt of Formula (IV), R ⁷ is selected from hydrogen; and C ₅ -6 carbocycle and 5- to 9-membered heterocycle, wherein each of which is optionally substituted.

[00234] In certain embodiments, for a compound or salt of Formula (IV), R ⁷ is selected from hydrogen, optionally substituted phenyl, and optionally substituted heteroaryl. [00235] In certain embodiments, for a compound or salt of Formula (IV), R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN and 3- to 8-membered heterocycle, wherein 3- to 8- membered heterocycle is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , -CN, C _1-3 alkyl, and C _1-3 haloalkyl.

[00236] In certain embodiments, for a compound or salt of Formula (IV), R ⁶ is selected from methyl, ethyl, and propyl, any one of which is optionally substituted.

[00237] In certain embodiments, for a compound or salt of Formula (IV), R ⁸ is hydrogen.

[00238] In certain embodiments, a compound of Formula (IV) is represented by:

a salt of any one thereof.

[00239] In some aspects, the present disclosure provides a compound represented by Formula (V):

or a salt thereof, wherein:

X is selected from N and C(H);

R ¹ is selected from O, S, and C(R ²¹ ) ₂ ;

R ³ and R ⁴ are independently selected from hydrogen, -OH, and -NH2;

R ⁵ is selected from -C(O)N(H)(R ¹¹ ), and when R ¹ is S or C(R ²¹ ) ₂ , R ⁵ is further selected from CH ₂ OH;

R ²² is selected from hydrogen; or when R ¹ is C(R ²¹ ) ₂ , R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle and the other R ²¹ is hydrogen; each R ²¹ is hydrogen, or R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle and the other R ²¹ is hydrogen;

Ring A is selected from optionally substituted heteroaryl, and optionally substituted unsaturated heterocycle,

wherein the optionally substituted heteroaryl has one or more heteroatoms and no more than 2 nitrogen atoms, and

wherein the heteroaryl and the unsaturated heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

R ⁶ is selected from:

hydrogen and -OR ¹⁰ ; and

C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _3-12 carbocycle, and 3- to 12-membered heterocycle, wherein C3- 12 carbocycle, and 3- to 12-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , - N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl; and

C _3-12 carbocycle and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ ,

-C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 alkyl, C _1-6 haloalkyl C _2-6 alkenyl, and C _2-6 alkynyl;

wherein when R ⁶ is 2,2-diphenylethyl or tetrahydrofuranyl, R ¹¹ is selected from optionally substituted C1 alkyl, substituted C2 alkyl, and optionally substituted C3-6 alkyl; L is selected from C ₁ -C ₃ alkylene, optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , - S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

R ^7’ is independently selected from optionally substituted C _3-12 carbocycle and optionally substituted 3- to 12-membered heterocycle; and when n is 0, R ^7’ is further selected from hydrogen, optionally substituted C _1-6 alkyl, optionally substituted C _2-6 alkenyl, and optionally substituted C _2-6 alkynyl; wherein the C _3-12 carbocycle and 3- to 12-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² )C(O)R ¹² , -N(R ¹² )C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , - C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , -NO ₂ , =O, =S, =N(R ¹² ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

and wherein the C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -C(O)N(R ¹² ) ₂ , -N(R ¹² ) ₂ , -S(O)R ¹² , -S(O) ₂ R ¹² , -C(O)R ¹² , -C(O)OR ¹² , -OC(O)R ¹² , - NO ₂ , =O, =S, =N(R ¹² ), -CN;

R ⁸ is selected from hydrogen, halogen, and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹⁰ is independently selected from hydrogen; and C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle, each of which is optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , -NH ₂ , C _1-10 alkyl, -C _1-10 haloalkyl, -O-C _1-10 alkyl, C _2-10 alkenyl, C _2-10 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle; and

R ¹¹ is selected from hydrogen; and C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -C(O)N(R ¹⁰ ) ₂ , - S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), and -CN;

each R ¹² is independently selected from hydrogen; and C1-3 alkyl optionally substituted with one or more substituents independently selected from halogen, -OH, -CN, -NO ₂ , and -NH2; and

n is 0 or 1.

[00240] In some embodiments, Formula (V) is represented by Formula (VA):

salt thereof.

[00241] In some embodiments, for a compound or salt of Formula (V), R ¹ is C(R ²¹ ) ₂ and R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3-membered carbocycle and the other R ²¹ is hydrogen. In some embodiments, R ¹ is selected from O and S. In some embodiments, R ¹ is O. In some embodiments, R ¹ is S. [00242] In some embodiments, Formula (V) is represented by Formula (VB):

salt thereof.

[00243] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), X is C(H). In some embodiments, X is N.

[00244] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ¹ is C(R ²¹ ) ₂ and R ²² and one R ²¹ come together with the atoms to which they are bound to form a 3- membered carbocycle and the other R ²¹ is hydrogen. In some embodiments, R ¹ is selected from O and S. In some embodiments, R ¹ is O. In some embodiments, R ¹ is S.

[00245] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ³ and R ⁴ are independently selected from hydrogen and -OH. In some embodiments, R ³ and R ⁴ are independently selected from hydrogen and -NH2. In some embodiments, R ³ and R ⁴ are independently selected from -OH and -NH2. In some embodiments, R ³ and R ⁴ are each selected from two different substituents, for example, R ³ is hydrogen and R ⁴ is -OH. In some

embodiments, R ³ and R ⁴ are each selected from the same substituent, for example, R ³ is hydrogen and R ⁴ is hydrogen. In some embodiments, R ³ and R ⁴ are each -OH.

[00246] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁵ is C(O)N(H)(R ¹¹ ) and R ¹¹ is selected from hydrogen; C ₁ - ₆ alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, and -CN. In some embodiments, R ¹¹ is selected from hydrogen and C _1-6 alkyl. In some embodiments, R ¹¹ is selected from hydrogen and C ₁ - ₆ alkyl. In some embodiments, R ¹¹ is selected from hydrogen and methyl. In some embodiments, R ⁵ is C(O)N(H)(Me). In some embodiments, R ⁵ is -CH2OH.

[00247] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), n is 0. In some embodiments, n is 1.

[00248] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), L is selected from C1-C3 alkylene optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, and -CN. In some embodiments, L is selected from unsubstituted C ₁ -C ₃ alkylene. In some embodiments, n is 1 and L is selected from methylene, ethylene, and propylene any of which is optionally substituted. In some embodiments, n is 1 and L is selected from methylene, ethylene, and propylene. In some embodiments, n is 1 and L is optionally substituted methylene. In some embodiments, n is 1 and L is methylene. In some embodiments, n is 1 and L is optionally substituted ethylene. In some embodiments, n is 1 and L is ethylene. In some embodiments, n is 1 and L is optionally substituted propylene. In some embodiments, n is 1 and L is propylene.

[00249] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), Ring A is an optionally substituted heteroaryl, wherein the heteroaryl has one or more heteroatoms and no more than 2 nitrogen atoms; or an optionally substituted unsaturated heterocycle. In some embodiments, Ring A is an optionally substituted 5- to 12- membered heteroaryl. In some embodiments, Ring A is an optionally substituted 5- to 6- membered heteroaryl. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has one or more heteroatoms and no more than 2 nitrogen atoms. In some embodiments, Ring A is an optionally substituted 5- to 6- membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has 2 nitrogen heteroatoms. In some embodiments, Ring A is an optionally substituted 5- to 6- membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has 2 nitrogen heteroatoms and 1 other heteroatom selected from oxygen and sulfur. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has 2 nitrogen heteroatoms and 1 oxygen heteroatom.

[00250] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl comprises one or more heteroatoms and no more than 1 nitrogen atom. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has 1 nitrogen heteroatom. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has 1 nitrogen heteroatom and 1 other heteroatom selected from oxygen and sulfur. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has 1 nitrogen heteroatom and 1 oxygen heteroatom. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6- membered heteroaryl has 1 nitrogen heteroatom and 1 sulfur heteroatom.

[00251] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has one or more heteroatoms selected from oxygen and sulfur. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has one or more heteroatoms selected from oxygen. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has one or two heteroatoms selected from oxygen. In some embodiments, Ring A is an optionally substituted 5- to 6- membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has one or more heteroatoms selected from sulfur. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has one or two heteroatoms selected from sulfur. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6- membered heteroaryl has 1 sulfur heteroatom. In some embodiments, Ring A is an optionally substituted 5- to 6-membered heteroaryl wherein the optionally substituted 5- to 6-membered heteroaryl has 1 oxygen heteroatom.

[00252] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), Ring A is an heteroaryl (e.g., 5- to 6-membered heteroaryl) optionally substituted with one or more substituents selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , - N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl. In some embodiments, the unsaturated heterocycle is optionally substituted with one or more substituents selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, and C _1-6 alkyl. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl. In some embodiments, the unsaturated heterocycle is unsubstituted.

[00253] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), Ring A is an optionally substituted 5- to 6- membered heteroaryl. In some embodiments, Ring A is an optionally substituted 6-membered heteroaryl. In some embodiments, Ring A is an optionally substituted 5-membered heteroaryl. In some embodiments, the 5-membered heteroaryl is selected from: furan, oxazole, pyrrole, thiophene, thiazole, pyrazole, imidazole, isothiazole, isoxazole, pyrroline, pyrazoline, imidazoline, and oxadiazole. In some embodiments, the 5- membered heteroaryl is selected from: oxazole, pyrrole, thiazole, pyrazole, imidazole, isothiazole, isoxazole, pyrroline, pyrazoline, imidazoline, and oxadiazole. In some embodiments,

the 5-membered of Ring A heteroaryl is selected from:

[00254] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), the 5- membered heteroaryl of Ring A has one or two nitrogen atoms and optionally one or more additional heteroatoms independently selected from O and S. In some embodiments, the 5- membered heteroaryl is selected from: oxazole, pyrrole, thiazole, pyrazole, imidazole, isothiazole, isoxazole, pyrroline, pyrazoline, imidazoline, and oxadiazole. In some embodiments, wherein the 5-membered heteroaryl is selected from: pyrazole, isoxazole, and oxadiazole. In

some embodiments, Ring A is selected from:

, , , , , a d . In some embodiments, Ring A

is selected from: In some embodiments, Ring A is

. In some embodiments, Ring A is . In some embodiments, Ring A is .

[00255] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), Ring A is optionally substituted unsaturated heterocycle. In some embodiments, the unsaturated heterocycle is selected from a 3- to 12- membered heterocycle, 3- to 8-membered heterocycle, and 3- to 6-membered heterocycle. In some embodiments, the unsaturated heterocycle is selected from a 3- to 6-membered heterocycle. In some embodiments, the unsaturated heterocycle is optionally substituted with one or more substituents selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ )C(O)R ¹⁰ , -N(R ¹⁰ )C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , - OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl. In some embodiments, the unsaturated heterocycle is optionally substituted with one or more substituents selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, and C _1-6 alkyl. In some embodiments, each R ¹⁰ is independently selected from hydrogen and C _1-6 alkyl. In some embodiments, the unsaturated heterocycle is unsubstituted.

[00256] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is selected from

-OR ¹⁰ ;

C _1-6 alkyl optionally substituted halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _3-6 carbocycle, and 3- to 6-membered heterocycle, wherein C3-6 carbocycle, and 3- to 6-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, C _1-6 alkyl, C _2-6 alkenyl, and C _2-6 alkynyl;

optionally substituted C3-6 carbocycle, and optionally substituted 3- to 6-membered heterocycle each of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl.

[00257] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is selected from

C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, 5- to 6-membered heteroaryl, wherein the 5- to 6-membered heteroaryl are optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, C _1-6 haloalkyl, and C _1-6 alkyl; C3-6 carbocycle and 3- to 6-membered heterocycle, any of which is optionally substituted with one or more substituents independently selected from halogen, -NO ₂ , =O, =S, -CN, C _1-6 alkyl, and C _1-6 haloalkyl.

[00258] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is - OR ¹⁰ . In some embodiments, R ⁶ is -OR ¹⁰ and R ¹⁰ is selected from hydrogen, C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _3-12 carbocycle, and 3- to 12-membered heterocycle. In some

embodiments, R ⁶ is -OR ¹⁰ and R ¹⁰ is selected from hydrogen and C _1-6 alkyl. In some

embodiments, R ⁶ is -OR ¹⁰ and R ¹⁰ is selected from C _1-6 alkyl. In some embodiments, R ¹⁰ of - OR ¹⁰ is selected from C _1-3 alkyl. In some embodiments, R ¹⁰ of -OR ¹⁰ is selected from methyl, ethyl, and propyl. In some embodiments, R ⁶ is -OH.

[00259] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -C(O)N(R ¹⁰ ) ₂ , -N(R ¹⁰ ) ₂ , -S(O)R ¹⁰ , -S(O) ₂ R ¹⁰ , -C(O)R ¹⁰ , -C(O)OR ¹⁰ , -OC(O)R ¹⁰ , -NO ₂ , =O, =S, =N(R ¹⁰ ), -CN; and 3- to 8-membered heterocycle, wherein 3- to 8-membered heterocycle are optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -SR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , -CN, C _1-3 alkyl, and C _1-3 haloalkyl.

[00260] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is selected from C _1-6 alkyl. In some embodiments, R ⁶ is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl each of which is optionally substituted. In some embodiments, the C _1-6 alkyl of R ⁶ is optionally substituted with one or more substituents independently selected from halogen, - NO ₂ , =O, -CN, and optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more halogen atoms. In some embodiments, R ⁶ is selected from C _1-6 alkyl optionally substituted with one or more halogen atoms selected from fluorine, chlorine, and bromine. In some embodiments, R ⁶ is selected from C _1-6 alkyl substituted with one or more substituents independently selected from 5- to 6- membered heteroaryl. In some embodiments, R ⁶ is selected from C _1-6 alkyl substituted with an optionally substituted 5- to 6-membered heteroaryl. In some embodiments, the C _1-6 alkyl of R ⁶ is optionally substituted with one or more substituents independently selected from optionally substituted C _3-6 carbocycle. In some embodiments, the C _1-6 alkyl of R ⁶ is optionally substituted with one or more substituents independently selected from unsubstituted C3-6 carbocycle.

[00261] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is selected from optionally substituted C _3-6 carbocycle and optionally substituted 3- to 6-membered heterocycle. In some embodiments, R ⁶ is selected from optionally substituted C3-6 carbocycle. In some embodiments, R ⁶ is selected from C3 carbocycle, C4 carbocycle, C ₅ carbocycle, and C6 carbocycle each of which is optionally substituted. In some embodiments, the optionally substituted C3-6 carbocycle of R ⁶ is saturated. In some embodiments, the optionally substituted C _3-6 carbocycle of R ⁶ is unsaturated. In some embodiments, the optionally substituted C _4-6 carbocycle of R ⁶ is aromatic. In some embodiments, R ⁶ is selected from cyclopropyl, cyclobutyl, cyclopentyl, and cyclopentyl each of which is optionally substituted. In some embodiments, R ⁶ is optionally substituted cyclopropyl. In some embodiments, R ⁶ is optionally substituted cyclobutyl. In some embodiments, R ⁶ is optionally substituted cyclopentyl. In some

embodiments, R ⁶ is optionally substituted cyclohexyl. In some embodiments, R ⁶ is selected from cyclopropyl, cyclobutyl, cyclopentyl, and cyclopentyl each of which is unsubstituted.

[00262] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is 3- to 6-membered heterocycle. In some embodiments, R ⁶ is an optionally substituted 3- to 6- membered heterocycle selected from 3-membered heterocycle, 4-membered heterocycle, 5- membered heterocycle, and 6-membered heterocycle any of which is optionally substituted. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ is saturated. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ is unsaturated. In some embodiments, the 3- to 6- membered heterocycle of R ⁶ is aromatic. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ has at least one heteroatom selected from oxygen, nitrogen, sulfur, and any combination thereof. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ has at least one heteroatom selected from oxygen, nitrogen, and sulfur. In some embodiments, the 3- to 6- membered heterocycle of R ⁶ has at least one heteroatom selected from oxygen and nitrogen. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ has at least one heteroatom selected from oxygen and sulfur. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ has at least one heteroatom selected from nitrogen and sulfur. In some embodiments, the 3- to 6- membered heterocycle of R ⁶ has at least one heteroatom selected from oxygen. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ has at least one heteroatom selected from nitrogen. In some embodiments, the 3- to 6-membered heterocycle of R ⁶ has at least one heteroatom selected from sulfur. In some embodiments, R ⁶ is 3- to 6-membered heterocycle, any of which is optionally substituted with one or more substituents independently selected from halogen, -OR ¹⁰ , -N(R ¹⁰ ) ₂ , -NO ₂ , =O, -CN, C _1-6 alkyl, C _1-6 haloalkyl. In some embodiments, wherein R ⁶ is 4- to 5-membered heterocycle, which is optionally substituted with one or more substituents independently selected from C _1-6 alkyl.

[00263] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is 2,2-diphenylethyl or tetrahydrofuranyl, and R ¹¹ is selected from optionally substituted C ₁ alkyl, substituted C2 alkyl, and optionally substituted C3-6 alkyl. In some embodiments, R ⁶ is 2,2- diphenylethyl and R ¹¹ is selected from optionally substituted C1 alkyl, substituted C2 alkyl, and optionally substituted C3-6 alkyl. In some embodiments, R ⁶ is tetrahydrofuranyl and R ¹¹ is selected from optionally substituted C1 alkyl, substituted C2 alkyl, and optionally substituted C3-6 alkyl.

[00264] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁶ is

. In some embodiments, when R ¹¹ is C ₂ alkyl and R ⁶ is not

[00265] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ^7’ is independently selected from hydrogen, C _1-6 alkyl, C _2-6 alkenyl, C _3-6 carbocycle and 3- to 6- membered heterocycle;

wherein the C3-6 carbocycle and 3- to 6-membered heterocycle are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , - NO ₂ , =O, -CN, C _1-6 haloalkyl, and C _1-6 alkyl;

and wherein the C _1-6 alkyl and C _2-6 alkenyl are each optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , =O, and -CN.

[00266] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ^7’ is selected from hydrogen; and C3-6 carbocycle and 5- to 9-membered heterocycle, wherein each of which is optionally substituted with one or more substituents selected from halogen, -OR ¹² , -SR ¹² , -N(R ¹² ) ₂ , -NO ₂ , -CN, C _1-6 alkyl, and C _1-6 haloalkyl. R ^7’ is selected from hydrogen, optionally substituted phenyl, and optionally substituted heteroaryl. In some embodiments, n is 0 and R ^7’ is selected from hydrogen, optionally substituted phenyl, and optionally substituted heteroaryl. In some embodiments, n is 0 and R ^7’ is selected from hydrogen.

[00267] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ^7’ is C _1-6 alkyl is optionally substituted with one or more substituents independently selected from halogen, -OR ¹² , -SR ¹² , -NO ₂ , and -CN. In some embodiments, C _1-6 alkyl of R ^7’ is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl each of which is optionally substituted. In some embodiments, n is 0 and R ^7’ is optionally substituted C _1-6 alkyl. In some embodiments, n is 0 and R ^7’ is selected from methyl, ethyl, propyl, butyl, pentyl, and hexyl each of which is optionally substituted.

[00268] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ^7’ is optionally substituted C3-6 carbocycle. In some embodiments, R ^7’ is selected from C3 carbocycle, C4 carbocycle, C ₅ carbocycle, and C6 carbocycle each of which is optionally substituted. In some embodiments, the optionally substituted C3-6 carbocycle of R ^7’ is saturated. In some

embodiments, the optionally substituted C _3-6 carbocycle of R ^7’ is unsaturated. In some embodiments, the optionally substituted C4-6 carbocycle of R ^7’ is aromatic. In some

embodiments, R ^7’ is selected from cyclopropyl, cyclobutyl, cyclopentyl, and cyclopentyl each of which is optionally substituted. In some embodiments, R ^7’ is optionally substituted cyclopropyl. In some embodiments, R ^7’ is optionally substituted cyclobutyl. In some embodiments, R ^7’ is optionally substituted cyclopentyl. In some embodiments, R ^7’ is optionally substituted cyclohexyl. In some embodiments, R ^7’ is selected from cyclopropyl, cyclobutyl, cyclopentyl, and cyclopentyl each of which is unsubstituted.

[00269] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ^7’ is an optionally substituted 5- to 9-membered heterocycle. In some embodiments, the optionally substituted 5- to 9-membered heterocycle of R ^7’ comprises at least one heteroatom selected from oxygen, nitrogen, sulfur, and any combination thereof. In some embodiments, the optionally substituted 5- to 9-membered heterocycle of R ^7’ comprises at least one heteroatom selected from oxygen, nitrogen, and any combination thereof. In some embodiments, the optionally substituted 5- to 9-membered heterocycle of R ^7’ comprises at least one heteroatom selected from oxygen, sulfur, and any combination thereof. In some embodiments, the optionally substituted 5- to 9- membered heterocycle of R ^7’ comprises at least one heteroatom selected from nitrogen, sulfur, and any combination thereof. In some embodiments, the optionally substituted 5- to 9- membered heterocycle of R ^7’ comprises at least one heteroatom selected from oxygen. In some embodiments, the optionally substituted 5- to 9-membered heterocycle of R ^7’ comprises at least one heteroatom selected from nitrogen. In some embodiments, the optionally substituted 5- to 9- membered heterocycle of R ^7’ comprises at least one heteroatom selected from sulfur. In some embodiments, the optionally substituted 5- to 9-membered heterocycle of R ^7’ is saturated. In some embodiments, the optionally substituted 5- to 9-membered heterocycle of R ^7’ is unsaturated. In some embodiments, the optionally substituted 5- to 9-membered heterocycle of R ^7’ is aromatic. In some embodiments, R ^7’ is selected from a 5-membered heterocycle, 6- membered heterocycle, 7-membered heterocycle, 8-membered heterocycle, and 9-membered heterocycle any of which is optionally substituted.

[00270] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ^7’ is an optionally substituted 5- to 6-membered heterocycle has at least one heteroatom selected from N and O. In some embodiments, R ^7’ is an optionally substituted 5- to 6-membered heterocycle has at least one nitrogen heteroatom. In some embodiments, R ^7’ is an optionally substituted 5- to 6- membered heterocycle has at least one oxygen heteroatom. In some embodiments, R ^7’ is an optionally substituted 5- to 6-membered heteroaryl. In some embodiments, the 5- to 6-membered heteroaryl of R ^7’ is optionally substituted with one or more substituents selected from halogen, - OR ¹² , C _1-6 alkyl, and C _1-6 haloalkyl, wherein R ¹² is selected from C ₁ - ₃ alkyl. In some

embodiments, the 5- to 6-membered heteroaryl of R ^7’ is unsubstituted.

[00271] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), n is 0

and R ^7’ is

[00272] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), n is 0 and R ^7’ is selected from , , In some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is In some embodiments, n is 0 and R ^7’ is

[00273] In some embodiments, for a compound or salt of Formula (V), (VA), or (VB), R ⁸ is hydrogen.

[00274] In some embodiments, for a compound or salt of Formula (V) or (VA), the compound

is selected from: , ,

pharmaceutically acceptable salt of any one thereof.

[00275] Included in the present disclosure are salts, particularly pharmaceutically acceptable salts, of the compounds described herein. The compounds of the present invention that possess a sufficiently acidic, a sufficiently basic, or both functional groups, can react with any of a number of inorganic bases, and inorganic and organic acids, to form a salt. Alternatively, compounds that are inherently charged, such as those with a quaternary nitrogen, can form a salt with an appropriate counterion, e.g., a halide such as bromide, chloride, or fluoride, particularly bromide.

[00276] Chemical entities having carbon-carbon double bonds or carbon-nitrogen double bonds may exist in Z- or E- form (or cis- or trans- form). Furthermore, some chemical entities may exist in various tautomeric forms. Unless otherwise specified, compounds described herein are intended to include all Z-, E- and tautomeric forms as well.

[00277] A“tautomer” refers to a molecule wherein a proton shift from one atom of a molecule to another atom of the same molecule is possible. The compounds presented herein, in certain embodiments, exist as tautomers. In circumstances where tautomerization is possible, a chemical equilibrium of the tautomers will exist. The exact ratio of the tautomers depends on several factors, including physical state, temperature, solvent, and pH. Some examples of tautomeric equilibrium include:

.

[00278] The compounds disclosed herein, in some embodiments, are used in different enriched isotopic forms, e.g., enriched in the content of ² H, ³ H, ¹¹ C, ¹³ C and/or ¹⁴ C. In one particular embodiment, the compound is deuterated in at least one position. Such deuterated forms can be made by the procedure described in U.S. Patent Nos.5,846,514 and 6,334,997. As described in U.S. Patent Nos.5,846,514 and 6,334,997, deuteration can improve the metabolic stability and or efficacy, thus increasing the duration of action of drugs.

[00279] Unless otherwise stated, compounds described herein are intended to include compounds which differ only in the presence of one or more isotopically enriched atoms. For example, compounds having the present structures except for the replacement of a hydrogen by a deuterium or tritium, or the replacement of a carbon by ¹³ C- or ¹⁴ C-enriched carbon are within the scope of the present disclosure.

[00280] The compounds of the present disclosure optionally contain unnatural proportions of atomic isotopes at one or more atoms that constitute such compounds. For example, the compounds may be labeled with isotopes, such as for example, deuterium ( ² H), tritium ( ³ H), iodine-125 ( ¹²⁵ I) or carbon-14 ( ¹⁴ C). Isotopic substitution with ² H, ¹¹ C, ¹³ C, ¹⁴ C, ¹⁵ C, ¹² N, ¹³ N, ¹⁵ N, ¹⁶ N, ¹⁶ O, ¹⁷ O, ¹⁴ F, ¹⁵ F, ¹⁶ F, ¹⁷ F, ¹⁸ F, ³³ S, ³⁴ S, ³⁵ S, ³⁶ S, ³⁵ Cl, ³⁷ Cl, ⁷⁹ Br, ⁸¹ Br, and ¹²⁵ I are all contemplated. All isotopic variations of the compounds of the present invention, whether radioactive or not, are encompassed within the scope of the present invention.

[00281] In certain embodiments, the compounds disclosed herein have some or all of the ¹ H atoms replaced with ² H atoms. The methods of synthesis for deuterium-containing compounds are known in the art and include, by way of non-limiting example only, the following synthetic methods.

[00282] Deuterium substituted compounds are synthesized using various methods such as described in: Dean, Dennis C.; Editor. Recent Advances in the Synthesis and Applications of Radiolabeled Compounds for Drug Discovery and Development. [In: Curr., Pharm. Des., 2000; 6(10)] 2000, 110 pp; George W.; Varma, Rajender S. The Synthesis of Radiolabeled

Compounds via Organometallic Intermediates, Tetrahedron, 1989, 45(21), 6601-21; and Evans, E. Anthony. Synthesis of radiolabeled compounds, J. Radioanal. Chem., 1981, 64(1-2), 9-32.

[00283] Deuterated starting materials are readily available and are subjected to the synthetic methods described herein to provide for the synthesis of deuterium-containing compounds. Large numbers of deuterium-containing reagents and building blocks are available commercially from chemical vendors, such as Aldrich Chemical Co.

[00284] Compounds of the present invention also include crystalline and amorphous forms of those compounds, pharmaceutically acceptable salts, and active metabolites of these compounds having the same type of activity, including, for example, polymorphs, pseudopolymorphs, solvates, hydrates, unsolvated polymorphs (including anhydrates), conformational polymorphs, and amorphous forms of the compounds, as well as mixtures thereof.

[00285] The compounds described herein may in some cases exist as diastereomers, enantiomers, or other stereoisomeric forms. Where absolute stereochemistry is not specified, the compounds presented herein include all diastereomeric, enantiomeric, and epimeric forms as well as the appropriate mixtures thereof. Separation of stereoisomers may be performed by chromatography or by forming diastereomers and separating by recrystallization, or

chromatography, or any combination thereof. (Jean Jacques, Andre Collet, Samuel H. Wilen, “Enantiomers, Racemates and Resolutions”, John Wiley And Sons, Inc., 1981, herein incorporated by reference for this disclosure). Stereoisomers may also be obtained by stereoselective synthesis.

[00286] The methods and compositions described herein include the use of amorphous forms as well as crystalline forms (also known as polymorphs). The compounds described herein may be in the form of pharmaceutically acceptable salts. As well, in some embodiments, active metabolites of these compounds having the same type of activity are included in the scope of the present disclosure. In addition, the compounds described herein can exist in unsolvated as well as solvated forms with pharmaceutically acceptable solvents such as water, ethanol, and the like. The solvated forms of the compounds presented herein are also considered to be disclosed herein.

[00287] In certain embodiments, compounds or salts of the compounds may be prodrugs, e.g., wherein a hydroxyl in the parent compound is presented as an ester or a carbonate, or carboxylic acid present in the parent compound is presented as an ester. The term“prodrug” is intended to encompass compounds which, under physiologic conditions, are converted into pharmaceutical agents of the present disclosure. One method for making a prodrug is to include one or more selected moieties which are hydrolyzed under physiologic conditions to reveal the desired molecule. In other embodiments, the prodrug is converted by an enzymatic activity of the host animal such as specific target cells in the host animal. For example, esters or carbonates (e.g., esters or carbonates of alcohols or carboxylic acids and esters of phosphonic acids) are preferred prodrugs of the present disclosure.

[00288] Prodrug forms of the herein described compounds, wherein the prodrug is metabolized in vivo to produce a compound as set forth herein are included within the scope of the claims. In some cases, some of the herein-described compounds may be a prodrug for another derivative or active compound.

[00289] Prodrugs are often useful because, in some situations, they may be easier to administer than the parent drug. They may, for instance, be bioavailable by oral administration whereas the parent is not. Prodrugs may help enhance the cell permeability of a compound relative to the parent drug. The prodrug may also have improved solubility in pharmaceutical compositions over the parent drug. Prodrugs may be designed as reversible drug derivatives, for use as modifiers to enhance drug transport to site-specific tissues or to increase drug residence inside of a cell.

[00290] In some embodiments, the design of a prodrug increases the lipophilicity of the pharmaceutical agent. In some embodiments, the design of a prodrug increases the effective water solubility. See, e.g., Fedorak et al., Am. J. Physiol., 269:G210-218 (1995); McLoed et al., Gastroenterol, 106:405-413 (1994); Hochhaus et al., Biomed. Chrom., 6:283-286 (1992); J. Larsen and H. Bundgaard, Int. J. Pharmaceutics, 37, 87 (1987); J. Larsen et al., Int. J.

Pharmaceutics, 47, 103 (1988); Sinkula et al., J. Pharm. Sci., 64:181-210 (1975); T. Higuchi and V. Stella, Pro-drugs as Novel Delivery Systems, Vol.14 of the A.C.S. Symposium Series; and Edward B. Roche, Bioreversible Carriers in Drug Design, American Pharmaceutical Association and Pergamon Press, 1987, all incorporated herein for such disclosure). According to another embodiment, the present disclosure provides methods of producing the above-defined compounds. The compounds may be synthesized using conventional techniques.

Advantageously, these compounds are conveniently synthesized from readily available starting materials.

[00291] Synthetic chemistry transformations and methodologies useful in synthesizing the compounds described herein are known in the art and include, for example, those described in R. Larock, Comprehensive Organic Transformations (1989); T. W. Greene and P. G. M.

Wuts, Protective Groups in Organic Synthesis, 2d. Ed. (1991); L. Fieser and M. Fieser, Fieser and Fieser’s Reagents for Organic Synthesis (1994); and L. Paquette, ed., Encyclopedia of Reagents for Organic Synthesis (1995).

C. Pharmaceutical Compositions

[00292] Provided herein, in certain embodiments, are compositions comprising a

therapeutically effective amount of any compound or salt of any one of Formulas (I), (IA), (II), (III), (IIA), (IIIB) (IV), (V), (VA), and (VB) (also referred to herein as“a pharmaceutical agent”).

[00293] Pharmaceutical compositions may be formulated using one or more physiologically acceptable carriers including excipients and auxiliaries which facilitate processing of the pharmaceutical agent into preparations which are used pharmaceutically. Proper formulation is dependent upon the route of administration chosen. A summary of pharmaceutical compositions is found, for example, in Remington: The Science and Practice of Pharmacy, Nineteenth Ed (Easton, Pa., Mack Publishing Company, 1995); Hoover, John E., Remington’s Pharmaceutical Sciences, Mack Publishing Co., Easton, Pennsylvania 1975; Liberman, H.A. and Lachman, L., Eds., Pharmaceutical Dosage Forms, Marcel Decker, New York, N.Y., 1980; and

Pharmaceutical Dosage Forms and Drug Delivery Systems, Seventh Ed. (Lippincott Williams & Wilkins, 1999).

[00294] The compositions and methods of the present disclosure may be utilized to treat an individual in need thereof. In certain embodiments, the individual is a mammal such as a human, or a non-human mammal. When administered to an animal, such as a human, the composition or the pharmaceutical agent, is preferably administered as a pharmaceutical composition comprising, for example, a pharmaceutical agent and a pharmaceutically acceptable carrier or excipient. Pharmaceutically acceptable carriers are well known in the art and include, for example, aqueous solutions such as water or physiologically buffered saline or other solvents or vehicles such as glycols, glycerol, oils such as olive oil, or injectable organic esters. In a preferred embodiment, when such pharmaceutical compositions are for human administration, particularly for invasive routes of administration, e.g., routes, such as injection or implantation, that circumvent transport or diffusion through an epithelial barrier, the aqueous solution is pyrogen-free, or substantially pyrogen-free. The excipients can be chosen, for example, to effect delayed release of an agent or to selectively target one or more cells, tissues or organs. The pharmaceutical composition can be in dosage unit form such as tablet, capsule, granule, lyophile for reconstitution, powder, solution, syrup, suppository, injection or the like. The composition can also be present in a transdermal delivery system, e.g., a skin patch. The composition can also be present in a solution suitable for topical administration, such as an eye drop.

[00295] A pharmaceutically acceptable excipient can contain physiologically acceptable agents that act, for example, to stabilize, increase solubility or to increase the absorption of a compound such as a pharmaceutical agent. Such physiologically acceptable agents include, for example, carbohydrates, such as glucose, sucrose or dextrans, antioxidants, such as ascorbic acid or glutathione, chelating agents, low molecular weight proteins or other stabilizers or excipients. The choice of a pharmaceutically acceptable excipient, including a physiologically acceptable agent, depends, for example, on the route of administration of the composition. The preparation or pharmaceutical composition can be a self emulsifying drug delivery system or a self microemulsifying drug delivery system. The pharmaceutical composition (preparation) also can be a liposome or other polymer matrix, which can have incorporated therein, for example, a compound of the invention. Liposomes, for example, which comprise phospholipids or other lipids, are nontoxic, physiologically acceptable and metabolizable carriers that are relatively simple to make and administer.

[00296] A pharmaceutical composition (preparation) can be administered to a subject by any of a number of routes of administration including, for example, orally, for example, drenches as in aqueous or non-aqueous solutions or suspensions, tablets, capsules, including sprinkle capsules and gelatin capsules, boluses, powders, granules, pastes for application to the tongue; absorption through the oral mucosa, e.g., sublingually; anally, rectally or vaginally, for example, as a pessary, cream or foam; parenterally, including intramuscularly, intravenously,

subcutaneously or intrathecally as, for example, a sterile solution or suspension; nasally;

intraperitoneally; subcutaneously; transdermally, for example, as a patch applied to the skin; and topically, for example, as a cream, ointment or spray applied to the skin, or as an eye drop. The compound may also be formulated for inhalation. In certain embodiments, a compound may be simply dissolved or suspended in sterile water.

[00297] A pharmaceutical composition may be a sterile aqueous or non-aqueous solution, suspension or emulsion, e.g., a microemulsion. The excipients described herein are examples and are in no way limiting. An effective amount or therapeutically effective amount refers to an amount of the one or more pharmaceutical agents administered to a subject, either as a single dose or as part of a series of doses, which is effective to produce a desired therapeutic effect.

[00298] Subjects may generally be monitored for therapeutic effectiveness using assays and methods suitable for the condition being treated, which assays will be familiar to those having ordinary skill in the art and are described herein. Pharmacokinetics of a pharmaceutical agent, or one or more metabolites thereof, that is administered to a subject may be monitored by determining the level of the pharmaceutical agent or metabolite in a biological fluid, for example, in the blood, blood fraction, e.g., serum, and/or in the urine, and/or other biological sample or biological tissue from the subject. Any method practiced in the art and described herein to detect the agent may be used to measure the level of the pharmaceutical agent or metabolite during a treatment course.

[00299] The dose of a pharmaceutical agent described herein for treating a disease or disorder may depend upon the subject’s condition, that is, stage of the disease, severity of symptoms caused by the disease, general health status, as well as age, gender, and weight, and other factors apparent to a person skilled in the medical art. Pharmaceutical compositions may be

administered in a manner appropriate to the disease to be treated as determined by persons skilled in the medical arts. In addition to the factors described herein and above related to use of pharmaceutical agent for treating a disease or disorder, suitable duration and frequency of administration of the pharmaceutical agent may also be determined or adjusted by such factors as the condition of the patient, the type and severity of the patient’s disease, the particular form of the active ingredient, and the method of administration. Optimal doses of an agent may generally be determined using experimental models and/or clinical trials. The optimal dose may depend upon the body mass, weight, or blood volume of the subject. The use of the minimum dose that is sufficient to provide effective therapy is usually preferred. Design and execution of pre-clinical and clinical studies for a pharmaceutical agent, including when administered for prophylactic benefit, described herein are well within the skill of a person skilled in the relevant art. When two or more pharmaceutical agents are administered to treat a disease or disorder, the optimal dose of each pharmaceutical agent may be different, such as less than when either agent is administered alone as a single agent therapy. In certain particular embodiments, two pharmaceutical agents in combination may act synergistically or additively, and either agent may be used in a lesser amount than if administered alone. An amount of a pharmaceutical agent that may be administered per day may be, for example, between about 0.01 mg/kg and 100 mg/kg, e.g., between about 0.1 to 1 mg/kg, between about 1 to 10 mg/kg, between about 10-50 mg/kg, between about 50-100 mg/kg body weight. In other embodiments, the amount of a

pharmaceutical agent that may be administered per day is between about 0.01 mg/kg and 1000 mg/kg, between about 100-500 mg/kg, or between about 500-1000 mg/kg body weight. The optimal dose, per day or per course of treatment, may be different for the disease or disorder to be treated and may also vary with the administrative route and therapeutic regimen.

[00300] Pharmaceutical compositions comprising a pharmaceutical agent can be formulated in a manner appropriate for the delivery method by using techniques routinely practiced in the art. The composition may be in the form of a solid, e.g., tablet, capsule, semi-solid, e.g., gel, liquid, or gas, e.g., aerosol. In other embodiments, the pharmaceutical composition is administered as a bolus infusion.

[00301] Pharmaceutical acceptable excipients are well known in the pharmaceutical art and described, for example, in Rowe et al., Handbook of Pharmaceutical Excipients: A

Comprehensive Guide to Uses, Properties, and Safety, 5 ^th Ed., 2006, and in Remington: The Science and Practice of Pharmacy (Gennaro, 21 ^st Ed. Mack Pub. Co., Easton, PA (2005)).

Exemplary pharmaceutically acceptable excipients include sterile saline and phosphate buffered saline at physiological pH. Preservatives, stabilizers, dyes, buffers, and the like may be provided in the pharmaceutical composition. In addition, antioxidants and suspending agents may also be used. In general, the type of excipient is selected based on the mode of administration, as well as the chemical composition of the active ingredient(s). Alternatively, compositions described herein may be formulated as a lyophilizate. A composition described herein may be lyophilized or otherwise formulated as a lyophilized product using one or more appropriate excipient solutions for solubilizing and/or diluting the pharmaceutical agent(s) of the composition upon administration. In other embodiments, the pharmaceutical agent may be encapsulated within liposomes using technology known and practiced in the art. In certain particular embodiments, a pharmaceutical agent is not formulated within liposomes for application to a stent that is used for treating highly, though not totally, occluded arteries. Pharmaceutical compositions may be formulated for any appropriate manner of administration described herein and in the art.

[00302] A pharmaceutical composition, e.g., for oral administration or for injection, infusion, subcutaneous delivery, intramuscular delivery, intraperitoneal delivery or other method, may be in the form of a liquid. A liquid pharmaceutical composition may include, for example, one or more of the following: a sterile diluent such as water, saline solution, preferably physiological saline, Ringer’s solution, isotonic sodium chloride, fixed oils that may serve as the solvent or suspending medium, polyethylene glycols, glycerin, propylene glycol or other solvents;

antibacterial agents; antioxidants; chelating agents; buffers and agents for the adjustment of tonicity such as sodium chloride or dextrose. A parenteral composition can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic. The use of physiological saline is preferred, and an injectable pharmaceutical composition is preferably sterile. In another embodiment, for treatment of an ophthalmological condition or disease, a liquid pharmaceutical composition may be applied to the eye in the form of eye drops. A liquid pharmaceutical composition may be delivered orally.

[00303] For oral formulations, at least one of the pharmaceutical agents described herein can be used alone or in combination with appropriate additives to make tablets, powders, granules or capsules, and if desired, with diluents, buffering agents, moistening agents, preservatives, coloring agents, and flavoring agents. The pharmaceutical agents may be formulated with a buffering agent to provide for protection of the compound from low pH of the gastric environment and/or an enteric coating. A pharmaceutical agent included in a pharmaceutical composition may be formulated for oral delivery with a flavoring agent, e.g., in a liquid, solid or semi-solid formulation and/or with an enteric coating.

[00304] A pharmaceutical composition comprising any one of the pharmaceutical agents described herein may be formulated for sustained or slow release, also called timed release or controlled release. Such compositions may generally be prepared using well known technology and administered by, for example, oral, rectal, intradermal, or subcutaneous implantation, or by implantation at the desired target site. Sustained-release formulations may contain the compound dispersed in a carrier matrix and/or contained within a reservoir surrounded by a rate controlling membrane. Excipients for use within such formulations are biocompatible, and may also be biodegradable; preferably the formulation provides a relatively constant level of active component release. The amount of pharmaceutical agent contained within a sustained release formulation depends upon the site of implantation, the rate and expected duration of release, and the nature of the condition, disease or disorder to be treated or prevented.

[00305] In certain embodiments, the pharmaceutical compositions comprising a

pharmaceutical agent are formulated for transdermal, intradermal, or topical administration. The compositions can be administered using a syringe, bandage, transdermal patch, insert, or syringe-like applicator, as a powder/talc or other solid, liquid, spray, aerosol, ointment, foam, cream, gel, paste. This preferably is in the form of a controlled release formulation or sustained release formulation administered topically or injected directly into the skin adjacent to or within the area to be treated, e.g., intradermally or subcutaneously. The active compositions can also be delivered via iontophoresis. Preservatives can be used to prevent the growth of fungi and other microorganisms. Suitable preservatives include, but are not limited to, benzoic acid, butylparaben, ethyl paraben, methyl paraben, propylparaben, sodium benzoate, sodium propionate, benzalkonium chloride, benzethonium chloride, benzyl alcohol, cetypyridinium chloride, chlorobutanol, phenol, phenylethyl alcohol, thimerosal, and combinations thereof.

[00306] Pharmaceutical compositions comprising a pharmaceutical agent can be formulated as emulsions for topical application. An emulsion contains one liquid distributed in the body of a second liquid. The emulsion may be an oil-in-water emulsion or a water-in-oil emulsion. Either or both of the oil phase and the aqueous phase may contain one or more surfactants, emulsifiers, emulsion stabilizers, buffers, and other excipients. The oil phase may contain other oily pharmaceutically approved excipients. Suitable surfactants include, but are not limited to, anionic surfactants, non-ionic surfactants, cationic surfactants, and amphoteric surfactants.

Compositions for topical application may also include at least one suitable suspending agent, antioxidant, chelating agent, emollient, or humectant.

[00307] Ointments and creams may, for example, be formulated with an aqueous or oily base with the addition of suitable thickening and/or gelling agents. Lotions may be formulated with an aqueous or oily base and will in general also contain one or more emulsifying agents, stabilizing agents, dispersing agents, suspending agents, thickening agents, or coloring agents. Liquid sprays may be delivered from pressurized packs, for example, via a specially shaped closure. Oil-in-water emulsions can also be used in the compositions, patches, bandages and articles. These systems are semisolid emulsions, micro-emulsions, or foam emulsion systems.

[00308] In some embodiments, the pharmaceutical agent described herein can be formulated as in inhalant. Inhaled methods can deliver medication directly to the airway. The pharmaceutical agent can be formulated as aerosols, microspheres, liposomes, or nanoparticles. The

pharmaceutical agent can be formulated with solvents, gases, nitrates, or any combinations thereof. Compositions described herein are optionally formulated for delivery as a liquid aerosol or inhalable dry powder. Liquid aerosol formulations are optionally nebulized predominantly into particle sizes that can be delivered to the terminal and respiratory bronchioles. Liquid aerosol and inhalable dry powder formulations are preferably delivered throughout the endobronchial tree to the terminal bronchioles and eventually to the parenchymal tissue.

[00309] Aerosolized formulations described herein are optionally delivered using an aerosol forming device, such as a jet, vibrating porous plate or ultrasonic nebulizer, preferably selected to allow the formation of aerosol particles having with a mass medium average diameter predominantly between 1 to 5 m. Further, the formulation preferably has balanced osmolarity ionic strength and chloride concentration, and the smallest aerosolizable volume able to deliver effective dose of the pharmaceutical agent. Additionally, the aerosolized formulation preferably does not impair negatively the functionality of the airways and does not cause undesirable side effects.

[00310] Aerosolization devices suitable for administration of aerosol formulations described herein include, for example, jet, vibrating porous plate, ultrasonic nebulizers and energized dry powder inhalers, that are able to nebulize the formulation into aerosol particle size

predominantly in the size range from 1-5 m. Predominantly in this application means that at least 70% but preferably more than 90% of all generated aerosol particles are within 1-5 m range. A jet nebulizer works by air pressure to break a liquid solution into aerosol droplets. Vibrating porous plate nebulizers work by using a sonic vacuum produced by a rapidly vibrating porous plate to extrude a solvent droplet through a porous plate. An ultrasonic nebulizer works by a piezoelectric crystal that shears a liquid into small aerosol droplets. A variety of suitable devices are available, including, for example, AeroNebTM and AeroDoseTM vibrating porous plate nebulizers (AeroGen, Inc., Sunnyvale, California), Sidestream® nebulizers (Medic-Aid Ltd., West Sussex, England), Pari LC® and Pari LC Star® jet nebulizers (Pari Respiratory

Equipment, Inc., Richmond, Virginia), and AerosonicTM (DeVilbiss Medizinische Produkte (Deutschland) GmbH, Heiden, Germany) and UltraAire® (Omron Healthcare, Inc., Vernon Hills, Illinois) ultrasonic nebulizers.

[00311] In some embodiments, the pharmaceutical agent(s) can be formulated with oleaginous bases or ointments to form a semisolid composition with a desired shape. In addition to the pharmaceutical agent, these semisolid compositions can contain dissolved and/or suspended bactericidal agents, preservatives and/or a buffer system. A petrolatum component that may be included may be any paraffin ranging in viscosity from mineral oil that incorporates isobutylene, colloidal silica, or stearate salts to paraffin waxes. Absorption bases can be used with an oleaginous system. Additives may include cholesterol, lanolin (lanolin derivatives, beeswax, fatty alcohols, wool wax alcohols, low HLB (hydrophobellipophobe balance) emulsifiers, and assorted ionic and nonionic surfactants, singularly or in combination.

[00312] Controlled or sustained release transdermal or topical formulations can be achieved by the addition of time-release additives, such as polymeric structures, matrices, that are available in the art. For example, the compositions may be administered through use of hot-melt extrusion articles, such as bioadhesive hot-melt extruded film. The formulation can comprise a cross- linked polycarboxylic acid polymer formulation. A cross-linking agent may be present in an amount that provides adequate adhesion to allow the system to remain attached to target epithelial or endothelial cell surfaces for a sufficient time to allow the desired release of the compound. [00313] An insert, transdermal patch, bandage or article can comprise a mixture or coating of polymers that provide release of the pharmaceutical agents at a constant rate over a prolonged period of time. In some embodiments, the article, transdermal patch or insert comprises water- soluble pore forming agents, such as polyethylene glycol (PEG) that can be mixed with water insoluble polymers to increase the durability of the insert and to prolong the release of the active ingredients.

[00314] Transdermal devices (inserts, patches, bandages) may also comprise a water insoluble polymer. Rate controlling polymers may be useful for administration to sites where pH change can be used to effect release. These rate controlling polymers can be applied using a continuous coating film during the process of spraying and drying with the active compound. In one embodiment, the coating formulation is used to coat pellets comprising the active ingredients that are compressed to form a solid, biodegradable insert.

[00315] A polymer formulation can also be utilized to provide controlled or sustained release. Bioadhesive polymers described in the art may be used. By way of example, a sustained-release gel and the compound may be incorporated in a polymeric matrix, such as a hydrophobic polymer matrix. Examples of a polymeric matrix include a microparticle. The microparticles can be microspheres, and the core may be of a different material than the polymeric shell.

Alternatively, the polymer may be cast as a thin slab or film, a powder produced by grinding or other standard techniques, or a gel such as a hydrogel. The polymer can also be in the form of a coating or part of a bandage, stent, catheter, vascular graft, or other device to facilitate delivery of the pharmaceutical agent. The matrices can be formed by solvent evaporation, spray drying, solvent extraction and other methods known to those skilled in the art.

[00316] Kits with unit doses of one or more of the agents described herein, usually in oral or injectable doses, are provided. Such kits may include a container containing the unit dose, an informational package insert describing the use and attendant benefits of the drugs in treating disease, and optionally an appliance or device for delivery of the composition.

D. Methods of Treatment

[00317] The compounds described herein can be used in the preparation of medicaments for the prevention or treatment of diseases or conditions. In addition, a method for treating any of the diseases or conditions described herein in a subject in need of such treatment, involves administration of pharmaceutical compositions containing at least one compound described herein, or a pharmaceutically acceptable salt, pharmaceutically acceptable prodrug, or pharmaceutically acceptable solvate thereof, in therapeutically effective amounts to said subject.

[00318] The compositions containing the compound(s) described herein can be administered for prophylactic and/or therapeutic treatments. In therapeutic applications, the compositions are administered to a patient already suffering from a disease or condition, in an amount sufficient to cure or at least partially arrest the symptoms of the disease or condition. Amounts effective for this use will depend on the severity and course of the disease or condition, previous therapy, the patient's health status, weight, and response to the drugs, and the judgment of the treating physician.

[00319] In prophylactic applications, compositions containing the compounds described herein are administered to a patient susceptible to or otherwise at risk of a particular disease, disorder or condition. Such an amount is defined to be a "prophylactically effective amount or dose." In this use, the precise amounts also depend on the patient's state of health, weight, and the like. When used in a patient, effective amounts for this use will depend on the severity and course of the disease, disorder or condition, previous therapy, the patient's health status and response to the drugs, and the judgment of the treating physician.

[00320] In the case wherein the patient’s condition does not improve, upon the doctor’s discretion the administration of the compounds may be administered chronically, that is, for an extended period of time, including throughout the duration of the patient’s life in order to ameliorate or otherwise control or limit the symptoms of the patient’s disease or condition.

[00321] Once improvement of the patient's conditions has occurred, a maintenance dose is administered if necessary. Subsequently, the dosage or the frequency of administration, or both, can be reduced, as a function of the symptoms, to a level at which the improved disease, disorder or condition is retained. Patients can, however, require intermittent treatment on a long-term basis upon any recurrence of symptoms.

[00322] The amount of a given agent that will correspond to such an amount will vary depending upon factors such as the particular compound, disease or condition and its severity, the identity (e.g., weight) of the subject or host in need of treatment, but can nevertheless be determined in a manner recognized in the field according to the particular circumstances surrounding the case, including, e.g., the specific agent being administered, the route of administration, the condition being treated, and the subject or host being treated. In general, however, doses employed for adult human treatment will typically be in the range of about 0.02 - about 5000 mg per day, in some embodiments, about 1– about 1500 mg per day. The desired dose may conveniently be presented in a single dose or as divided doses administered simultaneously (or over a short period of time) or at appropriate intervals, for example as two, three, four or more sub-doses per day.

[00323] The pharmaceutical composition described herein may be in unit dosage forms suitable for single administration of precise dosages. In unit dosage form, the formulation is divided into unit doses containing appropriate quantities of one or more compound. The unit dosage may be in the form of a package containing discrete quantities of the formulation. Non- limiting examples are packaged tablets or capsules, and powders in vials or ampoules. Aqueous suspension compositions can be packaged in single-dose non-reclosable containers.

Alternatively, multiple-dose reclosable containers can be used, in which case it is typical to include a preservative in the composition. By way of example only, formulations for parenteral injection may be presented in unit dosage form, which include, but are not limited to ampoules, or in multi-dose containers, with an added preservative.

[00324] Toxicity and therapeutic efficacy of such therapeutic regimens can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, including, but not limited to, the determination of the LD ₅₀ (the dose lethal to 50% of the population) and the ED ₅₀ (the dose therapeutically effective in 50% of the population). The dose ratio between the toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio between LD50 and ED ₅₀ . Compounds exhibiting high therapeutic indices are preferred. The data obtained from cell culture assays and animal studies can be used in formulating a range of dosage for use in human. The dosage of such compounds lies preferably within a range of circulating

concentrations that include the ED ₅₀ with minimal toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized.

[00325] In certain embodiments, the invention provides a method of treating or preventing a disease, state or condition in a patient in need thereof comprising administering to the patient an effective amount of a compound of any one of embodiments of the invention or a

pharmaceutically acceptable salt thereof. The disease, state or condition may be selected from the group consisting of neuropathic pain, vascular inflammation, arthritis, allergies, asthma, wound healing, stroke, cardiac failure, acute spinal cord injury, acute head injury or trauma, seizure, neonatal hypoxia, cerebral palsy, chronic hypoxia due to arteriovenous malformations and occlusive cerebral artery disease, ischemia and reperfusion injury in skeletal muscle, severe neurological disorders related to excitotoxicity, Parkinson's disease, Huntington's chorea, diseases of the CNS, cardiac disease, kidney disease, glaucoma, cancer, neuropathic pain, neuropathic pain associated with diabetes, transient ischemic attacks, myeloprotection, dry eye syndrome, osteoarthritis, rheumatoid arthritis, loss of skin pigmentation, inflammatory bowel disease, pulmonary inflammation, uveitis, and septic shock. In a preferred embodiment, the invention provides a method of treating or preventing neuropathic pain in a patient in need thereof. In another preferred embodiment, the invention provides a method of treating or preventing postoperative pain in a patient in need thereof.

[00326] In certain embodiments, the disclosure provides a method of treating a condition selected from chronic inflammatory conditions, chronic neuropathic pain and mixed-pain conditions, neurodegenerative conditions, cognitive impairment conditions, the unwanted side- effects of opioid analgesic therapy, congestive heart failure, myocarditis, giant cell arteritis, temporal arteritis, aortic (Takayasu's) arteritis, vasculitis, atherosclerotic vascular lesions, chronic bronchitis, chronic pancreatitis, hepatic steatohepatitis (including alcoholic and non- alcoholic types), inflammatory bowel disease (including Crohn’s disease and ulcerative colitis), inflammatory bowel syndrome, cholangitis, cholecystitis, interstitial cystitis, duodenitis, lymphadenitis, prostatitis, salpingitis, arthritis (including osteoarthritis and rheumatoid arthritis), temporomandibular joint dysfunction, myositis (including polymyositis and dermatomyositis), osteitis (including periostitis and osteomyelitis), macular degeneration (wet and dry types), glaucoma, uveitis, iritis, dry eye syndrome, and ototoxicity (deafness, hyperacusia and vestibular dysfunction) induced by drugs (including, but not limited to, platinum-containing

chemotherapeutics, aminoglycoside antibiotics and loop diuretics) and noise, trigeminal neuralgia, post-traumatic painful neuropathy (causalgia and complex regional pain syndrome), post-herpetic neuralgia, diabetic neuropathy, small fiber neuropathy, burning mouth syndrome (glossodynia), vulvodynia (including vulvovestibulitis), chemotherapy-induced peripheral neuropathy (including but not limited to neuropathy caused by chemotherapeutics in the vinca alkaloid, taxane, platinum-containing, and proteasome-inhibitor classes), spinal cord injury pain, chronic low-back pain, chronic neck pain, sciatica, discogenic pain, fibromyalgia, Alzheimer’s disease, Parkinson’s disease, Huntington’s disease, amyotrophic lateral sclerosis, Leber’s optic neuropathy, frontotemporal dementia, dementia with Lewy bodies (DLB) , spinocerebellar degeneration, multiple sclerosis, diabetic neuropathy, small fiber neuropathy, chemotherapy- induced neuropathy, traumatic brain injury (including concussions), post-operative cognitive dysfunction, chemotherapy-induced or radiation-induced damage to the oral and gastrointestinal mucosa (mucositis), hepatocellular carcinoma, adverse effects due to anti-cancer drugs, overactive bladder, pelvic pain, prostadynia, interstitial cystitis, septic shock, erectile

dysfunction, acne, dynamic wrinkles and psoriasis.

[00327] In certain embodiments, the disclosure provides a method of treating a condition selected from locomotor hyperactivity, hypertension, acute hypoxia, depression, and infertility

[00328] In certain embodiments, the disclosure provides a method of treating a condition selected from inflammatory disorders, such as vascular inflammation and arthritis, allergies, asthma, wound healing, stroke, cardiac failure, acute spinal cord injury, acute head injury or trauma, seizure, neonatal hypoxia (cerebral palsy; prophylactic treatment involves chronic exposure through placental circulation), chronic hypoxia due to arteriovenous malformations and occlusive cerebral artery disease, ischemia and reperfusion injury in skeletal muscle, severe neurological disorders related to excitotoxicity, Parkinson's disease, Huntington's chorea, and other diseases of the CNS, cardiac disease, kidney disease, and contraception.

[00329] In certain embodiments, the compounds of the invention may also be used to treat pain associated with chemotherapy-induced peripheral neuropathy (CIPN) induced by one or more combinations comprising a chemotherapeutic drug as part of a treatment regimen. Non-limiting examples of combinations include CHOPP (cyclophosphamide, doxorubicin, vincristine, prednisone, and procarbazine); CHOP (cyclophosphamide, doxorubicin, vincristine, and prednisone); COP (cyclophosphamide, vincristine, and prednisone); CAP-BOP

(cyclophosphamide, doxorubicin, procarbazine, bleomycin, vincristine, and prednisone); m- BACOD (methotrexate, bleomycin, doxorubicin, cyclophosphamide, vincristine,

dexamethasone, and leucovorin); ProMACE-MOPP (prednisone, methotrexate, doxorubicin, cyclophosphamide, etoposide, leucovorin, mechloethamine, vincristine, prednisone, and procarbazine); ProMACE-CytaBOM (prednisone, methotrexate, doxorubicin,

cyclophosphamide, etoposide, leucovorin, cytarabine, bleomycin, and vincristine); MACOP-B (methotrexate, doxorubicin, cyclophosphamide, vincristine, prednisone, bleomycin, and leucovorin); MOPP (mechloethamine, vincristine, prednisone, and procarbazine); ABVD (adriamycin/doxorubicin, bleomycin, vinblastine, and dacarbazine); MOPP (mechloethamine, vincristine, prednisone and procarbazine) alternating with ABV (adriamycin/doxorubicin, bleomycin, and vinblastine); MOPP (mechloethamine, vincristine, prednisone, and procarbazine) alternating with ABVD (adriamycin/doxorubicin, bleomycin, vinblastine, and dacarbazine); ChIVPP (chlorambucil, vinblastine, procarbazine, and prednisone); IMVP-16 (ifosfamide, methotrexate, and etoposide); MIME (methyl-gag, ifosfamide, methotrexate, and etoposide); DHAP (dexamethasone, high-dose cytaribine, and cisplatin); ESHAP (etoposide,

methylpredisolone, high-dose cytarabine, and cisplatin); CEPP(B) (cyclophosphamide, etoposide, procarbazine, prednisone, and bleomycin); CAMP (lomustine, mitoxantrone, cytarabine, and prednisone); CVP-1 (cyclophosphamide, vincristine, and prednisone), ESHOP (etoposide, methylpredisolone, high-dose cytarabine, vincristine and cisplatin); EPOCH

(etoposide, vincristine, and doxorubicin for 96 hours with bolus doses of cyclophosphamide and oral prednisone), ICE (ifosfamide, cyclophosphamide, and etoposide), CEPP(B)

(cyclophosphamide, etoposide, procarbazine, prednisone, and bleomycin), CHOP-B

(cyclophosphamide, doxorubicin, vincristine, prednisone, and bleomycin), CEPP-B

(cyclophosphamide, etoposide, procarbazine, and bleomycin), and P/DOCE (epirubicin or doxorubicin, vincristine, cyclophosphamide, and prednisone).

[00330] In certain embodiments, the method comprises administering to a subject a first amount of a compound or salt described herein in combination with a second amount of analgesic, wherein the first and second amount together comprise a pharmaceutically effective amount. The first amount, the second amount, or both may be less than effective amounts of each compound administered as monotherapies. Therapeutically effective amounts of the compound of the invention and analgesic may be administered to the subject simultaneously or separately, in any given order and by the same or different routes of administration. It may be advantageous to initiate administration of the compound of the invention first, for example one or more days or weeks prior to initiation of administration of the analgesic. Moreover, additional drugs may be given in conjunction with the above combination therapy.

[00331] In certain embodiments, the present disclosure provides a method of treating or preventing chemotherapy-induced peripheral neuropathy (CIPN) in a subject comprising administering to the subject a compound, salt, or pharmaceutical composition described herein. In some embodiments, the CIPN is due to anti-cancer chemotherapy. In some cases, the anti- cancer chemotherapy is a taxane chemotherapeutic, a platinum-complex chemotherapeutic, a vinca alkaloid chemotherapeutic, or a proteasome inhibitor chemotherapeutic. In some cases, CIPN is due to anti -viral chemotherapy In some cases, the anti -viral chemotherapy is an anti - HIV chemotherapy.

[00332] In certain embodiments, the present disclosure provides a method of treating or preventing diabetic peripheral neuropathy in a subject comprising administering to the subject a compound, salt, or pharmaceutical composition as described herein.

[00333] In certain embodiments, the present disclosure provides a method of treating or preventing neurodegeneration in a subject comprising administering to the subject a compound, salt, or pharmaceutical composition as described herein. In some cases, the neurodegeneration is due to Alzheimer's disease, Parkinson's disease, Huntington's disease, amyotrophic lateral sclerosis, or Leber's optic neuropathy.

[00334] In certain embodiments, the present disclosure provides a method of preventing or treating drug-induced ototoxicity in a subject comprising administering to the subject a compound, salt, or pharmaceutical composition described herein. In some embodiments, the drug-induced ototoxicity is deafness, tinnitus, or hyperacusia.

[00335] In certain embodiments, the present disclosure provides a method of treating or preventing spinocerebellar degeneration in a subject comprising administering to the subject a compound, salt, or pharmaceutical composition described herein.

[00336] In certain embodiments, the present disclosure provides method for treating or preventing symptoms associated with traumatic brain injury in a subject in need thereof, comprising administering to the subject a compound, salt, or pharmaceutical composition described herein. In some cases, the method comprises treating one or more symptoms associated with traumatic brain injury. In some cases, the one or more symptoms is cognitive impairment. In some cases, the cognitive impairment comprises at least one of the following: memory loss, disrupted insight, judgement, and thought, reduced processing speed, distractibility and/or deficits in executive functions such as abstract reasoning, planning, problem-solving, and multi- tasking. In some cases, the compound, salt, or pharmaceutical composition is

administered within 24 hours of a traumatic brain injury or within 48 hours of a traumatic brain injury. In some cases, the compound, salt, or pharmaceutical composition is administered in multiple doses.

[00337] In certain embodiments, the present disclosure provides a method for treating or preventing chemotherapy-induced cognitive impairment, comprising administering a compound, salt, or a pharmaceutical composition described herein to a patient undergoing or about to undergo cancer chemotherapy treatment. In some cases, the method comprises administering the compound, salt, or pharmaceutical composition prior to the cancer chemotherapy treatment. In some cases, the method comprises administering the compound, salt, or pharmaceutical composition from about one minute to about 7 days prior to the cancer chemotherapy treatment. In some cases, the method comprises administering the compound, salt, or a pharmaceutical composition simultaneously with the cancer chemotherapy treatment. In some cases, the method comprises administering the compound, salt, or pharmaceutical composition only on days when the cancer chemotherapy treatment is administered. In some embodiments, the method comprises administering the compound, salt, or pharmaceutical composition on days when the cancer chemotherapy treatment is administered and on one or more of those days intervening between successive doses of the chemotherapeutic. In some cases, the method comprises administering the compound, salt, or pharmaceutical composition after the cancer chemotherapy treatment. In some cases, the method comprises administering the compound, salt, or pharmaceutical composition from about one minute to about 7 days after the cancer

chemotherapy treatment. In some cases, the cancer chemotherapy treatment is selected from the group consisting of taxane agents, platinum-complex agents, vinca alkaloids, proteasome inhibitors, 5-fluorouracil, methotrexate, doxorubicin, and combinations thereof.

[00338] In certain embodiments, the present disclosure provides a method for treating pain and discomfort of Irritable Bowel Syndrome comprising administering a compound, salt, or a pharmaceutical composition described herein to a patient undergoing or about to undergo cancer chemotherapy treatment. In some cases, the method comprises administering before the onset of pain or discomfort. In some cases, the method comprises administering after the onset of pain or discomfort. In some cases, the method comprises administering during the onset of pain or discomfort. In some cases, the pain or discomfort is reduced by at least about 10% as determined by an abdominal measurement to colorectal distension measurement. In some cases, the pain or discomfort is reduced by at least about 50%. In some cases, the pain or discomfort is reduced by at least about 90%. In some cases, the pain or discomfort is reduced by at least about 10% as determined by viscero-motor to colorectal distension measurement. In some cases, thepain or discomfort is reduced by at least 50%. In some cases, the pain or discomfort is reduced by at least 90%. In some cases, administering is performed at least 5 days after the onset of pain or discomfort.

[00339] In certain embodiments, a compound or salt of the disclosure administered with an analgesic may be used to alleviate the symptoms of neuropathic pain regardless of the cause of the pain, for example, but not limited to, spinal cord injury, multiple sclerosis, stroke, diabetes, herpes zoster infection, HIV-related neuropathies, nutritional deficiencies, toxins, remote manifestations of malignancies, genetic, immune mediated disorders or physical trauma to a nerve trunk, cancer, chemotherapy, radiation injury or surgery (e.g., postoperative pain), vulvodynia, and burning mouth syndrome. In an embodiment, the neuropathic pain is associated with chronic use of opioids.

[00340] The analgesic administered in conjunction with the compound or of the invention may be selected in relation to the particular condition being treated. Currently known analgesics include, but are not limited to, opioids, morphinomimetics, antidepressants, antiepileptics, NMDA receptor antagonists, fatty acid amine hydrolyase inhibitors, anticonvulsives, non- steroidal anti-inflammatory drugs (NSAIDs), COX-2 inhibitors, NOS inhibitors, acetaminophen, and calcium channel subunit a2d ligands.

[00341] Example opioids include any natural or synthetic opioid analgesic, such as morphine, fentanyl, codeine, thebaine, diacetylmorphine (heroin), dihydrocodeine, hydrocodone, hydromorphone, nicomorphine, oxycodone, oxymorphone, alphamethylfentanyl, alfentanil, sufentanil, remifentanil, carfentanyl, ohmefentanyl, nocaine, pethidine (meperidine),

ketobemidone, MPPP, allylprodine, prodine, PEPAP, propoxyphene, dextropropoxyphene, dextromoramide, bezitramide, piritramide, methadone, dipipanone, levoalphacetylmethadol (LAAM), loperamide, diphenoxylate, pentazocine, phenazocine, buprenorphine, etorphine, butorphanol, nalbuphine, levorphanol, levomethorphan, dezocine, lefetamine, tilidine, tramadol, propoxyphene, and oxycodone. As intended herein, an opioid also encompasses any natural or synthetic narcotic antagonist such as nalmefene, naloxone or naltrexone as well as any natural or synthetic mixed opioid agonist/antagonist such as nalbuphine, butorphanol, buprenorphine and pentazocine.

[00342] Example non-steroidal anti-inflammatory drugs (NSAIDs) include aspirin, ibuprofen, acetaminophen, naproxen, fenoprofen, ketoprofen, flurbiprofen, oxaprozin, indomethacin, sulindac, etodolac, ketorolac, diclofenac, nabumetone, piroxicam, meloxicam, tenoxicam, droxicam, lornoxicam, isoxicam, mefenamic acid, meclofenamic acid, flufenamic acid, tolfenamic acid, celecoxib, rofecoxib, valdecoxib, parecoxib, lumiracoxib, etoricoxib, firocoxib, nimesulide, and licofelone. Example antidepressants include tricyclic antidepressants such as: amitriptyline, amitriptylinoxide, butriptyline, clomipramine, demexiptiline, desipramine, dibenzepin, dimetacrine, dosulepin, doxepin, imipramine, imipraminoxide, lofepramine, melitracen, metapramine, nitroxazepine, nortriptyline, noxiptiline, pipofezine, propizepine, protriptyline, and quinupramine; amineptine, norepinephrine, iprindole, opipramol, tianeptine, trimipramine, carbamezapine, and flupirtine.

[00343] It is contemplated that a compound or salt of the invention may be especially suited to the treatment of pain when co-administered with an opioid, a tricyclic antidepressant, or an analgesic believed to bind the calcium channel subunit a2d, i.e. a calcium channel subunit a2d ligand. Examples of such ligands include GABA analogs, such as gabapentin (2-[1- (aminomethyl)cyclohexyl]acetic acid) and pregabalin ((S)-3-(aminomethyl)-5-methylhexanoic acid).

[00344] In certain embodiments, the method comprises administering to a subject a first amount of a compound or salt described herein in combination with a second amount of a dopamine agonist, e.g., carbidopa or levodopa.

[00345] The relative amounts of the compounds or salts thereof may be selected to provide for synergistic pain relief. For example, a suitable ratio of a compound of the invention to gabapentin may be in the range of from about 0.1 part by weight of the compound to from about 3 to about 30 parts by weight of the gabapentin. A suitable ratio of a compound of the invention to morphine may be in the range of from about 0.1 part by weight of the compound to from about 1 to about 5 parts by weight of the morphine. While these ratios are calculated with respect to the free compounds (non-salt forms), it should be understood that the equivalent ratios can also readily be determined for pharmaceutically acceptable salts or prodrugs of the compounds by using a ratio of the molecular weights of the salts.

[00346] In certain embodiments, co-administration of the compound of the invention and analgesic is achieved by formulating the compounds together in a combination composition. The combination composition may comprise a first pharmaceutically acceptable composition containing a first amount of a compound of the invention, and a second pharmaceutically acceptable composition comprising a second amount of an analgesic, wherein the first and second amounts taken together comprise a pharmaceutically effective amount. The first amount, the second amount, or both may be less than effective amounts of each compound administered as monotherapies. The combination composition is a pharmaceutically acceptable composition comprising a first amount of a compound or salt of the invention and a second amount of an analgesic, wherein the first and second amounts taken together comprise a pharmaceutically effective amount. The first amount, the second amount, or both may be less than effective amounts of each compound administered as monotherapies.

[00347] In an embodiment, the invention provides a method of reducing opioid antinociceptive tolerance and/or hypersensitivity in a subject receiving opioid therapy comprising administering to the subject an amount of a compound or salt of the invention sufficient to reduce opioid antinociceptive tolerance.

[00348] In another embodiment, there is provided a method of preventing or treating opioid dependence, i.e., withdrawal in a subject receiving opiates, comprising administering to the subject an amount of a compound or salt of the invention sufficient to treat one or more symptoms of opioid withdrawal. The opioid may be morphine, oxycodone, fentanyl, cocaine herion, or opium. The compound or salt of the invention may be delivered prior to initiating withdrawal or after initiating withdrawal. The compound or salt of the invention may be co- administered with a decreasing dosage of opioid. The compound or salt of the invention may be delivered prior to beginning opioid therapy. The compound or salt of the invention may be delivered for a period of time after the opioid is no longer administered to the subject. The compound or salt of the invention may be delivered over a period of one week, two weeks, three weeks, four weeks, one month, two months, three months, four months, five months, or six months after the opiate is no longer administered to the subject. The opioid and/or the compound or salt of the invention may be delivered by continuous infusion, such as by an implanted pump.

[00349] The one or more symptoms of opioid withdrawal may comprise agitation, anxiety, muscle ache, increased tearing, insomnia, runny nose, sweating, and yawning, while late symptoms of withdrawal include abdominal cramping, diarrhea, dilated pupils, goose bumps, nausea and/or vomiting. The method may further comprise subjecting the subject to a drug treatment program, such as methadone treatment or buprenorphine treatment.

[00350] In other embodiments, the compound or salt of the invention is administered in conjunction with agents such as TNF-a inhibitors, IL-1b inhibitors, p38 kinase inhibitors, ERK inhibitors, JNK inhibitors, modulators of transcription factors such as NF-kB, agents that modulate glial cell function, agents that block expression and/or activity of adenosine kinase, recombinant ectonucleotidases, ENT inhibitors, and the like. Non-limiting examples of p38 kinase inhibitors include PH-797804, BIRB 796, VX-702, SB 239063, SB202190, SCIO 469, and BMS 582949. An example of an ERK inhibitor is sorafenib. An example of a JNK inhibitor is AM-111. Non-limiting examples of NF-kB modulators include disulfiram, olmesartan, dithiocarbamates, and anatabine. [00351] The following examples further illustrate the invention but, of course, should not be construed as in any way limiting its scope. EXAMPLES

[00352] The invention now being generally described, it will be more readily understood by reference to the following examples which are included merely for purposes of illustration of certain aspects and embodiments of the present invention, and are not intended to limit the invention in any way.

[00353] The following synthetic schemes are provided for purposes of illustration, not limitation. The following examples illustrate the various methods of making compounds described herein. It is understood that one skilled in the art may be able to make these compounds by similar methods or by combining other methods known to one skilled in the art. It is also understood that one skilled in the art would be able to make, in a similar manner as described below by using the appropriate starting materials and modifying the synthetic route as needed. In general, starting materials and reagents can be obtained from commercial vendors or synthesized according to sources known to those skilled in the art or prepared as described herein. Illustrative Synthetic Schemes

[00354] The compounds and salts of Formulas (I)–(V) can be synthesized according to one or more illustrative schemes herein and/or techniques known in the art. Materials used herein are either commercially available or prepared by synthetic methods generally known in the art. These schemes are not limited to the compounds listed in the examples or by any particular substituents, which are employed for illustrative purposes. Although various steps are described in the Schemes below, the steps in some cases may be performed in a different order than shown. Numberings or R groups in each scheme do not necessarily correspond to that of the claims or other schemes or tables herein.

[00355] Examples 1–17 show exemplary procedures for the preparation of the claimed A ₃ receptor agonists.

Example 1: Preparation of (3aS,4S,6R,6aR)-6-(6-(cyclobutylamino)-2-iodo-9H-purin-9-yl) - N,2,2-trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxami de (1.3)

[00356] A solution of 3 g (6.25 mmol, 1 eq) of Int.I (WO ₂ 003061670), cyclobutanamine (533.7 mg, 7.51 mmol, 643.12 mL, 1.20 eq) in t-BuOH (30 mL), was added TEA (3.16 g, 31.27 mmol, 4.35 mL, 5 eq) at 25°C.The mixture was stirred at 65°C for 1.5hr. TLC analysis showed the starting material was consumed completely. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by chromatography (SiO ₂ , petroleum ether/ethyl acetate=50/1 to 0/1) to give compound 1.3 (2.7 g, 5.25 mmol, 83.9% yield) as a yellow solid, which was used without further purification. ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.48 (d, J = 7.9 Hz, 1H), 8.16 (s, 1H), 7.52-7.42 (m, J = 4.8 Hz, 1H), 6.24 (d, J = 1.2 Hz, 1H), 5.37-5.20 (m, 2H), 4.54 (d, J = 1.6 Hz, 2H), 2.38 (d, J = 4.4 Hz, 3H), 2.32-2.22 (m, 4H), 1.70-1.60 (m, 2H), 1.53 (s, 3H), 1.33 (s, 3H)

[00357] Similarly prepared by the method of Example 1 were the additional compounds listed below:

● (3aS,4S,6R,6aR)-6-(6-(cyclopropylamino)-2-iodo-9H-purin-9-yl )-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.4) by using cyclopropyl amine as cyclobutanamine; MS: 501.0 (M+H), ¹ H NMR: 400 MHz CDCl3 d (ppm) 7.68 (s, 1H), 6.97 (s, 1H), 5.92 (d, J = 2.8 Hz, 2H), 5.25-5.20 (m, 2H), 4.70 (s, 1H), 2.90 (t, J = 6.4 Hz, 3H), 1.71 (s, 1H), 1.63 (s, 3H), 1.38 (s, 3H), 0.95-0.92 (m, 2H), 0.67-0.63 (m, 2H);

● (3aS,4S,6R,6aR)-6-(6-((2,2-difluoroethyl)amino)-2-iodo-9H-pu rin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.5) by using 2,2- difluoroethylamine as cyclobutanamine; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.46 (s, 1H), 8.25 (s, 1H), 7.49 (d, J = 4.8 Hz, 1H), 6.30-6.01 (m, 2H), 5.33-5.29 (m, 2H), 4.56 (s, 1H), 3.82 (s, 2H), 2.37 (d, J = 4.4 Hz, 3H), 1.53 (s, 3H), 1.34 (s, 3H);

● (3aS,4S,6R,6aR)-6-(6-(ethylamino)-2-iodo-9H-purin-9-yl)-N,2, 2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.6) using ethyl amine as cyclobutanamine; MS: 489 (M+H); ● (3aS,4S,6R,6aR)-6-(2-iodo-6-(methylamino)-9H-purin-9-yl)-N,2 ,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.7) using methylamine as cyclobutanamine; MS 475 (M + H);

● (3aS,4S,6R,6aR)-6-(2-iodo-6-(propylamino)-9H-purin-9-yl)-N,2 ,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.8); MS 503 (M+H);

● (3aS,4S,6R,6aR)-6-(6-((2,2-difluoropropyl)amino)-2-iodo-9H-p urin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.9) using 2,2- difluoropropylamine as cyclobutanamine; MS: 539 (M+H); ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.48 (br s, 1H), 8.23 (s, 1H), 7.46 (d, J = 4.4 Hz, 1H), 6.28 (s, 1H), 5.36-5.25 (m, 2H), 4.55 (d, J=1.6 Hz, 1H), 3.97-3.79 (m, 2H), 2.36 (d, J = 4.4 Hz, 3H), 1.61 (t, J = 20 Hz, 3H), 1.53 (s, 3H), 1.34 (s, 3H)

● (3aS,4S,6R,6aR)-6-(6-(ethoxyamino)-2-iodo-9H-purin-9-yl)-N,2 ,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.10) using ethoxyamine as cyclobutanamine; MS 505 (M + H);

● (3aS,4S,6R,6aR)-6-(2-iodo-6-((1-methylazetidin-3-yl)amino)-9 H-purin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.11) using 1-methylazetidine-1- amine as cyclobutanamine; MS 530 (M +H);

● (3aS,4S,6R,6aR)-6-(2-iodo-6-(((3-methylisoxazol-5-yl)methyl) amino)-9H-purin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.12) using (3-methylisoxazol-5- yl)methanamine as cyclobutanamine; MS: 556 (M+H); ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.77 (s, 1H), 8.22 (s, 1H), 7.48 (t, J = 4.8 Hz, 1H), 6.27 (s, 1H), 6.15 (s, 1H), 5.34- 5.29 (m, 2H), 4.69 (s, 2H), 4.56 (d, J = 1.6 Hz, 1H), 2.36 (d, J = 4.8 Hz, 3H), 2.18 (s, 3H) 1.53 (s, 3H), 1.34 (s, 3H)

● (3aS,4S,6R,6aR)-6-(6-((3-chlorobenzyl)amino)-2-iodo-9H-purin -9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.13) using 3-chlorobenzylamine for cyclobutanamine; MS 586 (M +H);

Example 2: Preparation of (3aS,4S,6R,6aR)-6-(2-azido-6-(cyclobutylamino)-9H-purin-9- yl)-N,2,2-trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carbo xamide (1.14)

[00358] A solution of compound 1.3 (1.5 g, 2.92 mmol, 1 eq) in DMSO (10 mL) and H2O (2 mL) was added sodium L-ascorbate (57.7 mg, 291.65 umol, 0.1 eq), NaN ₃ (214 mg, 3.29 mmol, 1.13 eq), (1R,2R)-N ¹ ,N ² -dimethylcyclohexane-1,2-diamine (62.2 mg, 437.47 umol, 0.15 eq) and CuI (55.5 mg, 291.65 umol, 0.1 eq) at 25°C. The resulting mixture was stirred at 25°C for 0.5 hr. LCMS analysis showed the starting material was consumed completely. The reaction mixture was diluted with H ₂ O (30 mL) and extracted with three 30-mL portions of EtOAc. The combined organic extract was washed with 50-mL brine, was dried over Na2SO4, was filtered and was concentrated under reduced pressure to give a residue. The aqueous layer was quenched with aq. NaClO, and was discarded. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ethyl acetate=50/1 to 0/1) to give compound 1.14 (800 mg, 1.86 mmol, 63.8% yield) as yellow solid. MS: 430 (M+H).

[00359] The following compounds were prepared using the method of Example 2 and substituting the compounds of Table 1 for 1.3:

● (3aS,4S,6R,6aR)-6-(2-azido-6-(cyclopropylamino)-9H-purin-9-y l)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.15); MS 416 (M+H);

● (3aS,4S,6R,6aR)-6-(2-azido-6-((2,2-difluoroethyl)amino)-9H-p urin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.16); MS 440 (M+H);

● ((3aS,4S,6R,6aR)-6-(2-azido-6-(ethylamino)-9H-purin-9-yl)-N, 2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.17); MS 404 (M+H);

● (3aS,4S,6R,6aR)-6-(2-azido-6-(methylamino)-9H-purin-9-yl)-N, 2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.18); MS 390 (M+H);

● (3aS,4S,6R,6aR)-6-(2-azido-6-(propylamino)-9H-purin-9-yl)-N, 2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.19); MS 418 (M+H);

● (3aS,4S,6R,6aR)-6-(2-azido-6-((2,2-difluoropropyl)amino)-9H- purin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.20); MS 454 (M+H);

● (3aS,4S,6R,6aR)-6-(2-azido-6-(ethoxyamino)-9H-purin-9-yl)-N, 2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.21); MS 420 (M+H); ● (3aS,4S,6R,6aR)-6-(2-azido-6-((1-methylazetidin-3-yl)amino)- 9H-purin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.22); MS 445 (M+H);

● (3aS,4S,6R,6aR)-6-(2-azido-6-(((3-methylisoxazol-5-yl)methyl )amino)-9H-purin-9-yl)- N,2,2-trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxami de (1.23); MS 471 (M+H); ● (3aS,4S,6R,6aR)-6-(2-azido-6-((3-chlorobenzyl)amino)-9H-puri n-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (1.24); MS 501 (M+H).

Example 3: Preparation of (2S,3S,4R,5R)-5-(6-(cyclobutylamino)-2-(4-(pyridin-2-yl)-1H- 1,2,3-triazol-1-yl)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltet rahydrofuran-2-carboxamide

(1.25). Step-1

[00360] A solution of compound 1.14 (200 mg, 465.73 umol, 1 eq), ethynylpyridine (57.6 mg, 558.88 umol, 56.50 uL, 1.2 eq) in MeOH (2.5 mL) and H2O (2.5 mL), was added sodium L- ascorbate (46.1 mg, 232.87 mmol, 0.5 eq), CuSO4 (5.9 mg, 37.26 mmol, 5.72 uL, 0.08 eq) at 25°C. The resulting mixture was stirred at 25°C for 12 hr. LCMS analysis showed the starting material was consumed completely. The reaction mixture was diluted with H ₂ O (30 mL) and extracted with three 30-mL portions of EtOAc. The combined organic extract was washed with brine (50 mL), was dried over Na2SO4, was filtered, was concentrated in vacuo and was purified by prep-TLC (SiO ₂ , EtOAc:MeOH=10/1 ) to give compound Int.1-A (200 mg, 375.55 mmol l, (80.6% yield) as yellow oil; MS: 533 (M+H); ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 9.20 (s, 1H), 8.84-8.74 (m, 1H), 8.70 (d, J = 4.4 Hz, 1H), 8.37 (s, 1H), 8.14 (s, 1H), 7.96 (s, 1H), 7.55- 7.47 (m, 1H), 7.46-7.36 (m, 1H), 6.45 (s, 1H), 5.58-5.52 (m, J = 6.0 Hz, 1H), 5.43 (d, J = 5.6 Hz, 1H), 4.62 (s, 1H), 2.39-2.09 (m, 8H), 1.78-1.65 (m, J = 2.4 Hz, 2H), 1.55 (s, 3H), 1.35 (s, 3H). Step-2

[00361] A mixture of compound Int.1-A (200 mg, 375.55 umol, 1 eq) in 80% aq.TFA (375.55 umol, 5 mL, 1 eq) was stirred at 25°C for 1 hr. LCMS analysis showed the starting material was consumed completely. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Waters Xbridge Prep OBD C18150x40mmx10 mm;mobile phase: [water(0.05%NH3H2O+10mM NH4HCO3)- ACN];B%: 20%-65%,8min) to give compound 1.25 as white solid; MS: 493.2 (M+H); ¹ H NMR 400 MHz DMSO-d ₆ d (ppm) 9.14 (s, 1H), 8.83 (d, J = 7.6 Hz, 1H), 8.68 (d, J = 4.0 Hz, 1H), 8.60 (s, 1H), 8.16 (d, J = 7.6 Hz, 1H), 8.09-8.01 (m, 1H), 7.98-7.91 (m, 1H), 7.46-7.38 (m, 1H), 6.06 (d, J = 7.2 Hz, 1H), 5.73 (d, J = 4.4 Hz, 1H), 5.62 (d, J = 6.4 Hz, 1H), 4.87-4.82 (m, 1H), 4.80-4.71 (m, 1H), 4.36 (d, J = 2.0 Hz, 1H), 4.25 (s, 1H), 2.64 (d, J = 4.4 Hz, 3H), 2.40-2.29 (m, 2H), 2.23 (d, J = 9.6 Hz, 2H), 1.83-1.67 (m, 2H).

[00362] The following compounds were prepared using the method of Example 3 and substituting the appropriate alkyne for ethynylpyridine in Step-1:

● Substituting prop-2-yn-1-ylcyclopropane for ethynylpyridine gave (2S,3S,4R,5R)-5-(6- (cyclobutylamino)-2-(4-(cyclopropylmethyl)-1H-1,2,3-triazol- 1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.26); MS 470 (M+H);

● Substituting trimethylsilylacetylene for ethynylpyridine followed by desilylation with tetra- n-butylammonium fluoride (TBAF) (rt, overnight) gave (2S,3S,4R,5R)-5-(6- (cyclobutylamino)-2-(1H-1,2,3-triazol-1-yl)-9H-purin-9-yl)-3 ,4-dihydroxy-N- methyltetrahydrofuran-2-carboxamide (1.27); MS 416 (M+H).

Example 4: Preparation of (2S,3S,4R,5R)-5-(6-(cyclopropylamino)-2-(4-methyl-1H-1,2,3- triazol-1-yl)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydr ofuran-2-carboxamide (1.28).

Step-1

[00363] The mixture of compound 1.15 (300 mg, 722.2 mmol, 1.0 eq), a solution of propyne in MeOH (~1.8 M, 5 mL, ~12 eq) and H ₂ O (5 mL) was added CuSO ₄ (9.22 mg, 57.8 mmol, 8.87 mL, 0.08 eq) and sodium L-ascorbate (71.5 mg, 361.1 mmol, 0.5 eq) at 25°C. The mixture was stirred at 25 °C for 64 hrs. LC-MS showed 15/2 = 1/1. The mixture was partitioned between EtOAc (10 mL x 3) and H2O (20 mL). The organic phase was separated, washed with sat. NaCl (10 mL), dried over Na2SO4, filtered and concentrated under reduced pressure to give a residue. The residue was purified by Prep-TLC (DCM:MeOH = 10:1) to give compound Int.1-B as yellow solid; MS: 456 (M+H); ¹ H NMR 400 MHz CDCl3 d (ppm) 8.35 (s, 1H), 7.84 (s, 1H), 6.14 (s, 1H), 7.09 (s, 1H), 6.05 (s, 1H), 5.35 (s, 2H), 4.75 (d, J = 1.2 Hz, 1H), 3.17 (s, 1H), 2.68 (s, 3H), 2.48 (s, 3H), 1.64 (s, 3H), 1.39 (s, 3H), 1.03-0.99 (m, 2H), 0.74-0.71 (m, 2H).

Step-2

Int.1-B 1.28

[00364] Compound Int.1-B (70 mg, 153.7 umol, 1.0 eq) was dissolved in 80% aq. TFA (2 mL) and stirred at 25°C for 2 hrs. LC-MS showed reaction completed. The mixture was concentrated under reduced pressure. The residue was purified by Pre-HPLC (column: Waters Xbridge Prep OBD C18150x40mmx10 mm; mobile phase: [water (0.05%NH3H2O+10mM NH4HCO3)-ACN]; B%: 15%-35%, 8min) to obtain 1.28 as white solid; MS 416 (M+H); ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.61 (s, 1H), 8.54 (s, 2H), 8.05 (s, 1H), 6.03 (d, J = 7.2 Hz, 1H), 5.72 (d, J = 4.8 Hz, 1H), 5.60 (d, J = 6.4 Hz, 1H), 34.75-4.71 (m, 1H), 4.35 (d, J = 2.0 Hz, 1H), 4.25 (s, 1H), 3.18 (s, 1H), 2.63 (d, J = 4.4 Hz, 3H), 2.35 (s, 3H), 0.82-0.79 (m, 2H), 0.73- 0.69 (m, 2H).

[00365] The following compounds were prepared using the method of Example 4 and substituting the appropriate alkyne for propyne in Step-1:

● Substituting 2-ethynylpyridine for propyne gave (2S,3S,4R,5R)-5-(6-(cyclopropylamino)-2- (4-(pyridin-2-yl)-1H-1,2,3-triazol-1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N- methyltetrahydrofuran-2-carboxamide (1.29); MS 479 (M+H);

● Substituting trimethylsilylacetylene for propyne followed by desilylation with TBAF (rt, overnight) gave (2S,3S,4R,5R)-5-(6-(cyclopropylamino)-2-(1H-1,2,3-triazol-1- yl)-9H-purin- 9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.30); MS 402 (M+H).

[00366] The following compounds were prepared using the method of Example 4

substituting azide 1.16 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1:

● Substituting ethynylcyclopropane for propyne gave (2S,3S,4R,5R)-5-(2-(4-cyclopropyl-1H- 1,2,3-triazol-1-yl)-6-((2,2-difluoroethyl)amino)-9H-purin-9- yl)-3,4-dihydroxy-N- methyltetrahydrofuran-2-carboxamide (1.31); MS 466 (M+H);

● Substituting trimethylsilylacetylene for propyne followed by desilylation with TBAF (rt, overnight) gave (2S,3S,4R,5R)-5-(6-((2,2-difluoroethyl)amino)-2-(1H-1,2,3-tr iazol-1-yl)- 9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carbo xamide (1.32); MS 426 (M+H);

● Substituting 4-methoxybut-1-yne for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoroethyl)amino)-2-(4-(2-methoxyethyl)-1H-1,2,3-triazol- 1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.33); MS 484 (M+H); ● Using propyne gave (2S,3S,4R,5R)-5-(6-((2,2-difluoroethyl)amino)-2-(4-methyl-1H -1,2,3- triazol-1-yl)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydr ofuran-2-carboxamide (1.34); MS 440 (M+H);

● Substituting 2-ethynylpyridine for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoroethyl)amino)-2-(4-(pyridin-2-yl)-1H-1,2,3-triazol-1- yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.35); MS 503 (M+H);

● Substituting 2-ethynylpyridazine for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoroethyl)amino)-2-(4-(pyridazin-3-yl)-1H-1,2,3-triazol- 1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.36); MS 504 (M+H).

[00367] The following compounds were prepared using the method of Example 4

substituting azide 1.17 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1:

● Substituting 2-ethynylpyridine for propyne gave (2S,3S,4R,5R)-5-(6-(ethylamino)-2-(4- (pyridin-2-yl)-1H-1,2,3-triazol-1-yl)-9H-purin-9-yl)-3,4-dih ydroxy-N- methyltetrahydrofuran-2-carboxamide (1.37); MS 467 (M+H);

● Substituting 2-ethynylpyridazine for propyne gave (2S,3S,4R,5R)-5-(6-(ethylamino)-2-(4- (pyridazin-3-yl)-1H-1,2,3-triazol-1-yl)-9H-purin-9-yl)-3,4-d ihydroxy-N- methyltetrahydrofuran-2-carboxamide (1.38); MS 468 (M+H). [00368] The following compounds were prepared using the method of Example 4

substituting azide 1.18 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1:

● Substituting ethynylcyclopropane for propyne gave (2S,3S,4R,5R)-5-(2-(4-cyclopropyl-1H- 1,2,3-triazol-1-yl)-6-(methylamino)-9H-purin-9-yl)-3,4-dihyd roxy-N-methyltetrahydrofuran- 2-carboxamide (1.39); MS 416 (M+H)

● Substituting 2-ethynylpyridine for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5- (6-(methylamino)-2-(4-(pyridin-2-yl)-1H-1,2,3-triazol-1-yl)- 9H-purin-9-yl)tetrahydrofuran- 2-carboxamide (1.40); MS 453 (M+H).

[00369] The following compounds were prepared using the method of Example 4

substituting azide 1.19 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1:

● Substituting ethynylcyclopropane for propyne gave (2S,3S,4R,5R)-5-(2-(4-cyclopropyl-1H- 1,2,3-triazol-1-yl)-6-(propylamino)-9H-purin-9-yl)-3,4-dihyd roxy-N-methyltetrahydrofuran- 2-carboxamide (1.41); MS 444 (M+H);

● Substituting 2-ethynylpyrazine for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5- (6-(propylamino)-2-(4-(pyrazin-2-yl)-1H-1,2,3-triazol-1-yl)- 9H-purin-9-yl)tetrahydrofuran- 2-carboxamide (1.42); (MS 482 (M+H);

● Substituting 3-methoxyphenylacetylene for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-5- (2-(4-(3-methoxyphenyl)-1H-1,2,3-triazol-1-yl)-6-(propylamin o)-9H-purin-9-yl)-N- methyltetrahydrofuran-2-carboxamide (1.43); MS 510 (M+H); ● Substituting 3-ethynylpyridazine for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl- 5-(6-(propylamino)-2-(4-(pyridazin-3-yl)-1H-1,2,3-triazol-1- yl)-9H-purin-9- yl)tetrahydrofuran-2-carboxamide (1.44); MS 482 (M+H);

● Substituting 2-ethynylpyridine for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5- (6-(propylamino)-2-(4-(pyridin-2-yl)-1H-1,2,3-triazol-1-yl)- 9H-purin-9-yl)tetrahydrofuran- 2-carboxamide (1.45); MS 481 (M+H);

● Substituting 4-methoxybutyne for propyne gave (2R,3S,4R,5R)-3,4-dihydroxy-5-(2-(4-(2- methoxyethyl)-1H-1,2,3-triazol-1-yl)-6-(propylamino)-9H-puri n-9-yl)-N- methyltetrahydrofuran-2-carboxamide (1.46); MS 462 (M+H);

● Substituting 3-phenylpropyne for propyne gave (2R,3S,4R,5R)-5-(2-(4-benzyl-1H-1,2,3- triazol-1-yl)-6-(propylamino)-9H-purin-9-yl)-3,4-dihydroxy-N -methyltetrahydrofuran-2- carboxamide (1.47); MS 494 (M+H);

● Substituting 3,3-difluorobutyne for propyne gave (2S,3S,4R,5R)-5-(2-(4-(1,1-difluoroethyl)- 1H-1,2,3-triazol-1-yl)-6-(propylamino)-9H-purin-9-yl)-3,4-di hydroxy-N- methyltetrahydrofuran-2-carboxamide (1.48); MS 468 (M+H);

● Substituting 4-methoxy-2-ethynylpyridine for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-5- (2-(4-(4-methoxypyridin-2-yl)-1H-1,2,3-triazol-1-yl)-6-(prop ylamino)-9H-purin-9-yl)-N- methyltetrahydrofuran-2-carboxamide (1.49); MS 511 (M+H).

[00370] The following compounds were prepared using the method of Example 4

substituting azide 1.20 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1:

● Substituting 4-methoxybutyne for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoropropyl)amino)-2-(4-(2-methoxyethyl)-1H-1,2,3-triazol -1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.50); MS 498 (M+H);

● Substituting 3-ethynylpyridazine for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoropropyl)amino)-2-(4-(pyridazin-3-yl)-1H-1,2,3-triazol -1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.51); MS 518 (M+H);

● Substituting 3,4-difluorophenylacetylene for propyne gave (2S,3S,4R,5R)-5-(2-(4-(3,4- difluorophenyl)-1H-1,2,3-triazol-1-yl)-6-((2,2-difluoropropy l)amino)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.52); MS 552 (M+H);

● Substituting 3-phenylpropyne for propyne gave (2S,3S,4R,5R)-5-(2-(4-benzyl-1H-1,2,3- triazol-1-yl)-6-((2,2-difluoropropyl)amino)-9H-purin-9-yl)-3 ,4-dihydroxy-N- methyltetrahydrofuran-2-carboxamide (1.53); MS 530 M+H); ● Substituting 4-ethynylpyridine for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoropropyl)amino)-2-(4-(pyridin-4-yl)-1H-1,2,3-triazol-1 -yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.54); MS 517 (M+H);

● Substituting prop-2-yn-1-ylcyclopropane for propyne gave (2S,3S,4R,5R)-5-(2-(4- (cyclopropylmethyl)-1H-1,2,3-triazol-1-yl)-6-((2,2-difluorop ropyl)amino)-9H-purin-9-yl)- 3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.55); MS 494 (M+H);

● Substituting 3-ethynylpyridine for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoropropyl)amino)-2-(4-(pyridin-3-yl)-1H-1,2,3-triazol-1 -yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.56); MS 517 (M+H);

● (2S,3S,4R,5R)-5-(6-((2,2-difluoropropyl)amino)-2-(4-(3-(meth ylthio)phenyl)-1H-1,2,3- triazol-1-yl)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydr ofuran-2-carboxamide (1.57); MS 562 (M+H);

● Substituting 2-ethynylpyridine for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoropropyl)amino)-2-(4-(pyridin-2-yl)-1H-1,2,3-triazol-1 -yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.58); MS 517 (M+H);

● Substituting 4-fluorophenylacetylene for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoropropyl)amino)-2-(4-(4-fluorophenyl)-1H-1,2,3-triazol -1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.59); MS 534 (M+H);

● Substituting 5,5,5-trifluoropent-1-yne for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoropropyl)amino)-2-(4-(3,3,3-trifluoropropyl)-1H-1,2,3- triazol-1-yl)-9H-purin-9-yl)- 3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.60); MS 536 (M+H);

● Substituting 4,4-difluorohex-1-yne for propyne gave (2S,3S,4R,5R)-5-(2-(4-(2,2- difluorobutyl)-1H-1,2,3-triazol-1-yl)-6-((2,2-difluoropropyl )amino)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.61); MS (M+H);

● Substituting 3-methoxyphenylacetylene for propyne gave (2S,3S,4R,5R)-5-(6-((2,2- difluoropropyl)amino)-2-(4-(3-methoxyphenyl)-1H-1,2,3-triazo l-1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.62); MS 546 (M+H).

[00371] The following compound was prepared using the method of Example 4 substituting azide 1.21 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1: ● Using 3-methoxyphenylacetylene for propyne gave (2S,3S,4R,5R)-5-(6-(ethoxyamino)-2-(4- (3-methoxyphenyl)-1H-1,2,3-triazol-1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N- methyltetrahydrofuran-2-carboxamide (1.63); MS 512 (M+H).

[00372] The following compound was prepared using the method of Example 4 substituting azide 1.22 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1:

● Using 3-methoxyphenylacetylene for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-5-(2-(4-(3- methoxyphenyl)-1H-1,2,3-triazol-1-yl)-6-((1-methylazetidin-3 -yl)amino)-9H-purin-9-yl)-N- methyltetrahydrofuran-2-carboxamide (1.64); MS 537 (M+H).

[00373] The following compounds were prepared using the method of Example 4

substituting azide 1.23 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1:

● Substituting trimethylsilylacetylene for propyne followed by desilylation with TBAF (rt, overnight) gave (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(6-(((3-methylisoxazo l-5- yl)methyl)amino)-2-(1H-1,2,3-triazol-1-yl)-9H-purin-9-yl)tet rahydrofuran-2-carboxamide (1.65); MS 457 (M+H);

● Substituting 2-ethynylpyrazine for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5- (6-(((3-methylisoxazol-5-yl)methyl)amino)-2-(4-(pyrazin-2-yl )-1H-1,2,3-triazol-1-yl)-9H- purin-9-yl)tetrahydrofuran-2-carboxamide (1.66); MS 535 (M+H); ● Substituting 2-ethynylpyridine for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5- (6-(((3-methylisoxazol-5-yl)methyl)amino)-2-(4-(pyridin-2-yl )-1H-1,2,3-triazol-1-yl)-9H- purin-9-yl)tetrahydrofuran-2-carboxamide; (1.67) MS 534 (M+H);

● Substituting prop-2-yn-1-ylcyclobutane for propyne gave (2S,3S,4R,5R)-5-(2-(4- (cyclobutylmethyl)-1H-1,2,3-triazol-1-yl)-6-(((3-methylisoxa zol-5-yl)methyl)amino)-9H- purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxam ide (1.68): MS 525 (M+H); ● Substituting 3-methoxyphenylacetylene for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-5- (2-(4-(3-methoxyphenyl)-1H-1,2,3-triazol-1-yl)-6-(((3-methyl isoxazol-5-yl)methyl)amino)- 9H-purin-9-yl)-N-methyltetrahydrofuran-2-carboxamide (1.69); MS 563 (M+H)

● Substituting 4,4-dimethylhex-1-yne for propyne gave (2S,3S,4R,5R)-5-(2-(4-(2,2- dimethylbutyl)-1H-1,2,3-triazol-1-yl)-6-(((3-methylisoxazol- 5-yl)methyl)amino)-9H-purin- 9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.70); MS 541 (M+H) ● Substituting 4,4-difluoropent-1-yne for propyne gave (2S,3S,4R,5R)-5-(2-(4-(2,2- difluoropropyl)-1H-1,2,3-triazol-1-yl)-6-(((3-methylisoxazol -5-yl)methyl)amino)-9H-purin- 9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.71); MS 535 (M+H);

● Substituting 4-methoxybut-1-yne for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-5-(2-(4-(2- methoxyethyl)-1H-1,2,3-triazol-1-yl)-6-(((3-methylisoxazol-5 -yl)methyl)amino)-9H-purin-9- yl)-N-methyltetrahydrofuran-2-carboxamide (1.72); MS 515 (M+H);

● Substituting prop-2-yn-1-ylcyclopropane for propyne gave (2S,3S,4R,5R)-5-(2-(4- (cyclopropylmethyl)-1H-1,2,3-triazol-1-yl)-6-(((3-methylisox azol-5-yl)methyl)amino)-9H- purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxam ide (1.73); MS 511 (M+H); ● Substituting prop-2-yn-1-ylbenzene for propyne gave (2S,3S,4R,5R)-5-(2-(4-benzyl-1H- 1,2,3-triazol-1-yl)-6-(((3-methylisoxazol-5-yl)methyl)amino) -9H-purin-9-yl)-3,4-dihydroxy- N-methyltetrahydrofuran-2-carboxamide (1.74); MS 547 (M+H);

● Substituting 3,4-difluorophenylacetylene for propyne gave (2S,3S,4R,5R)-5-(2-(4-(3,4- difluorophenyl)-1H-1,2,3-triazol-1-yl)-6-(((3-methylisoxazol -5-yl)methyl)amino)-9H-purin- 9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.75); MS 569 (M+H);

● Substituting 3-ethynylpyridazine for propyne gave (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl- 5-(6-(((3-methylisoxazol-5-yl)methyl)amino)-2-(4-(pyridazin- 3-yl)-1H-1,2,3-triazol-1-yl)- 9H-purin-9-yl)tetrahydrofuran-2-carboxamide (1.76); MS 535 (M+H).

[00374] The following compounds were prepared using the method of Example 4

substituting azide 1.24 for the azide 1.15 and substituting the appropriate alkyne for propyne in Step-1: ● Substituting 3-methoxyphenylacetylene for propyne gave (2S,3S,4R,5R)-5-(6-((3- chlorobenzyl)amino)-2-(4-(3-methoxyphenyl)-1H-1,2,3-triazol- 1-yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.77); MS 593 (M+H);

● Substituting 3-fluorophenylacetylene for propyne gave (2S,3S,4R,5R)-5-(6-((3- chlorobenzyl)amino)-2-(4-(3-fluorophenyl)-1H-1,2,3-triazol-1 -yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.78); MS 581 (M+H);

● Substituting 3,4-difluorophenylacetylene for propyne gave (2S,3S,4R,5R)-5-(6-((3- chlorobenzyl)amino)-2-(4-(3,4-difluorophenyl)-1H-1,2,3-triaz ol-1-yl)-9H-purin-9-yl)- 3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (1.79); MS 599 (M+H);

● Substituting 3-phenyl-1-propyne for propyne gave (2S,3S,4R,5R)-5-(2-(4-benzyl-1H- 1,2,3-triazol-1-yl)-6-((3-chlorobenzyl)amino)-9H-purin-9-yl) -3,4-dihydroxy-N- methyltetrahydrofuran-2-carboxamide (1.80); MS 577 (M+H).

Example 5: Preparation of (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(7-(propylamino)-5- (4-(pyridin-2-yl)-1H-1,2,3-triazol-1-yl)-3H-imidazo[4,5-b]py ridin-3-yl)tetrahydrofuran-2- carboxamide (1.81) Step-1

[00375] Two reactions were carried out in in sequence. In each a solution of compound A-1 (12.0 g, 78.1 mmol, 1.00 eq) in CHCl3 (750 mL) was added m-CPBA (25.2 g, 117.2 mmol, 80.0% purity, 1.50 eq) at 20°C. The resulting mixture was stirred at 60°C for 3 hrs. LC-MS analysis showed compound A-1 was consumed. Several new peaks were shown on LC-MS and ~57% of desired compound was detected. The two reactions were combined and the reaction mixture was filtered and was concentrated under reduced pressure to give compound B-1 (44.0 g, crude) as white solid; MS: 170.1 (M+H).

Step-2

[00376] To a solution o compound B-1 (44.0 g, crude) in CHCl ₃ (2000 mL) and DMF (2000 mL) was added POBr ₃ (32.5 g, 113.6 mmol, 11.5 mL, 0.60 eq) at 20 °C. The resulting mixture was stirred at 20°C for 12 hrs. TLC (dichloromethane/ methanol = 10:1) indicated ~0% of compound B-1 was remained, and one major new spot with lower polarity was detected. By LC- MS analysis. Several new peaks were shown on LC-MS and ~5% of desired compound was detected. The reaction mixture was diluted with H2O (6 L) and extracted with three 2-L portions of DCM. The combined organic extract was washed with brine (2 L x 2), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The crude product was triturated with DCM: MeOH = 10:1 at 20 ^o C for 1 hr to give mixture compound C-1 and D-1 (11 g, crude) as gray solid. LCMS of reaction mixture: Compound C-1, Rt=1.07, MS: 234 (M+H) ^; Compound D-1, Rt=1.09, MS: 278 (M+H). ^. Step-3 [00377] A mixture of compound C-1 and D-1 (2.00 g, crude) in MeCN (60 mL), bis- trimethylsilylacetamide (BSA) (1.87 g, 9.21 mmol, 2.28 mL, 1.07 eq) was slowly added, the mixture was stirred at 85°C for 1 hr. The mixture was cooled to 25°C and compound E-1 (3.15 g, 9.89 mmol, 1.15 eq), TMSOTf (2.49 g, 11.1 mmol, 2.02 mL, 1.30 eq) in MeCN (60 mL) was slowly added. The mixture was stirred at 85°C for 3 hrs. TLC (dichloromethane/methanol = 10:1) indicated ~0% of compound C-1 and D-1 remained, and one major new spot with lower polarity was detected. LC-MS analysis showed ~0% of compound C-1 and D-1 remaining. Several new peaks were shown on LC-MS and ~81% of desired compound was detected. The reaction mixture was poured into saturated aqueous NaHCO ₃ (350 mL), was adjusted to pH = 8, and was extracted with EtOAc (100 mL x 3). The combined organic layers were washed with brine (150 mL), dried over Na2SO4, filtered and concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ ,

dichloromethane/methanol = 100/1 to 50/1) to give mixture compound F-1 and G-1 (3.30 g, 6.73 mmol, 78.1% yield) as white solid. LCMS of reaction mixture: Compound F-1, Rt=1.269, MS: 492.1 (M+H); Compound G-1, Rt=1.269, MS: 536.1 (M+H).

1H NMR: 400 MHz DMSO-d ₆ Compound F-1, d (ppm) 8.81 (d, J = 2 Hz, 1H), 7.84 (s, 1H), 6.31 (t, J = 5 Hz, 1H), 5.94 (t, J = 5.6 Hz, 1H), 5.64 (t, J = 5.4 Hz, 1H), 4.43-4.39 (m, 2H), 4.30-4.27 (m, 1H), 2.12 (s, 3H), 2.05 (s, 3H), 2.02 (s, 3H). Compound G-1 , d (ppm) 8.81 (d, J = 2 Hz, 1H), 7.95 (s, 1H), 6.31 (t, J = 5 Hz, 1H), 5.94 (t, J = 5.6 Hz, 1H), 5.64 (t, J = 5.4 Hz, 1H), 4.43- 4.39 (m, 2H), 4.30-4.27 (m, 1H), 2.12 (s, 3H), 2.05 (s, 3H), 2.02 (s, 3H). Step-4

A mixture of compound F-1 and G-1 (3.30 g, 6.73 mmol, 1.00 eq) in NH3/MeOH (7.00 M, 33.0 mL, 34.3 eq) was stirred at 20°C for 3 hrs. TLC (dichloromethane/methanol = 10:1) indicated ~0% of compound F-1 and G-1 remained, and one major new spot with larger polarity was detected. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , dichloromethane/methanol = 50/1 to 0/1) to give mixture compound H-1 and I-1 (2.20 g, 6.03 mmol, 89.7% yield) as a white solid.

LCMS of reaction mixture: Compound H-1, Rt=1.037, MS: 366.0 (M+H); Compound I-1, Rt=1.037, MS: 410.0 (M+H).

Step-5

[00378] To a solution of compound H-1 and I-1 (3.60 g, 9.87 mmol, 1.00 eq) in acetone (140 mL) was added p-TsOH (1.70 g, 9.87 mmol, 1.00 eq) and (CH ₃ ) ₂ C(OMe) ₂ (6.17 g, 59.2 mmol, 7.26 mL, 6.00 eq) at 20 °C. The resulting mixture was stirred at 20°C for 1 hr. TLC (petroleum ether/ ethyl acetate = 1:1) indicated ~0% of compound H-1 and I-1 remained, and one major new spot with lower polarity was detected. The reaction mixture was basified with NH ₃ .H ₂ O (1.5 mL) and was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ ethyl acetate = 10/1 to 0/1) to give mixture compound J-1 and K-1 (3.2 g, crude) as yellow solid. This was used in the next step without further purification.

Step-6

[00379] To a solution of compound J-1 and K-1 (2.34 g, crude) in MeCN (12 mL) and H2O (12 mL) was added 2,2,6,6-tetramethylpiperidine-1-oxy (TEMPO) (181.8 mg, 1.16 mmol, 0.20 eq) and PhI(OAc) ₂ (4.10 g, 12.7 mmol, 2.20 eq) at 20°C . The mixture was stirred at 20°C for 2 hrs. TLC (petroleum ether/ethyl acetate = 1:1) indicated ~0% of compound J-1 and K-1 remained, and one major new spot with greater polarity was detected. The mixture was added to saturated NaHCO ₃ solution (100 mL) slowly, and the mixture was adjusted to pH> 8, and then was extracted with DCM (60 mL x 2). The aqueous phase was adjusted to pH= 4~5 by adding HCl (1M). The mixture was extracted with EtOAc (100 mL x 5). The combined ethyl acetate extract was washed with sat. NaCl (200 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give mixture compound L-1 and M-1 (2.25 g, crude) as yellow solid. LCMS of reaction mixture: Compound L-1, Rt=1.193, MS: 420.1 (M+H);

Compound M-1, Rt=1.215, MS: 464.0 (M+H). Step-7

[00380] To a solution of compound L-1 and M-1 (2.3 g, crude), MeNH ₂ .HCl (370.9 mg, 5.49 mmol, 1.00 eq) and DIPEA (3.20 g, 24.7 mmol, 4.31 mL, 4.50 eq) in THF (40 mL) was added tri n-propanephosphonic acid anhydride (T3P) (5.24 g, 8.24 mmol, 4.90 mL, 50.0% purity, 1.50 eq) at 0°C. The mixture was stirred at 25°C for 2 hrs. TLC (petroleum ether/ethyl acetate = 0:1) indicated ~0% of compound L-1 and M-1 remained, and one major new spot with lower polarity was detected. LC-MS showed ~0% of compound L-1 and M-1 remained. Several new peaks were shown on LC-MS and ~90% of desired compound was detected. The reaction mixture was diluted with H ₂ O (100 mL) and was extracted with EtOAc (50 mL x 3). The combined organic layers were washed with brine (80 mL), dried over Na2SO4, filtered and concentrated under reduced pressure to give mixture compound N-1 and O-1 (2.00 g, crude) as a green solid.

LCMS of reaction mixture: Compound N-1, Rt=1.187, MS: 431.1 (M+H); Compound O-1, Rt=1.187, MS: 477.0 (M+H) ⁺ Step-8

N-1 O-1 Q-1

[00381] A solution of compound N-1 and O-1 (0.90 g, crude) in N-methylpyrrolidone (NMP) (45 mL) was added TEA (6.54 g, 64.6 mmol, 9.00 mL, 31.0 eq) and amine P-1 (6.47 g, 109.4 mmol, 9.00 mL, 52.5 eq) at 20 °C. The mixture was stirred at 120°C for 12 hrs. TLC

(Dichloromethane/ Methanol = 10:1) indicated ~0% of compound N-1 and O-1 remained, and one major new spot with greater polarity was detected. LC-MS showed ~0% of compound N-1 and O-1 remained. Several new peaks were shown on LC-MS and ~12% of desired compound was detected. The reaction mixture was diluted with H2O (200 mL) and was extracted with EtOAc (100 mL x 3). The combined organic extract was washed with brine (150 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , dichloromethane/methanol = 1/0 to 0/1) to give compound Q-1 (600.0 mg, 1.32 mmol, 63.3% yield) as a white solid. LCMS of reaction mixture: Rt=1.464, MS: 454.2 (M+H); ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.21 (s, 1H), 7.51 (d, J = 4 Hz, 1H), 7.25 (t, J = 6 Hz, 1H), 6.49 (s, 1H), 6.26 (d, J = 4 Hz, 1H), 5.29 (s, 2H), 4.53 (s, 1H), 3.30-3.28 (m, 2H), 2.40 (d, J = 4 Hz, 3H), 1.61-1.54 (m, 5H), 1.33 (s, 3H), 0.90 (t, J = 6 Hz, 3H).

Step-9

[00382] To a solution of compound Q-1 (100.0 mg, 220.1 umol, 1.00 eq) in H2O (0.4 mL) and DMSO (2 mL) at 20°C was added sodium L-ascorbate (4.36 mg, 22.0 mmol, 0.10 eq), CuI (4.19 mg, 22.1 mmol, 0.10 eq), compound S-1 (4.70 mg, 33.0 mmol, 0.15 eq) and NaN3 (15.7 mg, 242.1 mmol, 1.10 eq) was added alkyne R-1 (27.2 mg, 264.1 mmol, 26.7 uL, 1.20 eq) in four equal portions. The resulting mixture was stirred at 60°C for 12 hrs. LC-MS showed ~10% of compound Q-1 remained. Several new peaks were shown on LC-MS and ~17% of desired compound was detected. Two identical reactions were combined for work up. The reaction mixture was diluted with H2O (15 mL) and was extracted with DCM (15 mL x 3). The combined organic extract washed with brine (20 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Waters Xbridge Prep OBD C18150 x 40 mm x 10 mm; mobile phase: [water (0.05% NH3H2O + 10 mM NH4HCO3) - ACN]; B%: 30% - 60%, 8 min) to give compound T-1 (100.0 mg, 192.4 umol, 43.7% yield) as a yellow solid. LCMS of reaction mixture: Rt = 1.074, MS: 520.3 (M+H).

Step-10

[00383] A mixture of compound T-1 (130.0 mg, 250.2 mmol, 1.00 eq) in TFA (15.4 g, 108.0 mmol, 10.0 mL, 80.0% purity, 431.8 eq) was stirred at 20 °C for 2 hrs. LC-MS (ET28500-415- P1A2) showed ~0% of compound T-1 remained. Several new peaks were shown on LC-MS and ~47% of desired compound was detected. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Phenomenex Luna C18100 x 30 mm x 5 mm; mobile phase: [water (0.04% HCl) - ACN]; B%: 15% - 35%, 10 min) to give compound 1.81 (60.0 mg, 125.1 mmol, 50.0% yield, 100% purity) as a white solid.

LCMS of reaction mixture: Rt=1.117, MS: 480.1 (M+H); ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 9.45 (s, 1H), 8.90 (s, 1H), 8.76 (d, J = 4.8 Hz, 1H), 8.35 (d, J = 8 Hz, 1H), 8.22 (t, J = 7.8 Hz, 1H), 8.11 (d, J = 4.4 Hz, 1H), 7.81 (s, 1H), 7.63 (t, J = 6.2 Hz, 1H), 7.22 (s, 1H), 6.15 (d, J = 6 Hz, 1H), 4.79-4.76 (m, 1H), 4.38 (d, J = 4 Hz, 2H), 4.31-4.29 (m, 2H), 3.49 (s, 2H), 2.58 (d, J = 4.8 Hz, 3H), 1.72-1.66 (m, 2H), 0.98 (t, J = 7.2 Hz, 3H). Example 6: General Scheme for Preparation of Compounds

Example 7: Preparation of (3aS,4S,6R,6aR)-6-(6-(cyclobutylamino)-2-iodo-9H-purin-9-yl) - N,2,2 trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.3)

A solution of 3 g (6.25 mmol, 1 eq) of Int.I (WO ₂ 003061670),cyclobutanamine (533.7 mg, 7.51 mmol, 643.12 mL, 1.20 eq) in t-BuOH (30 mL), was added TEA (3.16 g, 31.27 mmol, 4.35 mL, 5 eq) at 25°C.The mixture was stirred at 65°C for 1.5hr. TLC analysis showed the starting material was consumed completely. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by chromatography (SiO ₂ , petroleum ether/ethyl acetate=50/1 to 0/1) to give compound 2.3 (2.7 g, 5.25 mmol, 84% yield) as a yellow solid, which was used without further purification. ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.48 (d, J = 7.9 Hz, 1H), 8.16 (s, 1H), 7.52-7.42 (m, J = 4.8 Hz, 1H), 6.24 (d, J = 1.2 Hz, 1H), 5.37- 5.20 (m, 2H), 4.54 (d, J = 1.6 Hz, 2H), 2.38 (d, J = 4.4 Hz, 3H), 2.32-2.22 (m, 4H), 1.70-1.60 (m, 2H), 1.53 (s, 3H), 1.33 (s, 3H).

Similarly prepared by the method of EXAMPLE 1 were the additional compounds listed below: ● (3aS,4S,6R,6aR)-6-(6-(cyclopropylamino)-2-iodo-9H-purin-9-yl )-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.4) by using cyclopropyl amine as cyclobutanamine; MS: 501.0 (M+H), ¹ H NMR: 400 MHz CDCl3 d (ppm) 7.68 (s, 1H), 6.97 (s, 1H), 5.92 (d, J = 2.8 Hz, 2H), 5.25-5.20 (m, 2H), 4.70 (s, 1H), 2.90 (t, J = 6.4 Hz, 3H), 1.71 (s, 1H), 1.63 (s, 3H), 1.38 (s, 3H), 0.95-0.92 (m, 2H), 0.67-0.63 (m, 2H); ● (3aS,4S,6R,6aR)-6-(6-((2,2-difluoroethyl)amino)-2-iodo-9H-pu rin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.5) by using 2,2- difluoroethylamine as cyclobutanamine; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.46 (s, 1H), 8.25 (s, 1H), 7.49 (d, J = 4.8 Hz, 1H), 6.30-6.01 (m, 2H), 5.33-5.29 (m, 2H), 4.56 (s, 1H), 3.82 (s, 2H), 2.37 (d, J = 4.4 Hz, 3H), 1.53 (s, 3H), 1.34 (s, 3H);

● (3aS,4S,6R,6aR)-6-(6-(ethylamino)-2-iodo-9H-purin-9-yl)-N,2, 2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.6) using ethyl amine as cyclobutanamine; MS: 489 (M+H);

● (3aS,4S,6R,6aR)-6-(2-iodo-6-(propylamino)-9H-purin-9-yl)-N,2 ,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.7) using propyl amine as cyclobutanamine; MS 503 (M+H);

● (3aS,4S,6R,6aR)-6-(6-((2,2-difluoropropyl)amino)-2-iodo-9H-p urin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.8) using 2,2- difluoropropylamine as cyclobutanamine; MS: 539 (M+H); ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.48 (br s, 1H), 8.23 (s, 1H), 7.46 (d, J = 4.4 Hz, 1H), 6.28 (s, 1H), 5.36-5.25 (m, 2H), 4.55 (d, J=1.6 Hz, 1H), 3.97-3.79 (m, 2H), 2.36 (d, J = 4.4 Hz, 3H), 1.61 (t, J = 20 Hz, 3H), 1.53 (s, 3H), 1.34 (s, 3H);

● (3aS,4S,6R,6aR)-6-(6-(ethoxyamino)-2-iodo-9H-purin-9-yl)-N,2 ,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.9) using ethoxyamine as cyclobutanamine; MS 505 (M + H);

● (3aS,4S,6R,6aR)-6-(2-iodo-6-((1-methylazetidin-3-yl)amino)-9 H-purin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.10) using 1-methylazetidine-1- amine as cyclobutanamine; MS 530 (M +H);

● (3aS,4S,6R,6aR)-6-(2-iodo-6-(((3-methylisoxazol-5-yl)methyl) amino)-9H-purin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.11) using (3-methylisoxazol-5- yl)methanamine as 2; MS: 556 (M+H); ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.77 (s, 1H), 8.22 (s, 1H), 7.48 (t, J = 4.8 Hz, 1H), 6.27 (s, 1H), 6.15 (s, 1H), 5.34-5.29 (m, 2H), 4.69 (s, 2H), 4.56 (d, J = 1.6 Hz, 1H), 2.36 (d, J = 4.8 Hz, 3H), 2.18 (s, 3H) 1.53 (s, 3H), 1.34 (s, 3H). Table 4: Intermediates prepared by Example 7 by varying the amine reagent

Example 8: (3aS,4S,6R,6aR)-6-(6-((2,2-difluoroethyl)amino)-2-ethynyl-9H -purin-9-yl)- N,2,2-trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxami de (2.14)

Step-1

To a solution of compound 2.5 (730.0 mg, crude) and compound ethynyltrimethylsilane (273.5 mg, 2.78 mmol, 385.7 uL, 2.00 eq) in DMF (10 mL) was added Pd(PPh3) ₂ Cl2 (97.7 mg, 139.2 mmol, 0.1.0 eq), TEA (281.8 mg, 2.78 mmol, 387.6 mL, 2.00 eq) and CuI (26.5 mg, 139.2 mmol, 0.10 eq) at 20°C. The resulting mixture was stirred at 20°C for 12 hrs. TLC (petroleum ether/ethyl acetate = 0:1) indicated ~0% of compound 2.5 was remained, and one major new spot with lower polarity was detected. LC-MS analysis showed ~0% of compound 2.5 remained. Several new peaks were shown on LC-MS and ~34% of desired compound was detected. The reaction mixture was diluted with H ₂ O (30 mL) and extracted with EtOAc (20 mL x 3). The combined organic layers were washed with brine (30 mL), dried over Na ₂ SO ₄ , filtered and concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , Petroleum ether/ethyl acetate = 1/0 to 0/1) to give compound Int.2-A (650.0 mg, 1.31 mmol, 94.3% yield) as brown solid. LCMS: Rt=1.348, MS: 495.3 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.40 (s, 1H), 8.30 (s, 1H), 7.74 (d, J = 4.4 Hz, 1H), 6.31- 6.03 (m, 2H), 5.32-5.26 (m, 2H), 4.58 (s, 1H), 3.88 (s, 2H), 2.45 (d, J = 4.8 Hz, 3H), 1.55 (s, 3H), 1.34 (s, 3H), 2.86 (s, 9H).

Step-2

A mixture of compound Int.2-A (650.0 mg, 1.31 mmol, 1.00 eq) and K2CO3 (908.2 mg, 6.57 mmol, 5.00 eq) in MeOH (10 mL) was stirred at 20°C for 1 hr. TLC (petroleum ether/ethyl acetate = 0:1) indicated ~0% of compound Int.2-A remained, and one major new spot with higher polarity was detected. LC-MS analysis showed ~0% of compound Int.2-A remained. Several new peaks were shown on LC-MS and ~61% of desired compound was detected. The reaction mixture was filtered and concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ethyl acetate = 10/1 to 0/1) to give compound 2.14 as a brown solid. LCMS: Rt=1.032, MS: 423.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.37 (s, 2H), 8.15 (d, J = 4.8 Hz, 1H), 6.39-6.18 (m, 2H), 6.05 (d, J = 6.4 Hz, 1H), 5.99 (d, J = 2.8 Hz, 1H), 5.63 (s, 1H), 5.42-5.39 (m, 1H), 4.00 (s, 2H), 2.62 (d, J = 4.4 Hz, 3H), 1.48 (s, 6H).

Similarly prepared by the method of Example 8 were the additional compounds listed below: ● (3aS,4S,6R,6aR)-6-(6-(cyclobutylamino)-2-ethynyl-9H-purin-9- yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.12) using intermediate 2.3, MS: 413 (M+H) ⁺ ;

● (3aS,4S,6R,6aR)-6-(6-(cyclopropylamino)-2-ethynyl-9H-purin-9 -yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.13) using intermediate 2.4, MS: 399 (M+H) ⁺ ;

● (3aS,4S,6R,6aR)-6-(6-(ethylamino)-2-ethynyl-9H-purin-9-yl)-N ,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.15) using intermediate 2.6, MS: 387 (M+H) ⁺ ;

● (3aS,4S,6R,6aR)-6-(2-ethynyl-6-(propylamino)-9H-purin-9-yl)- N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.16) using intermediate 2.7, MS: 401 (M+H) ⁺ ;

● (3aS,4S,6R,6aR)-6-(6-((2,2-difluoropropyl)amino)-2-ethynyl-9 H-purin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.17) using intermediate 2.8, MS: 437 (M+H) ⁺ ;

● (3aS,4S,6R,6aR)-6-(6-(ethoxyamino)-2-ethynyl-9H-purin-9-yl)- N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.18) using intermediate 2.9, MS: 403 (M+H) ⁺ ;

● (3aS,4S,6R,6aR)-6-(2-ethynyl-6-((1-methylazetidin-3-yl)amino )-9H-purin-9-yl)-N,2,2- trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxamide (2.19) using intermediate 2.10, MS: 428 (M+H) ⁺ ; ● (3aS,4S,6R,6aR)-6-(2-ethynyl-6-(((3-methylisoxazol-5-yl)meth yl)amino)-9H-purin-9-yl)- N,2,2-trimethyltetrahydrofuro[3,4-d][1,3]dioxole-4-carboxami de (2.20) using intermediate 2.11, MS: 454 (M+H) ⁺ . Table 5. Compounds prepared by the method of Example 8 starting with varying TMS protected alkynes

Example 9: Preparation of (2S,3S,4R,5R)-5-(6-((2,2-difluoroethyl)amino)-2-(1H-1,2,3- triazol-4-yl)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydr ofuran-2-carboxamide (2.21)

2.14 Int.2-B To a solution of compound 2.14 (85.0 mg, 201.2 mmol, 1.00 eq) and TMSN3 (34.7 mg, 301.8 umol, 39.7 uL, 1.50 eq) in DMF (1.8 mL) and MeOH (0.2 mL) was added CuI (1.92 mg, 10.0 umol, 0.05 eq) at 20°C. The resulting mixture was stirred at 90°C for 12 hrs. LC-MS analysis showed ~0% of compound 2.14 was remained. Several new peaks were shown on LC-MS and ~15% of desired compound was detected. The reaction mixture was diluted with H2O (10 mL) and extracted with EtOAc (10 mL x 3). The combined organic extract was washed with brine (15 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Phenomenex luna C18250 x 50 mm x 10 mm;mobile phase: [water (0.1% TFA) - ACN]; B%: 20% - 40%, 10 min) to give compound Int.2-B as a white solid. LCMS: Rt=1.094, MS: 466.3 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.28-8.36 (m, 3H), 7.47 (d, J = 4.4 Hz, 1H), 6.45-6.26 (m, 2H), 5.60-5.58 (m, 1H), 5.36 (d, J = 6 Hz, 1H), 4.62 (s, 1H), 4.04-3.96 (m, 1H), 2.13 (d, J = 4.4 Hz, 3H), 1.55 (s, 3H), 1.35 (d, J = 4.0 Hz, 5H). Step-2

Int.2-B 2.21 A mixture of compound Int.2-B (140.0 mg, 300.8 umol, 1.00 eq) in TFA (7.70 g, 54.0 mmol, 5 mL, 80.0% purity, 179.6 eq) was stirred at 20°C for 1 hr. LC-MS analysis showed ~0% of compound Int.2-B remained. Several new peaks were shown on LC-MS and ~67% of desired compound was detected. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Waters Xbridge Prep OBD C18150 x 40 mm x 10 mm; mobile phase: [water (0.05% NH3H2O + 10 mM NH4HCO3) - ACN]; B%: 5% - 25%, 8 min) to give 2.21 as white solid. LCMS: Rt = 0.978, MS: 426.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 15.2 (s, 1H), 8.56 (s, 1H), 8.33 (s, 2H), 8.05 (d, J = 2.8 Hz, 1H), 6.43- 6.28 (m, 1H), 6.07 (d, J = 6.8 Hz, 1H), 5.7 (d, J = 4 Hz, 1H), 5.59 (d, J = 6.4 Hz, 1H), 4.83-4.79 (m, 1H), 4.34 (d, J = 2 Hz, 1H), 4.29 (s, 1H), 4.02 (s, 2H), 2.61 (d, J = 4 Hz, 3H),

Similarly prepared according to the method of Example 9 were: ● (2S,3S,4R,5R)-5-(6-((2,2-difluoroethyl)amino)-2-(1-methyl-1H -1,2,3-triazol-4-yl)-9H-purin- 9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.22) through reaction of 2.14 and methylazide in step 1; MS: 440 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(6-(cyclobutylamino)-2-(1H-1,2,3-triazol-4-y l)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.23) through reaction of 2.12 and trimethylsilylazide in step 1; MS: 416 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(6-(cyclobutylamino)-2-(1-(cyclopropylmethyl )-1H-1,2,3-triazol-4-yl)-9H- purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxam ide (2.24) through reaction of 2.12 and cyclopropylmethylazide in step 1; MS: 470 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(2-(1-allyl-1H-1,2,3-triazol-4-yl)-6-(cyclob utylamino)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.25) through reaction of 2.12 and allylazide in step 1; MS: 456 (M+H) ⁺ ; ● (2S,3S,4R,5R)-5-(6-(cyclopropylamino)-2-(1H-1,2,3-triazol-4- yl)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.26) through reaction of 2.13 and trimethylsilylazide in step 1; MS: 402 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(6-(cyclopropylamino)-2-(1-(cyclopropylmethy l)-1H-1,2,3-triazol-4-yl)- 9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carbo xamide (2.27) through reaction of 2.13 and cyclopropylmethylazide in step 1; MS: 456 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(2-(1-(cyclopropylmethyl)-1H-1,2,3-triazol-4 -yl)-6-(ethylamino)-9H-purin- 9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.28) through reaction of 2.15 and cyclopropylmethylazide in step 1; MS: 444 (M+H) ⁺ ;

● (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(6-(propylamino)-2-(1 H-1,2,3-triazol-4-yl)-9H- purin-9-yl)tetrahydrofuran-2-carboxamide (2.29) through reaction of 2.16 and

trimethylsilylazide in step 1; MS: 404 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(2-(1-benzyl-1H-1,2,3-triazol-4-yl)-6-(propy lamino)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.30) through reaction of 2.16 and benzylazide in step 1; MS: 494 (M+H) ⁺ ;

● (2S,3S,4R,5R)-3,4-dihydroxy-5-(2-(1-(2-methoxyethyl)-1H-1,2, 3-triazol-4-yl)-6- (propylamino)-9H-purin-9-yl)-N-methyltetrahydrofuran-2-carbo xamide (2.31) through reaction of 2.16 and 2-methoxyethylazide in step 1; MS: 478 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(2-(1-butyl-1H-1,2,3-triazol-4-yl)-6-(propyl amino)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.32) through reaction of 2.16 and 2- butylazide in step 1; MS: 460 (M+H) ⁺ ;

● (2S,3S,4R,5R)-3,4-dihydroxy-5-(2-(1-(3-methoxyphenyl)-1H-1,2 ,3-triazol-4-yl)-6- (propylamino)-9H-purin-9-yl)-N-methyltetrahydrofuran-2-carbo xamide (2.33) through reaction of 2.16 and 3-methoxyphenylazide in step 1; MS: 510 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(2-(1-(cyclopropylmethyl)-1H-1,2,3-triazol-4 -yl)-6-(propylamino)-9H- purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxam ide (2.34) through reaction of 2.16 and cyclopropylmethylazide in step 1; MS: 458 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(6-((2,2-difluoropropyl)amino)-2-(1-(3-metho xyphenyl)-1H-1,2,3-triazol- 4-yl)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2 -carboxamide (2.35) through reaction of 2.17 and 3-methoxyphenylazide in step 1; MS: 546 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(6-((2,2-difluoropropyl)amino)-2-(1H-1,2,3-t riazol-4-yl)-9H-purin-9-yl)- 3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.36) through reaction of 2.17 and trimethylsilylazide in step 1; MS: 440 (M+H) ⁺ ; ● (2S,3S,4R,5R)-5-(2-(1-butyl-1H-1,2,3-triazol-4-yl)-6-((2,2-d ifluoropropyl)amino)-9H-purin- 9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.37) through reaction of 2.17 and butylazide in step 1; MS: 496 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(6-((2,2-difluoropropyl)amino)-2-(1-(2-metho xyethyl)-1H-1,2,3-triazol-4- yl)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-c arboxamide (2.38) through reaction of 2.17 and 2-methoxyethylazide in step 1; MS: 498 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(6-(ethoxyamino)-2-(1H-1,2,3-triazol-4-yl)-9 H-purin-9-yl)-3,4-dihydroxy- N-methyltetrahydrofuran-2-carboxamide (2.39) through reaction of 2.18 and

trimethylsilylazide in step 1; MS: 406 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(6-(ethoxyamino)-2-(1-(2-methoxyethyl)-1H-1, 2,3-triazol-4-yl)-9H-purin- 9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.40) through reaction of 2.18 and 2-methoxyethylazide in step 1; MS: 464 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(2-(1-butyl-1H-1,2,3-triazol-4-yl)-6-(ethoxy amino)-9H-purin-9-yl)-3,4- dihydroxy-N-methyltetrahydrofuran-2-carboxamide (2.41) through reaction of 2.18 and butylazide in step 1; MS: 462 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(2-(1-(3-fluorophenyl)-1H-1,2,3-triazol-4-yl )-6-((1-methylazetidin-3- yl)amino)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofur an-2-carboxamide (2.42) through reaction of 2.19 and 3-fluorophenylazide in step 1; MS: 525 (M+H) ⁺ ;

● (2S,3S,4R,5R)-3,4-dihydroxy-5-(2-(1-(3-methoxyphenyl)-1H-1,2 ,3-triazol-4-yl)-6-((1- methylazetidin-3-yl)amino)-9H-purin-9-yl)-N-methyltetrahydro furan-2-carboxamide (2.43) through reaction of 2.19 and 3-methoxyphenylazide in step 1; MS: 537 (M+H) ⁺ ;

● (2S,3S,4R,5R)-3,4-dihydroxy-5-(2-(1-(3-methoxyphenyl)-1H-1,2 ,3-triazol-4-yl)-6-(((3- methylisoxazol-5-yl)methyl)amino)-9H-purin-9-yl)-N-methyltet rahydrofuran-2-carboxamide (2.44) through reaction of 2.20 and 3-methoxyphenylazide in step 1; MS: 563 (M+H) ⁺ ; ● (2S,3S,4R,5R)-5-(2-(1-benzyl-1H-1,2,3-triazol-4-yl)-6-(((3-m ethylisoxazol-5- yl)methyl)amino)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltetrah ydrofuran-2-carboxamide (2.45) through reaction of 2.20 and benzylazide in step 1; MS: 547 (M+H) ⁺ ;

● (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(6-(((3-methylisoxazo l-5-yl)methyl)amino)-2- (1H-1,2,3-triazol-4-yl)-9H-purin-9-yl)tetrahydrofuran-2-carb oxamide (2.46) through reaction of 2.20 and trimethylsilylazide in step 1; MS: 457 (M+H) ⁺ ;

● (2S,3S,4R,5R)-5-(2-(1-cyclopropyl-1H-1,2,3-triazol-4-yl)-6-( (2,2-difluoroethyl)amino)-9H- purin-9-yl)-3,4-dihydroxy-N-methyltetrahydrofuran-2-carboxam ide (2.47) through the reaction of 2.14 and cyclopropylazide in step 1. MS: 466 (M+H) ⁺ ;

Example 10: Preparation of (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(7- (propylamino)-5-(1H-1,2,3-triazol-4-yl)-3H-imidazo[4,5-b]pyr idin-3- yl)tetrahydrofuran-2-carboxamide (2.48)

2.48

Step-1

Two reactions were carried out in in sequence. In each a solution of compound A-2 (12.0 g, 78.1 mmol, 1.00 eq) in CHCl ₃ (750 mL) was added m-CPBA (25.2 g, 117.2 mmol, 80.0% purity, 1.50 eq) at 20°C. The resulting mixture was stirred at 60°C for 3 hrs. LC-MS analysis showed compound A-2 was consumed. Several new peaks were shown on LC-MS and ~57% of desired compound was detected. The two reactions were combined and the reaction mixture was filtered and was concentrated under reduced pressure to give compound B-2 (44.0 g, crude) as white solid; MS: 170.1 (M+H). Step-2

To a solution o compound B-2 (44.0 g, crude) in CHCl ₃ (2000 mL) and DMF (2000 mL) was added POBr3 (32.5 g, 113.6 mmol, 11.5 mL, 0.60 eq) at 20 °C. The resulting mixture was stirred at 20°C for 12 hrs. TLC (dichloromethane/ methanol = 10:1) indicated ~0% of compound B-2 was remained, and one major new spot with lower polarity was detected. By LC-MS analysis. Several new peaks were shown on LC-MS and ~5% of desired compound was detected. The reaction mixture was diluted with H ₂ O (6 L) and extracted with three 2-L portions of DCM. The combined organic extract was washed with brine (2 L x 2), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The crude product was triturated with DCM: MeOH = 10:1 at 20 ^o C for 1 hr to give mixture compound C-2 and D-2 (11 g, crude) as gray solid. LCMS of reaction mixture: Compound C-2, Rt=1.07, MS: 234 (M+H) ^; Compound D-2, Rt=1.09, MS: 278 (M+H). ^. Step-3

A mixture of compound C-2 and D-2 (2.00 g, crude) in MeCN (60 mL), BSA (1.87 g, 9.21 mmol, 2.28 mL, 1.07 eq) was slowly added, the mixture was stirred at 85°C for 1 hr. The mixture was cooled to 25°C and compound E-2 (3.15 g, 9.89 mmol, 1.15 eq), TMSOTf (2.49 g, 11.1 mmol, 2.02 mL, 1.30 eq) in MeCN (60 mL) was slowly added. The mixture was stirred at 85°C for 3 hrs. TLC (dichloromethane/methanol = 10:1) indicated ~0% of compound C-2 and D-2 remained, and one major new spot with lower polarity was detected. LC-MS analysis showed ~0% of compound C-2 and D-2 remaining. Several new peaks were shown on LC-MS and ~81% of desired compound was detected. The reaction mixture was poured into saturated aqueous NaHCO3 (350 mL), was adjusted to pH = 8, and was extracted with EtOAc (100 mL x 3). The combined organic layers were washed with brine (150 mL), dried over Na ₂ SO ₄ , filtered and concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , dichloromethane/methanol = 100/1 to 50/1) to give mixture compound F-2 and G-2 (3.30 g, 6.73 mmol, 78.1% yield) as white solid. LCMS of reaction mixture: Compound F-2, Rt=1.269, MS: 492.1 (M+H); Compound G-2, Rt=1.269, MS: 536.1 (M+H). ¹ H NMR: 400 MHz DMSO-d6 Compound F-2, d (ppm) 8.81 (d, J = 2 Hz, 1H), 7.84 (s, 1H), 6.31 (t, J = 5 Hz, 1H), 5.94 (t, J = 5.6 Hz, 1H), 5.64 (t, J = 5.4 Hz, 1H), 4.43-4.39 (m, 2H), 4.30-4.27 (m, 1H), 2.12 (s, 3H), 2.05 (s, 3H), 2.02 (s, 3H). Compound G-2, d (ppm) 8.81 (d, J = 2 Hz, 1H), 7.95 (s, 1H), 6.31 (t, J = 5 Hz, 1H), 5.94 (t, J = 5.6 Hz, 1H), 5.64 (t, J = 5.4 Hz, 1H), 4.43- 4.39 (m, 2H), 4.30-4.27 (m, 1H), 2.12 (s, 3H), 2.05 (s, 3H), 2.02 (s, 3H).Table 5 Step-4

A mixture of compound F-2 and G-2 (3.30 g, 6.73 mmol, 1.00 eq) in NH3/MeOH (7.00 M, 33.0 mL, 34.3 eq) was stirred at 20°C for 3 hrs. TLC (dichloromethane/methanol = 10:1) indicated ~0% of compound F-2 and G-2 remained, and one major new spot with larger polarity was detected. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , dichloromethane/methanol = 50/1 to 0/1) to give mixture compound H-2 and I-2 (2.20 g, 6.03 mmol, 89.7% yield) as white solid. LCMS of reaction mixture: Compound H-2, Rt=1.037, MS: 366.0 (M+H); Compound I-2, Rt=1.037, MS: 410.0 (M+H).

Step-5

To a solution of compound H-2 and I-2 (3.60 g, 9.87 mmol, 1.00 eq) in acetone (140 mL) was added p-TsOH (1.70 g, 9.87 mmol, 1.00 eq) and (CH3) ₂ C(OMe) ₂ (6.17 g, 59.2 mmol, 7.26 mL, 6.00 eq) at 20 °C. The resulting mixture was stirred at 20°C for 1 hr. TLC (petroleum ether/ ethyl acetate = 1:1) indicated ~0% of compound H-2 and I-2 remained, and one major new spot with lower polarity was detected. The reaction mixture was basified with NH ₃ .H ₂ O (1.5 mL) and was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ ethyl acetate = 10/1 to 0/1) to give mixture compound J-2 and K-2 (3.2 g, crude) as yellow solid. This was used in the next step without further purification. Step-6

J-2 K-2 L-2 M-2 To a solution of compound J-2 and K-2 (2.34 g, crude) in MeCN (12 mL) and H2O (12 mL) was added TEMPO (181.8 mg, 1.16 mmol, 0.20 eq) and PhI(OAc) ₂ (4.10 g, 12.7 mmol, 2.20 eq) at 20°C . The mixture was stirred at 20°C for 2 hrs. TLC (petroleum ether/ethyl acetate = 1:1) indicated ~0% of compound J-2 and K-2 remained, and one major new spot with greater polarity was detected. The mixture was added to saturated NaHCO3 solution (100 mL) slowly, and the mixture was adjusted to pH> 8, and then was extracted with DCM (60 mL x 2). The aqueous phase was adjusted to pH= 4~5 by adding HCl (1M). The mixture was extracted with EtOAc (100 mL x 5). The combined ethyl acetate extract was washed with sat. NaCl (200 mL), was dried over Na2SO4, was filtered and was concentrated under reduced pressure to give mixture compound L-2 and M-2 (2.25 g, crude) as yellow solid. LCMS of reaction mixture: Compound L-2, Rt=1.193, MS: 420.1 (M+H); Compound M-2, Rt=1.215, MS: 464.0 (M+H). Step-7

To a solution of compound L-2 and M-2 (2.3 g, crude), MeNH ₂ .HCl (370.9 mg, 5.49 mmol, 1.00 eq) and DIPEA (3.20 g, 24.7 mmol, 4.31 mL, 4.50 eq) in THF (40 mL) was added T3P (5.24 g, 8.24 mmol, 4.90 mL, 50.0% purity, 1.50 eq) at 0°C. The mixture was stirred at 25°C for 2 hrs. TLC (petroleum ether/ethyl acetate = 0:1) indicated ~0% of compound L-2 and M-2 remained, and one major new spot with lower polarity was detected. LC-MS showed ~0% of compound L-2 and M-2 remained. Several new peaks were shown on LC-MS and ~90% of desired compound was detected. The reaction mixture was diluted with H ₂ O (100 mL) and was extracted with EtOAc (50 mL x 3). The combined organic layers were washed with brine (80 mL), dried over Na2SO4, filtered and concentrated under reduced pressure to give mixture compound N-2 and O-2 (2.00 g, crude) as a green solid. LCMS of reaction mixture: Compound N-2, Rt=1.187, MS: 431.1 (M+H); Compound O-2, Rt=1.187, MS: 477.0 (M+H) ⁺ Step-8

A solution of compound N-2 and O-2 (0.90 g, crude) in NMP (45 mL) was added TEA (6.54 g, 64.6 mmol, 9.00 mL, 31.0 eq) and amine P-2 (6.47 g, 109.4 mmol, 9.00 mL, 52.5 eq) at 20 °C. The mixture reactions was stirred at 120°C for 12 hrs. TLC (Dichloromethane/ Methanol = 10:1) indicated ~0% of compound N-2 and O-2 remained, and one major new spot with greater polarity was detected. LC-MS showed ~0% of compound N-2 and O-2 remained. Several new peaks were shown on LC-MS and ~12% of desired compound was detected. The reaction mixture was diluted with H ₂ O (200 mL) and was extracted with EtOAc (100 mL x 3). The combined organic extract was washed with brine (150 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , dichloromethane/methanol = 1/0 to 0/1) to give compound Q-2 (600.0 mg, 1.32 mmol, 63.3% yield) as a white solid. LCMS of reaction mixture: Rt=1.464, MS: 454.2 (M+H); ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.21 (s, 1H), 7.51 (d, J = 4 Hz, 1H), 7.25 (t, J = 6 Hz, 1H), 6.49 (s, 1H), 6.26 (d, J = 4 Hz, 1H), 5.29 (s, 2H), 4.53 (s, 1H), 3.30-3.28 (m, 2H), 2.40 (d, J = 4 Hz, 3H), 1.61-1.54 (m, 5H), 1.33 (s, 3H), 0.90 (t, J = 6 Hz, 3H).

Step-9

To a solution of compound Q-2 (350.0 mg, 770.3 mmol, 1.00 eq) and compound R-2 (151.3 mg, 1.54 mmol, 213.4 mL, 2.00 eq) in DMF (35 mL) was added Pd(PPh ₃ ) ₂ Cl ₂ (54.1 mg, 77.0 mmol, 0.10 eq), TEA (155.9 mg, 1.54 mmol, 214.4 uL, 2.00 eq) and CuI (14.6 mg, 77.0 mmol, 0.10 eq) at 20°C. The resulting mixture was stirred at 80°C for 12 hrs. TLC (petroleum ether/ethyl acetate = 0:1) indicated ~0% of compound Q-2 remained, and one major new spot with lower polarity was detected. LC-MS showed ~0% of compound Q-2 remained. Several new peaks were shown on LC-MS and ~7% of desired compound was detected. The reaction mixture was diluted with H2O (120 mL) and extracted with DCM (30 mL x 3). The combined organic extract was washed with brine (40 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ethyl acetate = 1/0 to 10/1) to give compound S-2 (410.0 mg, crude) as a brown solid. LCMS Rt = 1.390, MS: 472.3 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.30 (s, 1H), 7.96 (d, J = 4.4 Hz, 1H), 7.07 (t, J = 5.6 Hz, 1H), 6.55 (s, 1H), 6.23 (d, J = 2.8 Hz, 1H), 5.28-5.26 (m, 1H), 5.19 (d, J = 4.8 Hz, 1H), 4.53 (s, 1H), 3.32 (s, 2H), 2.55 (d, J = 4.4 Hz, 3H), 1.62-1.56 (m, 5H), 1.33 (s, 3H), 0.91 (t, J = 7.4 Hz, 3H), 0.25 (s, 9H).

Step-10

S-2 T-2 To a solution of compound S-2 (410.0 mg, 869.3 mmol, 1.00 eq) in MeOH (10 mL) was added K2CO3 (600.7 mg, 4.35 mmol, 5.00 eq) at 20°C. The resulting mixture was stirred at 20°C for 1 hr. TLC (Petroleum ether/ Ethyl acetate = 0:1) indicated ~0% of compound S-2 remained, and one major new spot with larger polarity was detected. LC-MS showed ~0% of compound S-2 remained. Several new peaks were shown on LC-MS and ~31% of desired compound was detected. The reaction mixture was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by prep-TLC (petroleum ether/ethyl acetate = 0:1) to give compound T-2 (300.0 mg, 751.0 mmol, 86.3% yield) as brown solid. LCMS: Rt=1.161, MS: 400.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.30 (s, 1H), 7.83 (d, J = 4 Hz, 1H), 7.09 (t, J = 6 Hz, 1H), 6.56 (s, 1H), 6.25 (d, J = 2.8 Hz, 1H), 5.30-5.28 (m, 1H), 5.24-5.22 (m, 1H), 4.53 (d, J = 2.4 Hz, 1H), 4.12 (s, 1H), 3.37-3.35 (m, 2H), 2.47 (d, J = 4 Hz, 3H), 1.61-1.54 (m, 5H), 1.33 (s, 3H), 0.91 (t, J = 7.4 Hz, 3H). Step-11

To a solution of compound T-2 (300.0 mg, 751.0 mmol, 1.00 eq) and TMSN ₃ (129.7 mg, 1.13 mmol, 148.1 uL, 1.50 eq) in DMF (9 mL) and MeOH (1 mL) was added CuI (7.15 mg, 37.5 mmol, 0.050 eq) at 20°C. The resulting mixture was stirred at 90°C for 12 hrs. LC-MS analysis showed ~12% of compound T-2 remained. Several new peaks were shown on LC-MS and ~5% of desired compound was detected. The reaction mixture was diluted with H2O (50 mL) and was extracted with EtOAc (20 mL x 3). The combined organic extract was washed with brine (30 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by prep-TLC (petroleum ether/ethyl acetate = 0:1) to give compound U-2 (90 mg, crude) as a yellow solid. LCMS: Rt=1.228, MS: 443.3 (M+H) ⁺ .

Step-12

A mixture of compound U-2 (90.0 mg, 203.4 mmol, 1.00 eq) in TFA (13.8 g, 97.2 mmol, 9.00 mL, 80.0% purity, 478.1 eq) was stirred at 20 °C for 1 hr. LC-MS analysis showed ~0% of compound U-2 remained. Several new peaks were shown on LC-MS and ~53% of desired compound was detected. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Phenomenex Gemini-NX C18 75 x 30 mm x 3 mm; mobile phase: [water (0.05% NH3H2O + 10mM NH4HCO3)– CAN]; B%: 1% - 25%, 8 min) to give 2.48 (5.00 mg, 11.9 mmol, 5.88% yield, 96.2% purity) as a white solid. LCMS: Rt=1.596, MS: 403.1 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 14.95 (s, 1H), 8.24 (s, 1H), 8.09 (s, 1H), 7.86 (d, J = 4.8 Hz, 1H), 6.88 (s, 2H), 5.91 (d, J = 7.2 Hz, 1H), 5.50 (d, J = 4 Hz, 1H), 5.35 (d, J = 6.4 Hz, 1H), 4.78 (d, J = 4.8 Hz, 1H), 4.17 (d, J = 4 Hz, 2H), 3.27 (d, J = 4.8 Hz, 2H), 3.15 (s, 3H), 1.53-1.48 (m, 2H), 0.80 (t, J = 7.4 Hz, 3H).

Example 11: Preparation of (2S,3S,4R,5R)-5-(6-((2,2-difluoroethyl)amino)-2-(5-methyl-1H - 1,2,3-triazol-4-yl)-9H-purin-9-yl)-3,4-dihydroxy-N-methyltet rahydrofuran-2-carboxamide (2.49)

To a solution of compound 2.5 (500.0 mg, 953.7 mmol, 1.00 eq) and compound trimethyl(prop- 1-yn-1-yl)silane (642.3 mg, 5.72 mmol, 847.4 mL, 6.00 eq) in DMF (10 mL) was added KF (332.4 mg, 5.72 mmol, 6.00 eq), TEA (965.1 mg, 9.54 mmol, 1.33 mL, 10.0 eq), CuI (36.3 mg, 190.7 umol, 0.20 eq) and Pd(PPh ₃ ) ₂ Cl ₂ (133.9 mg, 190.7 mmol, 0.20 eq) under N ₂ . The mixture was stirred at 25 ^o C for 16 hrs. LCMS analysis showed the reaction was completed. The reaction mixture was partitioned between ethyl acetate (10 mL x 2) and H2O (30 mL). The organic phase was separated, was washed with brine (30 mL), was dried over Na2SO4, was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by silica gel chromatography (SiO ₂ , DCM: MeOH = 100:1) to obtain compound AA (350.0 mg, 721.8 mmol, 75.8% yield, 90.0% purity) as a brown oil. LCMS: 437.1 (M+H) ⁺ . ¹ H NMR: 400 MHz DMSO- d6 d (ppm) 8.38 (s, 1H), 8.27 (s, 1H), 7.79 (d, J = 4.8 Hz, 1H), 6.32-6.17 (m, 2H), 5.32-5.26 (m, 2H), 4.57 (s, 1H), 3.86 (brs, 2H), 2.44 (d, J = 4.8 Hz, 3H), 2.06 (s, 3H), 1.56 (s, 3H), 1.35 (s, 3H). Step-2

To a solution of compound AA (400.0 mg, 916.6 mmol, 1.00 eq) in DMF (40 mL) was added NaN ₃ (89.4 mg, 1.37 mmol, 1.50 eq). The mixture was stirred at 95°C for 72 hrs. LCMS showed 20% BB. The reaction mixture was partitioned between ethyl acetate (10 mL x 10) and H2O (20 mL). The organic phase was separated, washed with brine (20 mL x 2), was dried over Na2SO4, was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by preparative TLC (DCM: MeOH = 15:1) to obtain compound BB (90.0 mg, 187.7 umol, 20.4% yield) as yellow solid. MS: 480.2 (M+H) ⁺ . ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.36 (s, 2H), 7.66 (s, 1H), 6.41-6.08 (m, 2H), 5.46 (s, 2H), 4.63 (s, 1H), 3.98 (s, 2H), 2.60 (s, 3H), 2.22 (s, 3H), 1.56 (s, 3H), 1.35 (s, 3H).

Step-3

Compound BB (150.0 mg, 312.9 mmol, 1.00 eq) was dissolved in TFA (4.0 mL, 80.0% purity). The mixture was stirred at 25°C for 2 hrs. LCMS analysis showed the reaction was complete. The mixture was concentrated under reduced pressure and was purified by pre-HPLC (column: Phenomenex Gemini-NX C1875 * 30 mm * 3 mm; mobile phase: [water (0.05% NH3H2O + 10 mM NH ₄ HCO ₃ ) - ACN]; B%: 1% - 30%, 8 min) to obtain 2.49 as a white solid. MS: 440.2 (M+H) ⁺ . ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.54 (s, 1H), 8.34 (s, 1H), 8.09 (s, 1H), 6.39- 6.04 (m, 2H), 5.70 (d, J = 4.4 Hz, 1H), 5.58 (d, J = 6.0 Hz, 1H), 4.85 (s, 1H), 4.33 (s, 1H), 4.24 (s, 1H), 4.01-3.96 (m, 2H), 2.60 (s, 3H), 2.56 (d, J = 3.6 Hz, 3H).

Example 12: Preparation of (2R,3R,4S,5R)-2-(6-((2,2-difluoroethyl)amino)-2-(1H-1,2,3- triazol-4-yl)-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofura n-3,4-diol (2.50)

2.50 Step-1

Int.1 Int.2

Isoamyl nitrite (28.2 g, 240.7 mmol, 32.4 mL, 3.3 eq) was added to a mixture of Int.1 (22.0 g, 72.9 mmol, 1.0 eq), CuI (15.3 g, 80.2 mmol, 1.1 eq), CH2I2 (195.3 g, 729.2 mmol, 58.8 mL, 10.0 eq), and I ₂ (18.5 g, 72.9 mmol, 14.6 mL, 1.0 eq) in THF (220 mL) at 20°C. The reaction mixture was stirred at 70°C for 1 hr. TLC (dichloromethane: methanol = 10:1) indicated ~0% of compound Int.1 was remained, and one major new spot with lower polarity was detected. The reaction mixture was filtered and concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , dDichloromethane: methanol = 1:0 to 10:1) to give compound Int. (14.0 g, 33.9 mmol, 46.5% yield) as yellow solid. MS: 413.0 (M+H) ⁺ . ¹ H NMR: DMSO-d6 d (ppm) 8.87 (s, 1H), 5.95 (d, J = 5.2 Hz, 1H), 5.59 (d, J = 5.6 Hz, 1H), 5.28 (d, J = 8.8 Hz, 1H), 5.07 (t, J = 5.6 Hz, 1H), 4.53-4.50 (m, 1H), 4.17-4.15 (m, 1H), 3.98-3.97 (m, 1H), 3.69-3.67 (m, 1H), 3.61-3.58 (m, 1H). Step-2

To a solution of compound Int.2 (7.00 g, 16.9 mmol, 1.0 eq) in acetone (490 mL), was added 2,2-dimethoxypropane (10.6 g, 101.8 mmol, 12.4 mL, 6.0 eq) and p-TsOH.H ₂ O (2.90 g, 16.9 mmol, 1.0 eq) at 20°C. The resulting mixture was stirred at 20°C for 1 hr. TLC (petroleum ether: ethyl acetate = 1:1, Rf = 0.43) showed compound Int.2 was consumed and one major new spot with lower polarity was detected. The reaction mixture was quenched by addition NH3.H2O (2.5 mL) at 0°C and concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , Petroleum ether: Ethyl acetate = 0:1 to 1:1) to give compound Int.3 (7.00 g, 15.4 mmol, 91.1% yield) as yellow solid. MS: 453.0 (M+H) ^{+ 1} H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.78 (s, 1H), 6.20 (d, J = 2.0 Hz, 1H), 5.37-5.34 (m, 1H), 5.05 (t, J = 5.2 Hz, 1H), 4.96-4.94 (m, 1H), 4.29 (d, J = 5.2 Hz, 1H), 3.54 (t, J = 5.2 Hz, 2H), 1.55 (s, 3H), 1.34 (s, 3H).

Step-3

A solution of compound Int.3 (700.0 mg, 1.55 mmol, 1.00 eq), 2,2-difluoroethylamine (250.7 mg, 3.09 mmol, 2.00 eq) in t-BuOH (7 mL), was added TEA (782.4 mg, 7.73 mmol, 1.08 mL, 5.00 eq) at 25°C. The mixture was stirred at 65°C for 1 hr. LCMS analysis showed the starting material was consumed completely. The reaction mixture was concentrated under reduced pressure to give compound Int.4 (550.0 mg, crude) as yellow solid. MS: 498.0 (M+H) ⁺ . ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 10.17-9.83 (m, 1H), 8.35 (s, 1H), 6.36-5.99 (m, 2H), 5.32- 5.25 (m, 1H), 5.13-5.03 (m, 1H), 4.99-4.88 (m, 1H), 4.31-4.15 (m, 2H), 3.91-3.71 (m, 1H), 3.59- 3.46 (m, 2H), 1.54 (s, 3H), 1.33 (s, 3H).

Step-4

A solution of compound Int.4 (530.0 mg, crude) and tirmethylsilylacetylene (314.1 mg, 3.20 mmol, 442.9 mL, 3.00 eq) in DMF (5 mL), was added Pd(PPh3) ₂ Cl2 (74.8 mg, 106.5 mmol, 0.10 eq), TEA (227.7 mg, 2.25 mmol, 313.2 uL, 2.11 eq), CuI (20.3 mg, 106.6 mmol, 0.10 eq) at 25°C under N2. The resulting mixture was stirred at 25°C for 12 hrs under N2. LCMS analysis showed the starting material was consumed completely. The mixture was diluted with H2O (20 mL) and was extracted with EtOAc (20 mL x 3). The organic extract was dried over Na ₂ SO ₄ and was concentrated to give crude. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ ethyl acetate = 30/1 to 0/1) to give compound Int.5 (350.0 mg, 748.6 mmol, 70.2% yield) as yellow oil. MS: 468.3 (M+H) ⁺ . ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.51 (s, 1H), 8.34-8.24 (m, 1H), 6.34-6.01 (m, 2H), 5.31-5.23 (m, 1H), 5.15-5.09 (m, 1H), 4.98-4.92 (m, 1H), 4.26-4.20 (m, 1H), 4.00-3.75 (m, 2H), 3.58-3.50 (m, 2H), 1.55 (s, 3H), 1.34 (s, 3H), 0.26 (s, 9H).

Step-5

A solution of compound Int.5 (340.0 mg, 727.2 mmol, 1.00 eq) in NH ₃ .MeOH (7M, 4.00 mL, 38.5 eq) was stirred at 25°C for 0.5 hr. TLC (DCM: MeOH = 10:1) showed the starting material was consumed completely. The reaction mixture was concentrated under reduced pressure. The residue was purified by prep-TLC (SiO ₂ , EtOAc) to give compound Int.6 (200.0 mg, 505.8 mmol, 69.5% yield) as yellow oil. MS: 496.2 (M+H) ⁺ . ¹ H NMR 400 MHz DMSO-d ₆ d (ppm) 8.49 (s, 1H), 8.33 (s, 1H), 6.34-6.01 (m, 2H), 5.34-5.27 (m, 1H), 5.11 (t, J = 5.2 Hz, 1H), 4.98- 4.91 (m, 1H), 4.28-4.19 (m, 1H), 4.11 (s, 1H), 3.96-3.75 (m, 2H), 3.59-3.46 (m, 2H), 1.55 (s, 3H), 1.33 (s, 3H). Step-6

Int.6 Int.7 A solution of compound Int. 6 (200.0 mg, 505.8 mmol, 1.00 eq), azido(trimethyl)silane (87.4 mg, 758.8 umol, 99.8 uL, 1.50 eq), CuI (4.90 mg, 25.3 mmol, 0.05 eq) in DMF (1.8 mL) and MeOH (0.2 mL) was stirred at 90 °C for 12 hrs. LCMS analysis showed the starting material was consumed completely. The mixture was diluted with ice water (20 mL), extracted with EtOAc (15 mL x 5), the organic extract was dried over Na2SO4, and was concentrated to give a crude product. The residue was purified by prep-TLC (SiO ₂ , DCM: MeOH = 10:1) to give compound Int.7 (120.0 mg, 273.7 mmol, 54.1% yield) as yellow solid. MS: 439.2 (M+H) ⁺ . ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.52-8.38 (m, 1H), 8.32-8.20 (m, 1H), 6.45-6.10 (m, 2H), 5.42 (s, 1H), 5.18-5.45 (m, 2H), 4.23-4.18 (m, 1H), 4.12-3.89 (m, 3H), 3.67-3.47 (m, 2H), 1.57 (s, 3H), 1.35 (s, 3H) Step-7

A solution of compound Int.7 (120.0 mg, 273.7 mmol, 1.00 eq) in 10.0% aq.TFA (10 mL) was stirred at 25°C for 1 hr. LCMS analysis showed the starting material was consumed completely. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: 3_Phenomenex Luna C1875 * 30 mm * 3 mm; mobile phase: [water (0.2% FA) - ACN]; B%: 1% - 30%, 9 min) to give compound 2.50 (89.3 mg, 224.2 mmol, 81.9% yield, 100% purity) as white solid. MS: 399.2 (M+H) ⁺ . ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 15.97-14.93 (m, 1H), 8.64-8.14 (m, 3H), 6.46-6.09 (m, 1H), 5.98 (d, J = 6.0 Hz, 1H), 5.46 (d, J = 6.0 Hz, 1H), 5.23 (s, 1H), 5.13-5.04 (m, 1H), 4.72-4.65 (m, 1H), 4.23-4.18 (m, 1H), 4.15-3.91 (m, 3H), 3.75-3.66 (m, 1H), 3.62-3.52 (m, 1H). Similarly prepared by the method of Example 12 was:

● (2R,3R,4S,5R)-2-(6-(cyclobutylamino)-2-(1H-1,2,3-triazol-4-y l)-9H-purin-9-yl)-5- (hydroxymethyl)tetrahydrofuran-3,4-diol (2.51) by substituting cyclobutylamine for 2,2- difluoroethylamine in Step-3.

Table 6. Compounds 2.21–2.51 Spectrochemical Data

Example 13: Preparation of (1S,2R,3S,4R,5S)-4-(6-((2,2-difluoroethyl)amino)-2-(1H-1,2,3 - triazol-4-yl)-9H-purin-9-yl)-2,3-dihydroxy-N-methylbicyclo[3 .1.0]hexane-1-carboxamide (3.1)

Step-1

A mixture of Int 1 (30.0 g, 42.5 mmol, 1.00 eq), AcOH (315.0 g, 4.20 mol, 300.0 mL, 80.0% purity, 98.6 eq) in ACN (90 mL) was stirred at 30°C for 12 hrs under N ₂ atmosphere. The reaction mixture was basified with NH ₃ .H ₂ O, was adjusted to pH ~8, and was extracted with EtOAc (300 mL x 3). The combined extract was washed with brine (500 mL), was dried over Na2SO4, was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ ethyl acetate = 10/1 to 0/1) to give Int 2 (10.0 g, 21.6 mmol, 50.7% yield)as yellow solid: MS: 462.9 (M+H) ⁺ ; ¹ H NMR: 400 MHz CDCl3 d (ppm) 8.28 (s, 1H), 5.48 (d, J = 7.2 Hz, 1H), 4.97 (s, 1H), 4.66 (d, J = 7.2 Hz, 1H), 4.17 (d, J = 11.2 Hz, 1H), 3.61 (d, J = 11.6 Hz, 1H), 1.71-1.70 (m, 1H), 1.57 (s, 3H), 1.27- 1.21 (m, 4H), 1.04-1.03 (m, 1H)

Step-2

To a solution of Int 2 (9.00 g, 19.4 mmol, 1.00 eq) in acetonitrile (90 mL) was added IBX (7.08 g, 25.2 mmol, 1.30 eq) at 20°C. The resulting mixture was stirred at 80°C for 1 hr. TLC (petroleum ether: ethyl acetate = 1:1) analysis indicated ~0% of Int 2 was remained, and one major new spot with lower polarity was detected. The reaction mixture was filtered and used directly in the next step. Step-3

To the filtrate from Step-2 was added a solution of NaH ₂ PO ₄ (4.67 g, 38.9 mmol, 2.00 eq) in H2O (18 mL) and H2O ₂ (2.21 g, 19.4 mmol, 1.87 mL, 30.0% purity, 1.00 eq) at 20°C. Then a solution of NaClO ₂ (2.64 g, 23.3 mmol, 80.0% purity, 1.20 eq) in H2O (25.2 mL) was added drop wise at 0°C. The resulting mixture was stirred at 20°C for 1 hr. LC-MS analysis showed ~0% of compound Int 3 remained, and and ~76% of desired compound was detected. The reaction mixture was quenched by addition saturated aqueous Na2S2O3 (300 mL) at 0°C, and it was extracted with EtOAc (150 mL x 3). The combined extract was washed with brine (200 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give Int 4 (10.0 g, crude) as a yellow solid.: MS: 477.1 (M+H) ⁺ ; ¹ H NMR: 400 MHz CDCl3 d (ppm) 8.05 (s, 1H), 5.84 (d, J = 7.2 Hz, 1H), 4.96 (s, 1H), 4.72 (d, J = 6.4 Hz, 1H), 2.33-2.30 (m, 1H), 1.85-1.84 (m, 1H), 1.65-1.64 (m, 1H), 1.57 (s, 3H), 1.29 (s, 3H).

Step-4

To a solution of Int 4 (1.00 g, 2.10 mmol, 1.00 eq), MeNH2.HCl (141.6 mg, 2.10 mmol, 1.00 eq), DIEA (1.22 g, 9.44 mmol, 1.64 mL, 4.50 eq) in THF (10 mL), was added T3P (2.00 g, 3.15 mmol, 1.87 mL, 50.0% purity in EtOAc, 1.50 eq) at 25°C. The mixture was stirred at 25°C for 2 hr. TLC analysis (petroleum ether/ ethyl acetate = 0:1) showed the starting material was consumed completely. The reaction mixture was diluted with H2O (30 mL) and extracted with EtOAc (30 mL x 3). The combined extract was washed with brine (50 mL x 1), was dried over Na2SO4, was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ ethyl acetate = 50/1 to 0/1) to give Int 5 (800.0 mg, 1.63 mmol, 77.9% yield) as white solid: ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.59 (s, 1H), 7.77-7.69 (m, 1H), 5.59 (d, J = 7.2 Hz, 1H), 5.05 (s, 1H), 4.85 (d, J = 1.2, 1H), 2.69 (d, J = 4.5 Hz, 3H), 2.22-2.14 (m, 1H), 1.46 (s, 3H), 1.25-1.15 (m, 5H).

Step-5

To a solution of Int 5 (520.0 mg, 1.06 mmol, 1.00 eq), 2,2-difluoroethylamine (172.1 mg, 2.12 mmol, 2.00 eq) in t-BuOH (5 mL) was added TEA (537.2 mg, 5.31 mmol, 739.1 mL, 5.00 eq) at 25°C. The mixture was stirred at 65°C for 2 hrs. LCMS analysis showed the starting material was consumed completely. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ ethyl acetate = 20/1 to 0/1) to give Int 6 (500.0 mg, 935.8 mmol, 88.1% yield) as yellow solid: MS: 535.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.51-8.35 (m, 1H), 8.10 (s, 1H), 7.71-7.61 (m, 1H), 6.32-6.00 (m, 1H), 5.58 (d, J = 7.2 Hz, 1H), 4.93 (s, 1H), 4.74 (d, J = 6.8 Hz, 1H), 3.89-3.68 (m, 2H), 2.67 (d, J = 4.4 Hz, 3H), 2.11-2.03 (m, 1H), 1.48-1.41 (m, 4H), 1.23- 1.19 (m, 4H).

Step-6

To a solution of Int 6 (500.0 mg, 935.8 mmol, 1.00 eq) and trimethylsilylacetylene (275.7 mg, 2.81 mmol, 388.9 mL, 3.00 eq) in DMF (10 mL) was added Pd(PPh3) ₂ Cl2 (65.7 mg, 93.5 mmol, 0.10 eq), TEA (199.9 mg, 1.98 mmol, 275.1 mL, 2.11 eq), and CuI (17.8 mg, 93.6 umol, 0.10 eq) at 25°C under N ₂ . The resulting mixture was stirred at 25°C for 12 hrs under N ₂ . LCMS analysis showed Int 7 was consumed completely. The mixture was diluted with H2O (20 mL) and was extracted with EtOAc (20 mL x 3). The combined extract was dried over Na ₂ SO ₄ and was concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO ₂ , petroleum ether/ ethyl acetate = 30/1 to 0/1) to give Int 7 (350.0 mg, 693.6 mmol, 74.1% yield) as yellow oil: MS: 505.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 8.34-8.26 (m, 1H), 8.21 (s, 1H), 7.71 (d, J = 4.4 Hz, 1H), 6.35-6.00 (m, 1H), 5.59 (d, J = 6.8 Hz, 1H), 4.98 (s, 1H), 4.72 (d, J = 6.8 Hz, 1H), 4.04-3.71 (m, 2H), 2.64 (d, J = 4.4 Hz, 3H), 2.15-2.09 (m, 1H), 1.52-1.45 (m, 4H), 1.22-1.15 (m, 4H), 0.27 (s, 9H). Step-7

A solution of Int 7 (330.0 mg, 653.9 umol, 1.00 eq), K2CO3 (451.9 mg, 3.27 mmol, 5.00 eq) in MeOH (10 mL) was stirred at 25°C for 1 hr. LCMS analysis showed the starting material was consumed completely. The reaction mixture was filtered through silica gel and was concentrated under reduced pressure. The residue was purified by prep-TLC (SiO ₂ , DCM/ MeOH = 15/1) to give Int 8 (200.0 mg, 462.5 mmol, 70.7% yield) as yellow solid: MS: 433.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.32 (s, 1H), 8.24 (s, 1H), 7.75-7.69 (m, 1H), 6.33-5.99 (m, 1H), 5.61 (d, J = 7.2 Hz, 1H), 4.98 (s, 1H), 4.74 (d, J = 7.2 Hz, 1H), 4.14-4.07 (m, 1H), 4.01-3.76 (m, 2H), 2.65 (d, J = 4.4 Hz, 3H), 2.12-2.06 (m, 1H), 1.51-1.42 (s, 4H), 1.25-1.18 (m, 4H).

Step-8

A solution of Int 8 (190.0 mg, 439.3 umol, 1.00 eq), TMSN ₃ (75.9 mg, 659.1 mmol, 86.6 mL, 1.50 eq), CuI (4.18 mg, 21.9 umol, 0.05 eq) in DMF (2.7 mL) and MeOH (0.3 mL) was stirred at 90°C for 12 hrs. The mixture was diluted with ice water (20 mL) and was extracted with EtOAc (15 mL x 5). The combined extract was dried over Na2SO4, and was concentrated to give a residue. The residue was purified by prep-TLC (SiO ₂ , DCM/ MeOH = 10/1) to give Int 9 (100.0 mg, 210.3 mmol, 47.8% yield) as yellow solid: MS: 476.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO- d ₆ ; d (ppm) 15.84-14.99 (m, 1H), 8.42-8.16 (m, 3H), 7.87-7.63 (m, 1H), 6.47-6.07 (m, 1H), 6.01- 5.82 (m, 1H), 5.07 (s, 1H), 4.91 (d, 1H), 4.09-3.89 (m, 2H), 2.64-2.53 (m, 3H), 2.11-1.98 (m, 1H), 1.58-1.51 (m, 1H), 1.48 (s, 3H), 1.18-1.22 (s, 4H).

Step-9

A solution of Int 9 (100.0 mg, 210.3 mmol, 1.00 eq) in 80.0% aq.TFA (10 mL) was stirred at 25°C for 1 hr. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Phenomenex Gemini-NX C1875 * 30 mm * 3 mm; mobile phase: [water (0.05% NH ₃ H ₂ O + 10 mM NH ₄ HCO ₃ ) - ACN]; B%: 1% - 20%, 8 min) to give 3.1 (36.6 mg, 83.3 mmol, 39.6% yield, 99.1% purity) as a white solid.: MS: 436.2 (M+H) ⁺ ; ¹ H NMR 400 MHz DMSO-d6 d (ppm) 15.92-14.72 (m, 1H), 8.33 (s, 1H), 8.26-8.14 (m, 2H), 7.70 (s, 1H), 6.46-6.07 (m, 1H), 5.38-5.22 (m, 2H), 4.91-4.78 (m, 2H), 4.17-3.90 (m, 3H), 2.63 (d, J = 4.4 Hz, 3H), 1.86-1.78 (m, 1H), 1.53 (t, J = 4.4 Hz, 1H), 1.38-1.30 (m, 1H). Example 14. Preparation of (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(6-(propylamino)-2- (4-(pyridin-2-yl)-1H-pyrazol-1-yl)-9H-purin-9-yl)tetrahydrof uran-2-carboxamide (4.1)

1.8 To a solution of 1.8 (200 mg, 398.2 mmol, 1.0 eq) and 2-(1H-pyrazol-4-yl)pyridine (69.4 mg, 477.8 umol, 1.2 eq) in DMF (5 mL) was added CuI (10.6 mg, 55.7 mmol, 0.14 eq) and Cs2CO3 (181.6 mg, 557.4 mmol, 1.4 eq) under N ₂ . The mixture was stirred at 25°C for 24 h. The reaction mixture was partitioned between DCM (10 mL×10) and H2O (20 mL). The organic phase was separated, was washed with brine (10 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by prep-TLC (DCM:MeOH = 15:1) to obtain Int 1 (80 mg, 154.0 mmol, 38.6% yield) as yellow solid: MS: 520.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz CDCl3 d (ppm) 9.07 (s, 1H), 8.64 (d, J = 4.8 Hz, 1H), 8.32 (s, 1H), 7.76-7.73 (m, 3H), 7.20-7.18 (m, 1H), 7.05 (s, 1H), 6.09 (s, 1H), 5.95 (t, J = 5.6 Hz, 1H), 5.45 (s, 1H), 5.36-5.34 (m, 1H), 4.76 (s, 1H), 3.74 (s, 2H), 2.66 (s, 3H), 1.80-1.75 (m, 2H), 1.65 (s, 3H), 1.40 (s, 3H), 1.07 (t, J = 7.6 Hz, 3H).

Step-2 Int 1 from Step-1 (80 mg, 154.0 mmol, 1.0 eq) was dissolved in aq. TFA (2.0 mL, 80%). The mixture was stirred at 25°C for 1 h. The mixture was concentrated under reduced pressure and was purified by Prep-HPLC (column: mobile phase: [water (0.05% NH3H2O+10 mM

NH ₄ HCO ₃ )-ACN]; B%: 10%-40%, 10 min) to obtain compound 4.1 (40 mg, 83.4 mmol, 54.1% yield, 100% purity) as a white solid: MS: 480.1 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 9.10 (s, 1H), 8.58 (d, J = 4.8 Hz, 1H), 8.46 (s, 1H), 8.35-8.34 (m, 2H), 8.10-7.83 (m, 1H), 7.89- 7.83 (m, 2H), 7.28-7.26 (m, 1H), 6.03 (d, J = 7.2 Hz, 1H), 5.72 (d, J = 4.4 Hz, 1H), 5.60 (d, J = 6.4 Hz, 1H), 4.78-4.73 (m, 1H), 4.35 (d, J = 2.0 Hz, 1H), 4.24 (s, 1H), 3.61-3.56 (m, 2H), 2.68 (d, J = 4.4 Hz, 3H), 1.73-1.66 (m, 2H), 0.96 (t, J = 7.6 Hz, 3H).

Example 15, Preparation of (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(6-(propylamino)-2- (1-(pyridin-2-yl)-1H-pyrazol-4-yl)-9H-purin-9-yl)tetrahydrof uran-2-carboxamide (5.1)

To a solution of 2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazo l-1-yl)pyridine (134.9 mg, 497.7 mmol, 1.00 eq), compound 1.8 (250.0 mg, 497.7 mmol, 1.00 eq), K2CO3 (206.4 mg, 1.49 mmol, 3.00 eq) in dioxane (6 mL) and H2O (1 mL) was added Pd(dppf)Cl2 (36.4 mg, 49.7 mmol, 0.10 eq), then the mixture was stirred at 85°C for 2 hrs. The reaction mixture was diluted with H ₂ O (15 mL) and was extracted with EtOAc (15 mL x 3). The combined organic extract was washed with brine (30 mL x 1), was dried over Na2SO4, filtered and was

concentrated under reduced pressure to give a residue. The residue was purified by prep-TLC (SiO ₂ , EtOAc: MeOH = 15:1) to give Int 1 (200.0 mg, 384.9 mmol, 77.3% yield) as yellow oil: MS: 520.3 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 9.04 (s, 1H), 8.55 (d, J = 4.0 Hz, 1H), 8.34 (s, 1H), 8.23 (s, 1H), 8.07-7.96 (m, 2H), 7.87-7.80 (m, 1H), 7.44-7.32 (m, 2H), 6.43 (s, 1H), 5.66-5.61 (m, 1H), 5.38 (d, J = 6.0 Hz, 1H), 4.61 (d, J = 1.6 Hz, 1H), 3.62-3.44 (m, 2H), 2.13 (d, J = 4.4 Hz, 3H), 1.72-1.61 (m, 2H), 1.56 (s, 3H), 1.36 (s, 3H), 0.94 (t, J = 7.2 Hz, 3H).

A solution of Int 1 from Step-1 (200.0 mg, 384.9 mmol, 1.00 eq) in 80.0% aq.TFA (5 mL) was stirred at 25°C for 2 hrs. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Waters Xbridge Prep OBD C18150 * 40 mm * 10 mm; mobile phase: [water (0.05% NH ₃ H ₂ O + 10 mM NH ₄ HCO ₃ ) - ACN]; B%: 25% - 50%, 8 min) to give compound 5.1 (86.0 mg, 179.3 mmol, 46.6% yield, 100.0% purity) as white solid: MS: 480.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d ₆ d (ppm) 9.02 (s, 1H), 8.56-8.52 (m, 1H), 8.43 (s, 1H), 8.31 (s 1H), 8.07-7.94 (m, 3H), 7.90 (s, 1H), 7.44-7.37 (m, 1H), 6.05 (d, 1H), 5.68 (d, J = 4.4 Hz, 1H), 5.58 (d, J = 6.4 Hz, 1H), 4.90-4.81 (m, 1H), 4.37-4.29 (m, 2H), 3.64-3.47 (m, 2H), 2.59 (d, J = 4.4 Hz, 3H), 1.76-1.58 (m, 2H), 0.95 (t, J = 7.2 Hz, 3H).

Example 16. Preparation of (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(6-(propylamino)-2- (3-(pyridin-2-yl)isoxazol-5-yl)-9H-purin-9-yl)tetrahydrofura n-2-carboxamide (6.1)

To a solution of picolinaldehyde (2.00 g, 18.6 mmol, 1.00 eq) in EtOH (150 mL) was added NH2OH.HCl (1.56 g, 22.4 mmol, 1.20 eq) and NaOAc (1.84 g, 22.4 mmol, 1.20 eq) at 20°C. The resulting mixture was stirred at 60°C for 2 hrs. TLC analysis (petroleum ether: ethyl acetate = 5:1) indicated ~0% of starting aldehyde remained, and one major new spot with greater polarity was detected. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was diluted with H ₂ O (50 mL) and was extracted with DCM (20 mL x 6). The combined extract was washed with brine (50 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give the intermediate oxime (2.20 g, crude) as a pink solid. This was taken up in DMF (25 mL) and NCS (2.65 g, 19.8 mmol, 1.1 eq) was added at 20°C. The resulting mixture was stirred at 20°C for 12 hrs. TLC (petroleum ether: ethyl acetate = 5:1) indicated ~0% of the oxime remained, and one major new spot with lower polarity was detected. The reaction mixture was diluted with H ₂ O (80 mL) and was extracted with EtOAc (30 mL x 6). The combined extract was washed with brine (80 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to obtain Int 1 (4.50 g, crude) as brown oil: MS: 157.1 (M+H) ⁺ ; ¹ H NMR: 400 MHz CDCl3 d (ppm) 9.49 (s, 1H), 8.74-8.72 (m, 1H), 8.02 (s, 1H), 7.81-7.76 (m, 1H), 7.39-7.36 (m, 1H).

Step-2

To a solution of compound 2.16 (250.0 mg, 624.3 mmol, 1.00 eq) in THF (10 mL), and the crude product of step-1(488.7 mg, 3.12 mmol, 5.00 eq), NaHCO3 (104.9 mg, 1.25 mmol, 2.00 eq.) was added at 0 ^o C. The mixture was stirred at 20 ^o C for 12 hr. The reaction mixture was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by prep- TLC (SiO ₂ , EtOAc) to give Int 2 (200.0 mg, 384.2 mmol, 61.5% yield) as yellow oil: MS: 521.3 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.77-8.81 (m, 1H), 8.38 (s, 1H), 8.08-8.13 (m, 1H), 8.04-7.98 (m, 1H), 7.95 (s, 2H), 7.57-7.54 (m, 1H), 7.43-7.36 (m, 1H), 6.45 (d, J = 0.8 Hz, 1H), 5.62-5.58 (m, 1H), 5.42 (d, J = 6.8 Hz, 1H), 4.61 (d, J = 2.0 Hz, 1H), 3.59-3.50 (m, 2H), 2.15 (d, J = 4.6 Hz, 3H), 1.62-1.73 (m, 2H.

Step-3

A solution of Int 2 from step-2 (200.0 mg, 384.2 mmol, 1.00 eq) in 80.0% aq.TFA (5 mL) was stirred at 25°C for 1 hr. LCMS analysis showed the starting material was consumed completely. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (column: Waters Xbridge Prep OBD C18150 * 40 mm * 10 mm; mobile phase: [water (0.04% HCl) - ACN]; B%: 20% - 45%, 8 min) to give the hydrochloride salt of compound 6.1 (56.4 mg, 117.4 mmol, 56.4% yield) as white solid.: MS: 481.1 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.77 (d, J = 4.0 Hz, 1H), 8.59 (s, 1H), 8.26 (s, 1H), 8.12 (d, J = 7.6 Hz, 1H), 8.07-7.96 (m, 2H), 7.63-7.47 (m, 2H), 6.07 (d, J = 7.2 Hz, 1H), 5.73 (d, J = 4.4 Hz, 1H), 5.62 (d, J = 6.4 Hz, 1H), 4.87-4.77 (m, 1H), 4.35 (d, J = 1.8 Hz, 1H), 4.28 (s, 1H), 3.56 (s, 2H), 2.66 (d, J = 4.4 Hz, 3H), 1.75-1.62 (m, 2H), 0.95 (t, J = 7.4 Hz, 3H). Example 17. Preparation of (2S,3S,4R,5R)-3,4-dihydroxy-N-methyl-5-(6-(propylamino)-2- (5-(pyridin-2-yl)-1,2,4-oxadiazol-3-yl)-9H-purin-9-yl)tetrah ydrofuran-2-carboxamide (7.1)

To a solution of compound 1.8 (1.0 g, 1.99 mmol, 1.0 eq) in NMP (15 mL) was added Zn(CN) ₂ (1.17 g, 9.95 mmol, 631.8 mL, 5.0 eq) and Pd(PPh ₃ ) ₄ (230.1 mg, 199.1 mmol, 0.1 eq) at 25°C under N ₂ . The mixture was stirred at 100°C for 16 h. LCMS analysis showed complete reaction. The mixture was partitioned between ethyl acetate (10 mL×3) and H ₂ O (20 mL). The organic phase was separated, was washed with brine (10 mL), was dried over Na2SO4, was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by silica gel chromatography (DCM :MeOH =20:1) to obtain Int 1(2.3 g, 1.83 mmol, 92.1% yield, 32% purity) as yellow oil: MS: 402.2 (M+H) ⁺ ; ¹ H NMR: 400 MHz CDCl3 d (ppm) 7.94 (s, 1H), 7.35 (s, 1H), 6.18 (s, 1H), 5.98 (d, J = 4.0 Hz, 1H), 3.62-3.60 (m, 2H), 4.70 (d, J = 2.0 Hz, 1H), 3.56 (s, 2H), 2.85 (d, J = 5.2 Hz, 3H), 1.74-1.68 (m, 2H), 1.638 (s, 3H), 1.37 (s, 3H), 1.01 (t, J = 7.6 Hz, 3H).

Step-2

A solution of Int 1, NH ₂ OH.HCl (155.1 mg, 2.23 mmol, 2.0 eq) and NaHCO ₃ (468.8 mg, 5.58 mmol, 5.0 eq) was dissolved in H2O (6 mL) and stirred at 20°C for 15 min. Then the product of Step-1 (1.4 g, 1.12 mmol, 32% purity, 1.0 eq) in MeOH (14 mL) was added drop-wise to the mixture. The resulting mixture was stirred at 20°C for 0.5 h. TLC (DCM:MeOH = 20:1) showed complete reaction. The mixture filtrated and concentrated under reduced pressure to obtain Int 2 (380 mg, crude) as a white solid: MS: 435.1 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 9.90 (s, 1H), 8.28 (s, 1H), 7.88 (s, 1H), 7.58-7.55 (m, 1H), 6.40 (s, 1H), 5.68 (s, 2H), 5.52 (dd, J = 6.4 Hz, J = 2.0 Hz, 1H), 5.33 (d, J = 6.4 Hz, 1H), 4.59 (s, 1H), 3.45 (brs, 2H), 3.32 (s, 3H), 1.65-1.54 (m, 2H), 1.53 (s, 3H), 1.34 (s, 3H), 0.88 (t, J = 7.6 Hz, 3H).

Step-3

To a solution of Int 2 (200 mg, 460.3 mmol, 1.0 eq) in DMF (3 mL) was added picolinoyl chloride (122.9 mg, 690.5 mmol, 1.5 eq, HCl) and DIPEA (297.5 mg, 2.30 mmol, 400.9 uL, 5.0 eq). The reaction mixture was stirred at 120°C for 2 h. LCMS analysis showed complete reaction. The mixture was partitioned between DCM (10 mL × 5) and H ₂ O (15 mL). The organic phases was separated, was washed with brine (10 mL), was dried over Na ₂ SO ₄ , was filtered and was concentrated under reduced pressure to give a residue. The residue was purified by prep- TLC (DCM:MeOH = 15:1) to obtain Int 3 (200 mg, 383.5 mmol, 83.3% yield) as yellow solid: MS: 522.0 (M+H) ⁺ ; ¹ H NMR: 400 MHz CDCl3 d (ppm) 8.88-8.87 (m, 1H), 8.45 (d, J = 8.0 Hz, 1H), 8.00-7.96 (m, 1H), 7.90 (s, 1H), 7.58-7.54 (m, 1H), 7.07 (brs, 2H), 6.10 (d, J = 3.2 Hz, 2H), 5.43-5.38 (m, 2H), 4.72 (s, 1H), 3.79 (brs, 2H), 2.66 (d, J = 4.8 Hz, 2H), 1.80-1.74 (m, 2H), 1.66 (s, 3H), 1.40 (s, 3H), 1.07 (t, J = 7.6 Hz, 3H). Step-4

Int 3 from Step-3 (200 mg, 383.5 mmol, 1.0 eq) was dissolved in aq.TFA (3 mL, 80%) and the mixture was stirred at 25°C for 1 h. The mixture was concentrated under reduced pressure. The residue was purified by Pre-HPLC (column: mobile phase: [water (0.05%NH ₃ H ₂ O+10mM NH4HCO3)-ACN]; B%: 8%-38%, 10 min) to obtain 7.1 (60 mg, 124.40 mmol, 32.4% yield, 99.8% purity) as white solid: MS: 482.1 (M+H) ⁺ ; ¹ H NMR: 400 MHz DMSO-d6 d (ppm) 8.87 (d, J = 4.0 Hz, 1H), 8.63 (s, 1H), 8.36-8.28 (m, 2H), 8.16-8.11 (m, 2H), 7.76-7.73 (m, 1H), 6.10 (d, J = 7.2 Hz, 1H), 5.75 (d, J = 4.4 Hz, 1H), 5.64 (d, J = 6.4 Hz, 1H), 4.76-4.71 (m, 1H), 4.36- 4.35 (m, 1H), 4.25-4.23 (m, 1H), 3.57-3.55 (m, 2H), 2.63 (d, J = 4.8 Hz, 3H), 1.71-1.64 (m, 2H), 0.94 (t, J = 7.6 Hz, 3H).

Table 7. Compounds 3.1– 7.1 Spectrochemical Data

Example 18: Intracellular Calcium Relsease Assay

[00384] This example demonstrates the effect on intracellular calcium levels in either CHO- K1 or HEK293 cells stably expressing the four subtypes of adenosine receptors that were induced by test compounds, in accordance with an embodiment of the invention.

[00385] Cell Culture. The table below lists the cell lines that stably express the 4 subtypes of adenosine receptors, along with the growth medium used for each:

For experiments with the ADORA1- and ADORA ₃ -expressing cells, the medium was aspirated and the cells were washed twice with 10 mL DPBS. Two mL of trypsin was added and incubated at 37 °C for 1 minute. Then 10 mL of platting media was added to terminate the digestion and 1 mL of the solution was taken out for cell counting. ADORA2A- and

ADORA2B-expressed cells were thawed rapidly in a 37℃ water bath. Cell suspensions were transferred to 50 mL conical tubes. Plating media were added to the 10 mL mark and then 1 mL was taken out for cell counting. The 50 mL tubes containing the various types of cells were centrifuged at 1000 g. Then the supernatants are aspirated, being careful not to aspirate the cells. The cell pellets were resuspended in 3-5 mL platting media, then 0.5 mL was taken out for cell counting. Then the cell suspension was diluted to 1×10 ⁶ cells/mL (20,000 cells per 20 µL per well) in platting medium, and cells were seeded into 384-well cell plates (Greiner-781946). The 384-well cell plated were place in a 37 °C / 5% CO ₂ incubator (Thermo-371, Thermo Scientific) for 16-20 hours.

[00386] Preparation of the intracellular calcium imaging agent (Fluo-4 Direct ^TM Calcium Assay Kit, Invitrogen-F10471, Thermo Scientific). One mL of FLIPR Assay Buffer was added to 77 mg probenecid to make a 250 mM solution, which was used fresh for each day. One vial of Fluo-4 Direct ^TM crystals was thawed and 10 mL of FLIPR Assay Buffer was added to the vial. 0.2 mL of probenecid was added to each 10 mL vial of Fluo-Direct ^TM solution, such that the final assay concentration was 2.5 mM. It was vortexed and left to stand > 5 min, protected from light. The dye was prepared fresh each day.

[00387] Compound Preparation. Compound plates were prepared as follows. First, the test compound was diluted to prepare a 2 mM solution and then 10-point 3-fold serial dilutions were made using ECHO (ECHO 555, LabCyte), then 900 nL was transferred to the compound plate. For all targets, the final top concentration of the test compound was 10 mM. For agonist reference compounds, 10-point and 3-fold serial dilutions were made, then 900 nL was transferred to the assay plate. Then 30 mL of assay buffer was added to the compound plate and then the plate was centrifuged at 1000 rpm for 1 min.

[00388] FLIPR Assay. Cell plates were removed from the incubator, to which were added 20 mL 2×Fluo-4 Direct ^TM solution, then the plates were reincubated in a 5% CO ₂ , 37 °C incubator for 50 min and at RT for 10 min. To run the protocol on the Fluorescent Imaging Plate Reader (FLIPR) TETRA (MD-FT0249, Molecular Devices, Inc.), 10 µL of assay buffer was transferred from the 384-well plate (Greiner-781280) to the cell plates and then the fluorescence signal was read. Then 10 µL of compound solution was tranferred from the compound plate to the cell plates and the fluorescence signal was read. The“Max-Min” was calculated, starting from Read 91 to the maximum allowed. For agonists, activation%= (RLU-LC)/(HC-LC)*100, based on the following: RLU = relative light unit, 91 to maximum allowed signal; HC = average signal of the high concentration of agonist; LC = average signal of DMSO well. The data were fitted using GraphPad Prism 5, using the model“log(agonist) vs. response -- Variable slope” to determine the EC ₅ 0 value. The receptor efficacy of the test compound relative to the agonist NECA was calculated as a percentage of the response to 1 µM NECA. Table 8 includes EC ₅₀ values for compounds described herein. Compounds having an EC ₅ 0 of < 33 nM as +++, EC ₅ 0 of 33 nM to 100 nM as ++, and EC ₅ 0 of >100 nM as +.

Table 8. Adenosine Receptor (A ₃ ) EC ₅ 0 Bioassay Data

Example 19: Neuropathic Pain Animal Model

[00389] This example illustrates the performance of compounds in accordance with an embodiment of the invention in an in vivo model of neuropathic pain.

[00390] Male CD-1 mice (25-30 g) from Harlan (Indianapolis, Ind.) were housed 4-5 (for mice) per cage in a controlled environment (12 h light/dark cycles) with food and water available ad libitum. Experiments were performed in accordance with International Association for the Study of Pain, NIH guidelines on laboratory animal welfare and Saint Louis University Institutional Animal Care and Use Committee recommendations. Experimenters were blinded to treatment conditions in all experiments.

[00391] Chronic Constriction injury (CCI) to the sciatic nerve of the left hind leg in mice was performed under general anesthesia using the well characterized Bennett model (Bennett, G. J. et al., Pain 1988, 33, 87-107). Briefly, mice (weighing 25-30 g at the time of surgery) were anesthetized with 3% isoflurane/100% O ₂ inhalation and maintained on 2% isoflurane/100% O ₂ for the duration of surgery. The left thigh was shaved, scrubbed with Nolvasan (Zoetis, Madison, N.J.), and a small incision (1-1.5 cm in length) was made in the middle of the lateral aspect of the left thigh to expose the sciatic nerve. The nerve was loosely ligated around the entire diameter of the nerve at three distinct sites (spaced 1 mm apart) using silk sutures (6.0). The surgical site was closed with a single muscle suture and a skin clip. Pilot studies established that under the experimental conditions peak mechano-allodynia developed by day 5-day 7 following CCI. Test substances or their vehicles are administered as 3 mmol/kg doses given by gavage (0.2 ml p.o.) at peak mechano-allodynia (day 7). The vehicle used consists of 10% DMSO in 0.5% methylcellulose (diluted from a 5 mM stock solution in DMSO). Methylcellulose was obtained from Sigma viscosity 400 cP and prepared in sterile distilled water (UPS).

[00392] Mechano-allodynia was measured in CCI after first acclimating the animals to elevated cages with a wire mesh floor for 15 min. The plantar aspect of hindpaws were probed 3 times with calibrated von Frey filaments (Stoelting, Wood Dale, IL, USA; 0.07–2.00 g) according to the“up-and-down” method. The development of mechano-allodynia was evidenced by a significant (P < 0.05) reduction in the mean paw withdrawal threshold (PWT), such the animals now exhibit a pain-related response to a level of mechanical stimulation that they ignored prior to CCI-induced nerve injury. Test substances or their vehicles were given orally (PO) by gavage (0.1 mL) on Day 7 ± 1 after surgery, which is the time of peak mechano- allodynia. Results for compounds 1.76, 1.62, 1.45, 2.35, 1.68, 1.72, and 1.58 in the mouse CCI model are shown in FIGS.1 to 7, which depicts the paw withdrawal threshold for the ipsilateral paw and contralateral paw vs. time after oral dosing (t = 0). Example 20: Statistical Analysis for In Vivo Experiments.

[00393] Data are expressed as mean±SEM for n animals. Behavioral data are analyzed by two-way ANOVA with Bonferroni comparisons. Significant differences are defined at a P<0.05. All statistical analysis is performed using GraphPad Prism (v5.03, GraphPad Software, Inc., San Diego, Calif.).

[00394] The assay is performed as described in Chen, Z. et al., FASEB J.2012, 26, 1855- 1865 and Paoletta, S. et al., J. Med. Chem.2013, 56, 5949-5963.