This Application relates to compounds and compositions for treating diseases associated with cysteine protease activity, particularly diseases associated with activity of cathepsin S.

DESCRIPTION OF THE FIELD Cysteine proteases represent a class of peptidases characterized by the presence of a cysteine residue in the catalytic site of the enzyme. Cysteine proteases are associated with the normal degradation and processing of proteins. The aberrant activity of cysteine proteases, e. g., as a result of increase expression or enhanced activation, however, may have pathological consequences. In this regard, certain cysteine proteases are associated with a number of. disease states, including arthritis, muscular dystrophy, inflammation, tumor invasion, glomerulonephritis, malaria, periodontal disease, metachromatic leukodystrophy and others.

An increase in cathepsin S activity contributes to the pathology and/or symptomatology of a number of diseases. Accordingly, molecules that inhibit the activity of cathepsin S protease are useful as therapeutic agents in the treatment of such diseases.

SUMMARY OF THE INVENTION This Application relates to compounds of Formula I:

I in which: X1 is -NHC(R1)(R2)X3 or -NHX4 ; X2 is hydrogen, fluoro, -OH, -OR4, -NHR15 or -NR17R18 and X7 is hydrogen or X2 and X7 both represent fluoro; X3 is cyano,-C (R7)(R8)R16,-C(R6)(OR6)2,-CH2C(O)R16,-CH=CHS(O)2R5, -C(O)CF2C(O)NR5R5,-C(O) C (O) NR5R6,-C(O) C (O) OR5,-C (O) CH20R, -C(O)CH2N(R6)SO2R5 or-C (O) C (O) R5 ; wherein R5 is hydrogen, (C1-4) alkyl, (C3-10)cycloalkyl(C0-6) alkyl, hetero (C3-10)cycloalkyl(C0-3) alkyl, (C6-10)aryl(C0-6) alkyl, hetero (C5-lo) aryl (CO-6) alkyl, (C9-10) bicycloaryl (C0-6) alkyl or hetero (C8-lo) bicycloaryl (Co-6) alkyl; R6 is hydrogen, hydroxy or (Cl 6) alkyl ; or where X3 contains an -NR5R6 group, R and R6 together with the nitrogen atom to which they are both attached, form hetero (C3-lo) cycloalkyl, hetero (C5-10) aryl or hetero (C8-10)bicycloaryl ; R7 is hydrogen or (Cl 4) alkyl and R8 is hydroxy or R7 and R8 together form oxo; R'6 is hydrogen,- X4,-CF3,-CF2CF2R9 or-N (R6) OR6 ; R9 is hydrogen, halo, (C1-4)alkyl, (C5-10)aryl(C0-6)alkyl or (C5 IO) heteroaryl (C0-6)alkyl, with the proviso that when X3 is cyano, then X2 is hydrogen, fluoro,-OH,-OR4 or -NR17R18 and X7 is hydrogen or X2 and X7 both represent fluoro; X4 comprises a heteromonocyclic ring containing 4 to 7 ring member atoms or a fused heterobicyclic ring system containing 8 to 14 ring member atoms and any carbocyclic ketone, iminoketone or thioketone derivative thereof, with the proviso that when -X4 is other than a heteromonocyclic ring containing 5 ring member atoms, wherein no more than two of the ring member atoms comprising the ring are heteroatoms, then X2 is fluoro, -OH, -OR4, -NHR15 or -NR17R18 and -X7 is hydrogen or X2 and X7 both represent fluoro; wherein within R%,X3 or X4 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (CI 6) alkyl, (C1-6) alkylidene,

cyano, halo, halo-substitued(C1-4)alkyl, nitro-X5NR12R12, -X5NR12C(O)R12, -X5NR¹²C(O)OR¹², -X5NR¹²C(O)NR¹²R¹², -X5NR¹²C(NR¹²)NR¹²R¹², -X5OR¹, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13 and -X5S(O)2R13 and/or 1 radical selected from -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5O(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12(C(NR12)NR14R12, wherein X5 is a bond or (Ci-6) alkylene; Rl2 at each occurrence independently is hydrogen, (C1-6) alkyl or halo-substituted (CI 6) alkyl; R13 is (C1-6) alkyl or halo-substituted (C1-6) alkyl; and R14 is (C3 0) cycloalkyl (Co 6) alkyl, hetero (C3-10)cycloalyl(C0-3)alkyl, (C6-10) aryl (C0-6) alkyl, hetero (C5 10) aryl (Co-6) alkyl, (C9-lo) bicycloaryl (Co-6) alkyl or hetero (C8, o) bicycloaryl (Co-6) alkyl; R'is hydrogen or (C-6) alkyl and R is selected from a group consisting of hydrogen, cyano -X5NR12R12, -X5NR12C(O)R12,-X5NR12C(O)OR12,-R12,-X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12,. -X5NR12C(O)R13, -X5S(O)R13,-X5S(O)2R13, -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wherein X5, R12, Rl3 and R14 are as defined above; or Rl and R2 taken together with the carbon atom to which both Rl and R2 are attached form (C3-8) cycloalkylene or (C3-8)heterocycloalkylene ; wherein within said R any heteroaryl, aryl, cycloalkyl, heterocycloalkyl, cycloalkylene or heterocycloalkylene is unsubstituted or substituted with 1 to 3 radicals independently selected from (C1-6)alkyl, (Ci-6) alkylidene, cyano, halo, halo-substituted (Cl 4) alkyl, nitro,-XSNR12R'2,-X5NRzC O) R'2, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13 and -X5C(O)R13, wherein X5,R12 and R13 are as defined above; R3 is (Cl 6) alkyl or-C (R6) (R6) X6, wherein R6 is hydrogen or (Cl 6) alkyl and X6 is selected from -X5NR12R12,-X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12,-X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12,

-X5OP(O)(OR12)OR12, -X5C(O)R13, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13, -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12(C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12(C(O)NR14R12 and -X5NR12C(NR12)NR14R12 wherein X5, R12, R13 and R14 are as defined above; R4 is selected from -X8NR12R12, -X8NR12C(O)R12, -X8NR12C(O)OR12, -X8NR12C(O)NR12R12, -X8NR12C(NR12)NR12R12, -X8OR12, -X8SR12, -X5C(O)OR12, -X5C(O)R12, -X8OC(O)R12, -X5C(O)NR12R12, -X8S(O)2NR12R12, -X8NR12S(O)2R12, -X8P(O)(OR12)OR12, -X8OP(O)(OR12)OR12, -X5C(O)R13,-X8NR12C(O)R13, -X8S(O)R13, -X8S(O)2R13, -R14, -X8OR14, -X8SR14, -X8S(O)R14, -X8S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X8OC(O)R14M, -X8NR14R12, -X8NR12C(O)R14, -X8NR12C(O)OR14, -X5C(O)NR14R12, -X8S(O)2NR14R12, -X8NR12S(O)2R14, -X8NR12C(O)NR14R12 and -X8NR12C(NR12)NR14R12 wherein X8 is (C1-6)alkylene and X5,R12,R13 and R14 are as defiend above, with the proviso that when X3 is cyano and X2 is-OR4, where R4 is defined as-Rl4, then R14 is (C3-10)cycloalkyl(C1-6)alkyl, hetero (C3-10)cycloalkyl(C1-3) alkyl, (C6-10)aryl(C1-6)alkyl, hetero (C5-10) aryl (Cl 6) alkyl, (C9-10)bicycloaryl(C1-6) alkyl or hetero (C8-10)bicycloaryl(C1-6) alkyl; Rl5 is (C6-10) aryl, hetero (C5-10) aryl, (C9-10) bicycloaryl or hetero (C8-lo) bicycloaryl ; Rl7 is (CI-6) alkyl, (C3-lo) cycloalkyl (Co-6) alkyl, hetero (C3-10) cycloalkyl (Co-3) alkyl, (C6-10)aryl(C0-6)alkyl, hetero (C5-lo) arYl (Co-6) alkyl, (C9-10) bicycloaryl (Co-6) alkyl or hetero (C8-lo) bicycloaryl (Co-6) alkyl, with the proviso that when X3 is cyano, then R17 is (Cl 6) alkyl, (C3-10) cycloalkyl (Cl 6) alkyl, hetero (C3-10)cycloalkyl(C1-6) alkyl, (C6-=10)aryl(C1-6) alkyl, hetero (C5-10) aryl (C1-6)alkyl, (C9-10) bicycloaryl (C1-6) alkyl or hetero (C8-lo) bicycloaryl (CI-6) alkyl; Rl8 is hydrogen, (C1-6) alkyl, (C3-to) cycloalkyl (Co-6) alkyl, hetero (C3-10)cycloalkyl(C0-6) alkyl, (C6-10) aryl (Co-6) alkyl, hetero (C5-lo) aryl (Co-6) alkyl, (C9-10)bicycloaryl(C0-6) alkyl or hetero (C8-10) bicycloaryl (Co-6) alkyl, with the proviso that when X3 is cyano, then Rl8 is (C1-6)alyl, (C3-10)cycloalkyl(C1-6)alkyl, hetero (C3-10)cycloalkyl(C1-6)alyl, (C6-10)aryl(C1-6)alkyl, hetero(C5-10)aryl(C1-6) alkyl, (C9-10)bicycloaryl(C1-6) alkyl or hetero (C8-lo) bicycloaryl (Cl 6) alkyl; and wherein within R3,R4,R15,17 and R'8 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (C1-6) alkyl, (C1-6) alkylidene, cyano, halo, halo-substituted (C1-4) alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12,

-X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5C(O)R13 anD -X5S(O)2R13 and or 1 radical selected from -R14, -X5OR14, -X5SR14, <BR> <BR> <BR> -X5S(O)R14, -X5S(O)2R14, -X5CV(O)R14, -X5CV(O)OR14, -X5OC(O)R14, -X5NR14R12,<BR> l l l -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C*(O)NR14R12 and -X5NR12C(NR12)NR14R12; and within R3 and R4 any aliphatic moiety is unsubstituted or substituted further by 1 to 5 radicals independently selected from cyano, halo, nitro, -NR12R12, -NR12C(O)R12, -NR12C(O)OR12, -NR12C(O)NR12R12, -NR12C(NR12)NR12R12, -OR12, -SR12, -C(O)OR12, -C(O)R12, -OC(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -NR12S(O)2R12, -P(O)(OR12)OR12, -OP(O)(OR12)OR12, -NR12C(O)R13, -S (o) Rl3 and-S (0) 2R13 ; wherein X5, Rl2, Rl3 and Rl4 are as described above, with the proviso that when X3 is cyano and X2 is-OR4, where R4 is defined as-Rl4, or-NHRI8, then any aromatic ring system present within Rl4 or Rl8 is not substituted further by halo, (C3-10) cycloalkyl, hetero (C3-10)cycloalkyl, (C6-10)aryl, hetero (C5 o) aryl, (C9-, o) bicycloaryl or hetero (C8 10) bicycloaryl; with the proviso that only one bicyclic ring structure is present within R3, R4 or R15 ; and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof ; and the pharmaceutically acceptable salts and solvates of such compounds and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof.

A second aspect of the invention is a pharmaceutical composition which contains a compound of Formula I or their N-oxide derivatives, individual isomers or mixture of isomers thereof, or pharmaceutically acceptable salts thereof, in admixture with one or more suitable excipients.

A third aspect of the invention is a method for treating a disease in an animal in which inhibition of cathepsin S can prevent, inhibit or ameliorate the pathology and/or symptomatology of the disease, which method comprises administering to the animal a therapeutically effective amount of compound of Formula I or a N-oxide derivative, individual isomer or mixture of isomers thereof ; or a pharmaceutically acceptable salt thereof.

A fourth aspect of the invention is the processes for preparing compounds of Formula I and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof ; and the pharmaceutically acceptable salts thereof.

DETAILED DESCRIPTION OF THE INVENTION Definitions: Unless otherwise stated, the following terms used in the specification and claims are

defined for the purposes of this Application and have the following meanings.

"Alicyclic"means a moiety characterized by arrangement of the carbon atoms in closed non-aromatic ring structures having properties resembling those of aliphatics and may be saturated or partially unsaturated with two or more double or triple bonds.

"Aliphatic"means a moiety characterized by a straight or branched chain arrangement of the constituent carbon atoms and may be saturated or partially unsaturated with two or more double or triple bonds.

"Alkyl"represented by itself means a straight or branched, saturated or unsaturated, aliphatic radical having the number of carbon atoms indicated (e. g., (C, 6) alkyl includes methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, isobutyl, tert-butyl, vinyl, allyl, 1-propenyl, isopropenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylallyl, ethynyl, 1-propynyl, 2-propynyl, and the like). Alkyl represented along with another radical (e. g., as in arylalkyl) means a straight or branched, saturated or unsaturated aliphatic divalent radical having the number of atoms indicated or when no atoms are indicated means a bond (e. g., (C6, 0) aryl (C0 3) alkyl includes phenyl, benzyl, phenethyl, 1-phenylethyl 3-phenylpropyl, and the like).

"Alkylene", unless indicated otherwise, means a straight or branched, saturated or unsaturated, aliphatic, divalent radical having the number of carbon atoms indicated (e. g., (CI-6) alkylene includes methylene (-CH2-), ethylene (-CH2CH2-), trimethylene (-CH2CH2CH2-), tetramethylene (-CH2CH2CH2CH2-) 2-butenylene (-CH2CH=CHCH2-), 2-methyltetramethylene (-CH2CH (CH3) CH2CH2-), pentamethylene (-CH2CH2CH2CH2CH2-) and the like).

"Alkylidene"means a straight or branched saturated or unsaturated, aliphatic, divalent radical having the number of carbon atoms indicated (e. g. (C, 6) alkylidene includes methylidene (=CH2), ethylidene (=CHCH3), isopropylidene (=C (CH3) 2), propylidene (=CHCH2CH3), allylidene (=CH'CH=CH2), and the like).

"Amino"means the radical-NH2. Unless indicated otherwise, the compounds of the invention containing amino moieties include protected derivatives thereof. Suitable protecting groups for amino moieties include acetyl, tert-butoxycarbonyl, benzyloxycarbonyl, and the like.

"Animal"includes humans, non-human mammals (e. g., dogs, cats, rabbits, cattle, horses, sheep, goats, swine, deer, and the like) and non-mammals (e. g., birds, and the like).

"Aromatic"means a moiety wherein the constituent atoms make up an unsaturated ring system, all atoms in the ring system are Sp hybridized and the total number of pi electrons is equal to 4n+2.

"Aryl"means a monocyclic or fused bicyclic ring assembly containing the total number of ring carbon atoms indicated, wherein each ring is comprised of 6 ring carbon atoms and is aromatic or when fused with a second ring forms an aromatic ring assembly. For example, optionally substituted (C6., 0) aryl as used in this Application includes, but is not limited to, biphenyl-2-yl, 2-bromophenyl, 2-bromocarbonylphenyl, 2-bromo- 5-fluorophenyl, 4-tert-butylphenyl, 4-carbamoylphenyl, 4-carboxy-2-nitrophenyl, 2-chlorophenyl, 4-chlorophenyl, 3-chlorocarbonylphenyl, 4-chlorocarbonylphenyl, 2-chloro-4-fluorophenyl, 2-chloro- 6-fluorophenyl, 4-chloro-2-nitrophenyl, 6-chloro-2-nitrophenyl, 2,6-dibromophenyl, 2,3-dichlorophenyl, 2,5-dichlorophenyl, 3,4-dichlorophenyl, 2-difluoromethoxyphenyl, 3,5-dimethylphenyl, 2-ethoxycarbonylphenyl, 2-fluorophenyl, 2-iodophenyl, 4-isopropylphenyl, 2-methoxyphenyl, 4-methoxyphenyl, 2-methylphenyl,

3-methylphenyl, 4-methylphenyl, 5-methyl-2-nitrophenyl, 4-methylsulfonylphenyl, naphth-2-yl, 2-nitrophenyl, 3-nitrophenyl, 4-nitrophenyl, 2,3,4,5,6-pentafluorophenyl, phenyl, 2-trifluoromethoxyphenyl, 3-trifluoromethoxyphenyl, 4-trifluoromethoxyphenyl, 2-trifluoromethylphenyl, 3-trifluoromethylphenyl, 4-trifluoromethylphenyl, 2-trifluoromethylsulfanylphenyl, 4-trifluoromethylsulfanylphenyl, and the like.

Optionally substituted (C6, 0) aryl as used in this Application includes 3-acetylphenyl, 3-tert-butoxycarbonylaminomethylphenyl, biphenyl-4-yl, 3-hydroxyphenyl, 4-hydroxyphenyl, 3-methoxyphenyl, naphth-2-yl, 3-phenoxyphenyl, phenyl, and the like.

"Bicycloaryl"means a bicyclic ring assembly containing the number of ring carbon atoms indicated, wherein the rings are linked by a single bond or fused and at least one of the rings comprising the assembly is aromatic, and any carbocyclic ketone, thioketone or iminoketone derivative thereof (e. g., (C9.) o) bicycloaryl includes cyclohexylphenyl, 1,2-dihydronaphthyl, 2,4-oxo-1,2,3,4-tetrahydronaphthyl, indanyl, indenyl, 1,2,3,4-tetrahydronaphthyl, and the like).

"Carbamoyl"means the radical-C (O) NH2. Unless indicated otherwise, the compounds of the invention containing carbamoyl moieties include protected derivatives thereof. Suitable protecting groups for carbamoyl moieties include acetyl, tert-butoxycarbonyl, benzyloxycarbonyl, and the like and both the unprotected and protected derivatives fall within the scope of the invention.

"Carbocyclic ketone derivative"means a derivative containing the moiety -C (O)-.

"Carboxy"means the radical-C (O) OH. Unless indicated otherwise, the compounds of the invention containing carboxy moieties include protected derivatives thereof. Suitable protecting groups for carboxy moieties include benzyl, tert-butyl, and the like.

"Cycloalkyl"means a saturated or partially unsaturated, monocyclic, fused bicyclic or bridged polycyclic ring assembly containing the number of ring carbon atoms indicated, and any carbocyclic ketone, thioketone or iminoketone derivative thereof (e. g., (C3 0) cycloalkyl includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, 2,5-cyclohexadienyl, bicyclo [2.2.2] octyl, adamantan-1-yl, decahydronaphthyl, oxocyclohexyl, dioxocyclohexyl, thiocyclohexyl, 2-oxobicyclo [2.2.1] hept-1-yl, and the like).

"Cycloalkylene"means a divalent saturated or partially unsaturated, monocyclic ring or bridged polycyclic ring assembly containing the number of ring carbon atoms indicated, and any carbocyclic ketone, thioketone or iminoketone derivative thereof. For example, the instance wherein"R'and R2 together with the carbon atom to which both R'and R2 are attached form (C3-8) cycloalkylene" includes, but is not limited to, the following: "Disease"specifically includes any unhealthy condition of an animal or part thereof and includes an unhealthy condition that may be caused by, or incident to, medical or

veterinary therapy applied to that animal, i. e., the"side effects"of such therapy.

"Halo"means fluoro, chloro, bromo or iodo.

"Halo-substituted alkyl", as an isolated group or part of a larger group, means"alkyl"substituted by one or more"halo"atoms, as such terms are defined in this Application. Halo-substituted alkyl includes haloalkyl, dihaloalkyl, trihaloalkyl, perhaloalkyl and the like (e. g. halo-substituted (C, 3) alkyl includes chloromethyl, dichloromethyl, difluoromethyl, trifluoromethyl, 2,2,2-trifluoroethyl, perfluoroethyl, 2,2,2-trifluoro- 1,1-dichloroethyl, and the like).

"Heteroatom moiety"includes-N=,-NR-,-O-,-S-or-S (O) 2-, wherein R is hydrogen, (C,. 6) alkyl or a protecting group.

"Heterocycloalkylene"means cycloalkylene, as defined in this Application, provided that one or more of the ring member carbon atoms indicated, is replaced by heteroatom moiety selected from-N=,-NR-,-O-,-S- or-S (O) 2-, wherein R is hydrogen or (C, 6) alkyl. For example, the instance wherein R'and R2 together with the carbon atom to which both R'and R2 are attached form hetero (C3 s) cycloalkyl''includes, but is not limited to, the following: in which R is hydrogen, (C, 6) alkyl, or a protecting group.

"Heteroaryl"means aryl, as defined in this Application, provided that one or more of the ring carbon atoms indicated are replaced by a heteroatom moiety selected from-N=,-NR-,-O-or-S-, wherein R is hydrogen, (C, 6) alkyl, a protecting group or represents the free valence which serves as the point of attachment to a ring nitrogen, and each ring is comprised of 5 or 6 ring atoms. For example, optionally substituted hetero (C5, 0) aryl as used in this Application includes, but is not limited to, 4-amino-2-hydroxypyrimidin-5-yl, benzothiazol-2-yl, lH-benzoimidazol-2-yl, 2-bromopyrid-5-yl, 5-bromopyrid-2-yl, 4-carbamoylthiazol-2-yl, 3-carboxypyrid-4-yl, 5-carboxy-2,6-dimethylpyrid-3-yl, 3,5-dimethylisoxazol-4-yl, 5-ethoxy-2,6-dimethylpyrid-3-yl, 5-fluoro- 6-hydroxypyrimidin-4-yl, fur-2-yl, fur-3-yl, 5-hydroxy-4,6-dimethylpyrid-3-yl, 8-hydroxy- 5,7-dimethylquinolin-2-yl, 5-hydroxymethylisoxazol-3-yl, 3-hydroxy-6-methylpyrid-2-yl, 3-hydroxypyrid-2-yl, 1H-imidazol-2-yl, 1H-imidazol-4-yl, IH-indol-3-yl, isothiazol-4-yl, isoxazol-4-yl, 2-methylfur-3-yl, 5-methylfur-2-yl, 1-methyl-lH-imidazol-2-yl, 5-methyl-3H-imidazol-4-yl, 5-methylisoxazol-3-yl, 5-methyl- 2H-pyrazol-3-yl, 3-methylpyrid-2-yl, 4-methylpyrid-2-yl, 5-methylpyrid-2-yl, 6-methylpyrid-2-yl, 2-methylpyrid-3-yl, 2-methylthiazol-4-yl, 5-nitropyrid-2-yl, 2H-pyrazol-3-yl, 3H-pyrazol-4-yl, pyridazin-3-yl, pyrid-2-yl, pyrid-3-yl, pyrid-4-yl, 5-pyrid-3-yl-2H-[1, 2,4] triazol-3-yl, pyrimidin-4-yl, pyrimidin-5-yl, 1H-pyrrol-3-yl, quinolin-2-yl, IH-tetrazol-5-yl, thiazol-2-yl, thiazol-5-yl, thien-2-yl, thien-3-yl, 2H-[1, 2,4] triazol-3-yl, 3H- [1, 2,3] triazol-4-yl, 5-trifluoromethylpyrid-2-yl, and the like. Suitable protecting groups include tert-butoxycarbonyl, benzyloxycarbonyl, benzyl, 4-methoxybenzyl, 2-nitrobenzyl, and the like.

Optionally substituted hetero (Cs 0) aryl as used in this Application to define R4 includes benzofur-2-yl, fur-2-yl, fur-3-yl, pyrid-3-yl, pyrid-4-yl, quinol-2-yl, quinol-3-yl, thien-2-yl, thien-3-yl, and the like.

"Heterobicycloaryl"means bicycloaryl, as defined in this Application, provided that one or more of the ring carbon atoms indicated are replaced by a heteroatom moiety selected from-N=,-NR-,-O-or-S-, wherein R is hydrogen, (C, 6) alkyl, a protecting group or represents the free valence which serves as the point of attachment to a ring nitrogen, and any carbocyclic ketone, thioketone or iininoketone derivative thereof. For example, optionally substituted hetero (C8. o) bicycloaryl as used in this Application includes, but is not limited to, 2-amino- 4-oxo-3,4-dihydropteridin-6-yl, and the like. In general, the term heterobicycloaryl as used in this Application includes, for example, benzo [1, 3] dioxol-5-yl, 3,4-dihydro-2H- [1,8] naphthyridinyl, 3,4-dihydro-2H-quinolinyl, 2,4-dioxo-3,4-dihydro-2H-quinazolinyl, 1,2,3,4,5,6-hexahydro [2,2'] bipyridinylyl, 3-oxo- 2,3-dihydrobenzo [1, 4] oxazinyl, 5,6,7,8-tetrahydroquinolinyl, and the like.

"Heterocycloalkyl"means cycloalkyl, as defined in this Application, provided that one or more of the ring carbon atoms indicated are replaced by a heteroatom moiety selected from-N=,-NR-,-O-or-S-, wherein R is hydrogen, (C, 6) alkyl, a protecting group or represents the free valence which serves as the point of attachment to a ring nitrogen, and any carbocyclic ketone, thioketone or iminoketone derivative thereof (e. g., the term hetero (Cs, 0) cycloalkyl includes imidazolidinyl, morpholinyl, piperazinyl, piperidyl, pyrrolidinyl, pyrrolinyl, quinuclidinyl, and the like). Suitable protecting groups include tert-butoxycarbonyl, benzyloxycarbonyl, benzyl, 4-methoxybenzyl, 2-nitrobenzyl, and the like. Both the unprotected and protected derivatives fall within the scope of the invention.

"Heteromonocyclic ring"means a saturated or partially unsaturated, monocyclic ring assembly containing the number of ring carbon atoms indicated, as defined in this Application, provided that one or more of the ring carbon atoms indicated are replaced by one or more heteroatoms selected from-N=,-NY3-,-O-or - S-, wherein Y3 is hydrogen, alkyl, aryl, arylalkyl,-C (=O)-R,-C (=O)-OR or-SO2R.

"Heterobicyclic ring"means a saturated or partially unsaturated fused bicyclic or bridged polycyclic ring assembly containing the number of ring carbon atoms indicated, as defined in this Application, provided that one or more of the ring carbon atoms indicated are replaced by one or more heteroatoms selected from-N=, -NY3-,-O-or-S-, wherein Y3 is hydrogen, alkyl, aryl, arylalkyl,-C (=O)-R,-C (=O)-OR or-SO2R.

"Hydroxy"means the radical-OH. Unless indicated otherwise, the compounds of the invention containing hydroxy radicals include protected derivatives thereof. Suitable protecting groups for hydroxy moieties include benzyl and the like.

"Iminoketone derivative"means a derivative containing the moiety-C (NR)-, wherein R is hydrogen or (C, 6) alkyl.

"Isomers"mean compounds of Formula I having identical molecular formulae but differ in the nature or sequence of bonding of their atoms or in the arrangement of their atoms in space. Isomers that differ in the arrangement of their atoms in space are termed"stereoisomers". Stereoisomers that are not mirror images of one another are termed"diastereomers"and stereoisomers that are nonsuperimposable mirror images are termed "enantiomers"or sometimes"optical isomers". A carbon atom bonded to four nonidentical substituents is termed a"chiral center". A compound with one chiral center has two enantiomeric forms of opposite chirality is termed a"racemic mixture". A compound that has more than one chiral center has 2"-'enantiomeric pairs, where n is the number of chiral centers. Compounds with more than one chiral center may exist as ether an individual

diastereomers or as a mixture of diastereomers, termed a"diastereomeric mixture". When one chiral center is present a stereoisomer may be characterized by the absolute configuration of that chiral center. Absolute configuration refers to the arrangement in space of the substituents attached to the chiral center. Enantiomers are characterized by the absolute configuration of their chiral centers and described by the R-and S-sequencing rules of Cahn, Ingold and Prelog. Conventions for stereochemical nomenclature, methods for the determination of stereochemistry and the separation of stereoisomers are well known in the art (e. g., see"Advanced Organic Chemistry", 4th edition, March, Jerry, John Wiley & Sons, New York, 1992). It is understood that the names and illustration used in this Application to describe compounds of Formula I are meant to be encompassed all possible stereoisomers. Thus, for example, the name N-[l-(l-benzothiazol-2-yl-methanoyl)-propyl]-2-hydroxy- 3-phenylmethanesulfonyl-propionamide is meant to include (S)-N [1- (1-benzothiazol-2-yl-methanoyl)-propyl]-2- <BR> <BR> <BR> hydroxy-3-phenylmethanesulfonyl-propionamide, (R)-N- [I- (l-benzothiazol-2-yl-methanoyl)-propyl]-2-hydroxy- 3-phenylmethanesulfonyl-propionamide, (R)-N- [(S)-I-(I-benzothiazol-2-yl-methanoyl)-propyl]-2-hydroxy-3- phenylmethanesulfonyl-propionamide, (S)-N- [ (R)-l- (l-benzothiazol-2-yl-methanoyl)-propyl]-2-hydroxy-3- <BR> <BR> <BR> phenylmethanesulfonyl-propionamide, (R)-N- [ (R)-1- (1-benzothiazol-2-yl-methanoyl)-propyl]-2-hydroxy-3- phenylmethanesulfonyl-propionamide, N- [ (S)-1- (1-benzothiazol-2-yl-methanoyl)-propyl]-2-hydroxy-3- phenylmethanesulfonyl-propionamide, N- [(R)-I-(I-benzothiazol-2-yl-methanoyl)-propyl]-2-hydroxy-3- phenylmethanesulfonyl-propionamide, (S)-N- [ (S)-I-(I-benzothiazol-2-yl-methanoyl)-propyl]-2-hydro xy-3- phenylmethanesulfonyl-propionamide and any mixture, racemic or otherwise, thereof.

"Ketone derivative"means a derivative containing the moiety-C (O)-. For example, in this Application X3 can be 2-acetoxy-azetidin-3-yl. The"carbocyclic ketone derivative"of this example of X3 would be 2-acetoxy-4-oxo-azetidin-3-yl (see Table 3, C32).

"Nitro"means the radical-NO2.

"Optional"or"optionally"means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event or circumstance occurs and instances in which it does not. For example, the phrase"wherein within R3 and R4 any alicyclic or aromatic ring system may be substituted further by 1-5 radicals..."means that R3 and R4 may or may not be substituted in order to fall within the scope of the invention.

"Oxoalkyl"means alkyl, as defined above, wherein one of the number of carbon atoms indicated is replaced by an oxygen group (-O-), e. g., oxo (C2 6) alkyl includes methoxymethyl, etc.

"N-oxide derivatives"means derivatives of compounds of Formula I in which nitrogens are in an oxidized state (i. e., O-N) and which possess the desired pharmacological activity.

"Pathology"of a disease means the essential nature, causes and development of the disease as well as the structural and functional changes that result from the disease processes.

"Pharmaceutically acceptable"means that which is useful in preparing a pharmaceutical composition that is generally safe, non-toxic and neither biologically nor otherwise undesirable and includes that which is acceptable for veterinary use as well as human pharmaceutical use.

"Pharmaceutically acceptable salts"means salts of compounds of Formula I which are pharmaceutically acceptable, as defined above, and which possess the desired pharmacological activity. Such salts include acid addition salts formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like ; or with organic acids such as acetic acid, propionic acid, hexanoic acid, heptanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartatic acid, citric acid, benzoic acid, o- (4-hydroxybenzoyl) benzoic acid, cinnamic acid, madelic acid, methanesulfonic acid, ethanesulfonic acid, 1,2-ethanedisulfonic acid, 2-hydroxyethanesulfonic acid, benzenesulfonic acid, p-chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, p-toluenesulfonic acid, camphorsulfonic acid, 4-methylbicyclo [2.2.2] oct-2-ene-1-carboxylic acid, glucoheptonic acid, 4,4'-methylenebis (3-hydroxy-2-ene-1-carboxylic acid), 3-phenylpropionic acid, trimethylacetic acid, tertiary butylacetic acid, lauryl sulfuric acid, gluconic acid, glutamic acid, hydroxynaphthoic acid, salicylic acid, stearic acid, muconic acid and the like.

Pharmaceutically acceptable salts also include base addition salts which may be formed when acidic protons present are capable of reacting with inorganic or organic bases. Acceptable inorganic bases include sodium hydroxide, sodium carbonate, potassium hydroxide, aluminum hydroxide and calcium hydroxide.

Acceptable organic bases include ethanolamine, diethanolamine, triethanolamine, tromethamine, N-methylglucamine and the like.

"Prodrug"means a compound which is convertible in vivo by metabolic means (e. g. by hydrolysis) to a compound of Formula 1. For example an ester of a compound of Formula I containing a hydroxy group may be convertible by hydrolysis in vivo to the parent molecule. Alternatively an ester of a compound of Formula I containing a carboxy group may be convertible by hydrolysis in vivo to the parent molecule. Suitable esters of compounds of Formula I containing a hydroxy group, are for example acetates, citrates, lactates, tartrates, malonates, oxalates, salicylates, propionates, succinates, fumarates, maleates, methylene- bis-b-hydroxynaphthoates, gentisates, isethionates, di-p-toluoyltartrates, methanesulphonates, ethanesulphonates, benzenesulphonates, p-toluenesulphonates, cyclohexylsulphamates and quinates. Suitable esters of compounds of Formula I containing a carboxy group, are for example those described by F. J. Leinweber, Drug Metab. Res., 1987,18, page 379. An especially useful class of esters of compounds of Formula I containing a hydroxy group, may be formed from acid moieties selected from those described by Bundgaard et al., J. Med. Chem., 1989,32, page 2503-2507, and include substituted (aminomethyl)-benzoates, for example, dialkylamino-methylbenzoates in which the two alkyl groups may be joined together and/or interrupted by an oxygen atom or by an optionally substituted nitrogen atom, e. g. an alkylated nitrogen atom, more especially (morpholino-methyl) benzoates, e. g.

3-or 4- (morpholinomethyl)-benzoates, and (4-alkylpiperazin-1-yl) benzoates, e. g. 3-or 4- (4-alkylpiperazin-1-yl) benzoates.

"Protected derivatives"means derivatives of compounds of Formula I in which a reactive site or sites are blocked with protecting groups. Protected derivatives of compounds of Formula I are useful in the preparation of compounds of Formula I or in themselves may be active cathepsin S inhibitors. A comprehensive list of suitable protecting groups can be found in T. W. Greene, Protecting Groups in Organic Synthesis, 3rd edition, John Wiley & Sons, Inc. 1999.

"Therapeutically effective amount"means that amount which, when administered to an animal for treating a disease, is sufficient to effect such treatment for the disease.

"Thioketone derivative"means a derivative containing the moiety-C (S)-.

"Treatment"or"treating"means any administration of a compound of the present invention and includes: (1) preventing the disease from occurring in an animal which may be predisposed to the disease but does not yet experience or display the pathology or symptomatology of the disease, (2) inhibiting the disease in an animal that is experiencing or displaying the pathology or symptomatology of the diseased (i. e., arresting further development of the pathology and/or symptomatology), or (3) ameliorating the disease in an animal that is experiencing or displaying the pathology or symptomatology of the diseased (i. e., reversing the pathology and/or symptomatology).

Nomenclature: The compounds of Formula I and the intermediates and starting materials used in their preparation are named in accordance with IUPAC rules of nomenclature in which the characteristic groups have decreasing priority for citation as the principle group as follows: acids, esters, amides, etc. Alternatively, the compounds are named by AutoNom 4.0 (Beilstein Information Systems, Inc.). For example, a compound of Formula I wherein X2 is hydroxy, R3 is phenylmethanesulfonylmethyl and Xl is-NHC (Rt) (R2) X3 (in which R'is hydrogen, R2 is ethyl and X3 is 1-benzothiazol-2-yl-methanoyl) ; that is, a compound having the following structure: is named (R)-N-[(S)-I-(I-benzothiazol-2-yl-methanoyl)-propyl]-2-hydro xy-3-phenylmethanesulfonyl- propionamide; Presently Preferred Embodiments: While the scope of the invention is set forth in the Summary of the Invention, certain aspects of the invention are preferred. For example, preferred is a compound of Formula I : in which: X'is-NHC (Ri) (R2) X3 or-NHCH (RI9) C (O) R20 ;

X2 is hydrogen, fluoro, -OH, -OR4, -NHR15 or -NR17R18 and X7 is hydrogen or X2 and X7 both represent fluoro; X3 is cyano -C(R7)(R8)R16, -C(R6)(OR6)2, -CH2C(O)R16, -CH=CH2(O)2R5, -C(O)CF2C(O)NR5R5, -C(O) C (O) NR5R6, -C(O)C(O)OR5, -C(O)CH2OR5, - C (O) CH2N (R6) SO2RS or-C (O) C (O) R5 ; wherein R 5 is hydrogen, (C1-4)alkyl, (C3-10) cycloalkyl (Co-6) alkyl, hetero (C3-10) cycloalkyl (C0-3) alkyl, (C6-10)aryl(C0-6) alkyl, hetero (C5-10) aryl (C0-6) alkyl, (C9-10) bicycloaryl (C0-6) alkyl or hetero (C8-10)bicycloaryl(C0-6) alkyl; R6 is hydrogen, hydroxy or (Ci-6) alkyl; or where X3 contains an-NR5R6 group, R and R6 together with the nitrogen atom to which they are both attached, form hetero (C3-10)cycloalkyl, hetero (C5-lo) aryl or hetero (C8 l0) bicycloaryl ; R7 is hydrogen or (C1-4)alkyl and R is hydroxy or R7 and R8 together form oxo; Rl6 is hydrogen,- X4,-CF3,-CF2CF2R9 or-N (R6)OR6; R9 is hydrogen, halo, (C1-4)alkyl, (C5-10)aryl(C0-6) alkyl or (C5-10) heteroaryl (C0-6) alkyl, with the proviso that when X3 is cyano, then X2 is hydrogen, fluoro,-OH,-OR4 or -NR17R18 and X7 is hydrogen or X2 and X7 both represent fluoro; X4 comprises a heteromonocyclic ring containing 4 to 7 ring member atoms or a fused heterobicyclic ring system containing 8 to 14 ring member atoms and any carbocyclic ketone, iminoketone or thioketone derivative thereof, with the proviso that when-X4 is other than a heteromonocyclic ring containing 5 ring member atoms, wherein no more than two of the ring member atoms comprising the ring are heteroatoms, then X2 is fluoro, -OH, -OR4, -NHR15 or -NR17R18 and X7 is hydrogen or X2 and X7 both represent fluoro; wherein within R5, X3 or X4 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (Ci-6) alkyl, (C1-6)alkylidene, cyano, halo, halo-substituted (C1-4) alkyl, nitro, -X5NR12R12,-X5NR12C(O)R12, <BR> <BR> <BR> <BR> <BR> <BR> <BR> -X5NR12C(O)OR¹, -X5NR¹²C(O)NBR¹²R¹²,-X5NR¹²C(NR12)NR12R12, -X5OR12, -X5SR12,<BR> -X5C(O)OR12, -X5CV(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13 and -X5S(O)2R13 and/or 1 radical selected from -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wherein X5 is a bond or (C1-6)alkylene; R12 at each occurrence independently is hydrogen, (C1-6) alkyl or halo-substituted (C, 6) alkyl; R13 is (C1-6) alkyl or halo-substituted (C1-6) alkyl; and Rl4 is (C3-10)cycloalkyl(C0-6) alkyl, hetero (C3-10cycloalkyl(C0-3) alkyl, (C6-10) aryl (C0-6)alkyl, hetero (C5-1o) aryl (C0-6) alkyl,

(C9-10)bicycloaryl(C0-6)alkyl or hetero(C8-10)bicycloaryl(C0-6)alkyl; R1 is hydrogen or (C1-6)alkyl and R2 is selected from a group consisting of hydrogen, cyano, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -R12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5N12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)oR12, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13, -R14, -X5OR14, -X5SR14, -5S(O)R14 -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R1, -X5NR14R12, -X5NR14C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wherenin X5,R12,13 and R14 are as defined above; or R1 and R2 taken together with the carbon atom to which both r1 and R2 are attached form (C3-8)cycloalkylene or (C3-8)heterocycloalkylene; wheren within said R2 any heteroaryl, aryl, cycloalkyl, heterocycloalkyl, cycloalkylene or heterocycloalkylene is unsubstituted or substituted with 1 to 3 radicals independently selected from (C1-6)alkyl, (C1-6)alkyllidence, cyano, halo, halo-substituted(C1-4)alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR2R12, -X5OR12, -XSR12, <BR> <BR> <BR> -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12,<BR> -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13, and -X5C(O)R13, wherein X5,R12 and R13 are as defined above; R3 is (C1-6)alkyl or -C(R6)(R6)X6, wherein R6 is hydrogen or (C1-6)alkyl and X6 is selected from -X5NR12R12, -X5NR12C(O)R12, -XNR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, <BR> <BR> <BR> -X5OP(O)(OR12)OR12,-X5C(O)R13, -X5NR12R13, -X5S(O)R13, -X5S(O)2R13, - R14,<BR> <BR> <BR> <BR> <BR> -X5OR14, -X5R14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14,-X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -X5NR12S(O)R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12 wherein X5,R12,R13, and R14 are as defined above; R4 is selected from -X5NR12R12, -X8NR12C(O)R12, -X8NR12C(O)OR12, <BR> <BR> <BR> <BR> <BR> <BR> -X5NR12C(O)NR12R12, -X5NR12C(NR12)NFR12R12, -X8OR12, -X8SR12 -X5C(O)OR12,<BR> -X5C(O)R12, -X8OC(O)R12, -X5C(O)NR12R12, -X8S(O)2NR12R12, -X8NR12S(O)2R12, -X8P(O)(OR12)OR12,-X8OP(O)(OR12)OR12,-X5C(O)R13, -XNR12C(O)R13, -X8S(O)R13, -X8S(O)2R13, -R14, -X8OR14, -X8SR14, -X8S(O)R14, -X8S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X8OC(O)R14, -8NR14R12, -X8NR12C(O)R14, -X8NR12C(O)OR14, -X5C(O)NR14R12,

-X8S(O)2NR14R12, -X8NR12S(O)2R14, -X8NR12C(O)NR14R12 and -X8NR12C(NR12)NR1R12 wherein x8 is (C1-6)alkylene and X5, R12,R13 and R14 are as defined above, with the proviso that when X3 is cyano and X2 is-OR4, where R4 is defined as-Rl4, then Rl4 is (C3-10) cycloalkyl (Cl 6) alkyl, hetero (C3-10) cycloalkyl (Cl 3) alkyl, (C6-10)aryl(C1-6) alkyl, hetero (C5-10) aryl (C1-6)alkyl, (C9-10) bicycloaryl (C1-6) alkyl or hetero (C8-lo) bicycloaryl (C1-6) alkyl; R5 is (C6-10) aryl, hetero (C5-lo) aryl, (C9-10) bicycloaryl or hetero (C8-10)bicycloaryl ; Rl7 is (Ci-6) alkyl, (C3-10) cycloalkyl (Co-6) alkyl, hetero (C3-10)cycloalkyl(C3-10) alkyl, (C6-10)aryl(C0-6) alkyl, hetero (C5-10) aryl (C0-6) alkyl, (C9-10)bicycloaryl(C0-6) alkyl or hetero (C8-lo) bicycloaryl (Co-6) alkyl, with the proviso that when X3 is cyano, then R17 is (CI-6) alkyl, (C3-10)cycloalkyl(C1-6) alkyl, hetero (C3-10) cycloalkyl (CI-6) alkyl, (C6-10)aryl(C1-6) alkyl, hetero (C5-10)aryl(C1-6) alkyl, (C9-10)bicycloaryl(C1-6) alkyl or hetero (C8-10) bicycloaryl (C1-6) alkyl; Rl8 is hydrogen, alkyl, (C3-10) cycloalkyl (C0-6) alkyl, hetero (C3-10)cycloalkyl(C0-6)alkyl, (C6-10)aryl(C0-6)alkyl, hetero (C5-10)aryl(C0-6) alkyl, (C9-10)bicycloaryl(C0-6) alkyl or hetero (C8-lo) bicycloaryl (Co-6) alkyl, with the proviso that when X3 is cyano, then R18 is (C1-6) alkyl, (C3-10)cycloalkyl(C1-6) alkyl, hetero (C3-) o) cycloalkyl (C1-6)substituted, (C6-10)aryl(C1-6) alkyl, hetero (C5-) o) aryl (C1-6) alkyl, (C9-lo) bicycloaryl (Ci-6) alkyl or hetero (C8-10) bicycloaryl (Cl 6) alkyl; and R19 and R20 together with the atoms to which R'9 and R20 are attached form (C4-8) heterocycloalkylene, wherein no more than one of the ring member atoms comprising the ring is a heteroatom selected from-NR21-or-O-, wherein the ring is unsubstituted or substituted with R2, wherein R2 is as defined above, and R2'is hydrogen,-C (O) OR12, -C(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -S(O)R13 and -S(O02R13, -S(O)R14, -S(O)2R14, -C(O)R14, -C(O)OR14, -C(O)NR12R12 and -S(O)2NR14R12, wherein R2,R13 and R14 are as defined above; wherein within R3, R4, R15, R17 and R18any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (C1-6) alkyl, (Cl-6) alkylidene, cyano, halo, halo-substituted (C1-4) alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR2R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12 , -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR2)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5C(O)R13 and -X5S(O)R13 and/or 1 radical selected from -R14, -X5OR14, -X5SR14,

-X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12; and within R3 and R4 any aliphatic moiety is unsubstituted or substituted further by 1 to 5 radicals independently selected from cyano, halo, nitro, -NR12R12, -NR12C(O)R12, -NR12C(O)OR12, -NR12C(O)NR12R12, -NR12C(NR12)NR12R12, -OR12, -SR12, -C(O)OR12, -C(O)R12, -OC(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -NR12S(O)2R12, -P(O)(OR12)OR12, -OP(O)(OR12)OR12, -NR12C(O)R13, -S(O)R13 and-S (0) 2R 13 ; wherein X5, R12, R'3 and R14 are as described above, with the proviso that when X3 is cyano and X2 is-OR4, where R4 is defined as -R14, or -NHR18, then any aromatic ring system present within R14 or Rl8 is not substituted further by halo, (C3-10)cycloalkyl, hetero (C3-100cycloalkyl, (C6-10)aryl, hetero (C5 O) aryl, (C9-10) bicycloaryl or hetero (C8-10) bicycloaryl; with the proviso that only one bicyclic ring structure is present within R3, R4 or Rl5 ; and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof; and the pharmaceutically acceptable salts and solvates of such compounds and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof.

Preferred is a compound of Formula I : in which: X1 is -NHC(R1)(2)X3 or -NHCH(R19) C (O) R'O ; X2 is hydrogen, fluoro, -OH, -OR4, -NNR15 or -NR17R18 and X7 is hydrogen or X2 and X7 both represent fluoro; X3 is -C(R7)(R8)R16, -C(R6)(OR6)2, -CH2C(O)R16, -CH=CHS(O)2R5, -C(O)CF2C(O)NR5R5, -C(O) C (O) NRSR6,-C (O) C (O) OR5,-C (O) CH20R5, -C(O)CH2N(R6)SO2R5 or-C (O) C (O) R5 ; wherein R5 is hydrogen, (C1-4)alkyl, (C3-10)cycloalkyl(C0-6)alkyl, hetero (C3-10)cycloalkyl(C0-3)alkyl, (C6-10)aryl(C0-6) alkyl, hetero (C5-10)aryl(C0-6) alkyl, (C9-10)bicycloaryl(C0-6)alkyl or hetero (C8-10)bicycloaryl(C0-6) alkyl; R6 is hydrogen, hydroxy or (Cl 6) alkyl ; or where X3

cotnains an -NR5R6 group, R5 and R6 together with the nitrogen atom to which they are both attached, form hetero(C3-10)cycloalkyl, hetero(C5-10)aryl or hetero(C8-10)bicycloaryl; R7 is hydrogen or (C1-4)alkyl and R8 is hydroxy or R7 an dR8 together form oxo; R16 is hydrogen, - X4, -CF3, -CF2CF2R9 or -N(R6)OR6; R9 is hydrogen, halo, (C1-4)alkyl, (C-10)aryl(C0-6)alkyl or (C5-10)heteroaryl(C0-6)alkyl; X4 comprises a heteromonocyclic ring containing 4 to 7 ring member atoms or a fused heterobicyclic ring system containing 8 to 14 ring member atoms and any carbocyclic ketone, iminoketone or thiketone derivative thereof, with the provisio that when -X4 is other than a heteromonocyclic ring containing 5 ring member atoms, wherein no more th an two of the ring member atoms comprising the ring the heteroatoms, then X2 is fluoro, -OH, -OR4, -NHR15 or -NR17R18 and X7 is hyrogen or X2 and X7 both represent fluoro; wherein within R5,X3 or X any alicyclic or aroamtic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (C1-6)alkyl, (C1-6)alkyliden, cyano, halo, halo-substituted(C1-4)alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, and -X5S(O)2R13 and/or 1 radical selected from -R14, -X5OR14 -X5SR14, -X5S(O)14, -X5S(O)2R14 -X5C(O)R14, -X5C(O)OR14, -X5C(O)R14, -X5NR1R2, -X5NR12C(O)R14, <BR> <BR> <BR> -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14,<BR> -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wheein X5 is a bond or (C1-6)alkylene; R12 at each occurrence i ndependently is hydrogen, (C1-6)alkyl or halo-substituted(C1-6)alkyl; R13 is (C1-6)alkyl or halo-substituted(C1-6)alkyl; and R14 is (C3-10)cycloalkyl(C0-6)alkyl, hetero(C3-100cycloalkyl(C0-3)alkyl, (C6-10)aryl(C0-6)alkyl, hetero(C5-10)ryl(C0-6)alkyl, (C9-10)bicycloaryl(C0-6)alkyl or hetero(C8-10)bicyclo(C0-6)alkyl; R1 is hydrogen or (C1-6)alkyl and R2 is selected from a group consisting of hydrogen, cyano, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -XR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -XSR12, -X5C(O)OR12, -X5C(O)OR12, - X5OC(O)R12, -5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12SO)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12 -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13, -X14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR1R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR17S(O)2R14, -X5NR12C(O)NR12R12 and -X5NR12C(NR12)NR14R12, wherein X5,R12,R13 and R14 are as

defined above; or R1 and R2 taken together with the carbon atom to which both Rl and R2 are attached form (C3_8) cycloalkylene or (C3-g) heterocycloalkylene; wherein within said R any heteroaryl, aryl, cycloalkyl, heterocycloalkyl, cycloalkylene or heterocycloalkylene is unsubstituted or substituted with 1 to 3 radicals independently selected from (Cl 6) alkyl, (C1-6)alkylidene, cyano, halo, halo-substituted (C1-4) alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR2R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12 -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13 and -X5C(O)R13, wherein X5,R12 and R13 are as defined above; R3 is-C (R6) (R6) X6, wherein R6 is hydrogen or (Cl 6) alkyl and X6 is selected from -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12 ,-X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5C(O)R13, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O02R13, -R1, -X5OR14, -X5SR14,-X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14,-X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12 wherein X5,R12,R13 and R14 are as defined above; R4 is seelected from -X8NR12R12, -X8NR12C(O)R12, -X8NR12C(O)OR12, <BR> <BR> <BR> <BR> and R''* are as defined above ;<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> -X5C(O)R12, -X8OC(O)R12, -XC(O)NR12R12, -X8S(O)2NR12R12, -X8NR12S(O)2R12, X8P(O)(OR12)OR12, -X8OP(O)(OR12)OR12, -X5C(O)R13, -X8NR12C(O)R13, -X8S(O)R3, X8S(O)2R1, -R14, -X8OR14 -X8SR14, -X8S(O)R14,-X8S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X8OC(O)R14, -X8NR14R12, -X8NR12C(O)R14, -X8NR12C(O)OR14, -X5C(O)NR14R12, -X8S(O)2NR14R12, -X8NR12SO)2R14, -X8NR12C(O)NR14R12 and -X8NR12C(NR12)NR14R12 wherein X8 is (C1-6)alkylene and X5,R12,R13 and R14 are as defined above; * 15 is (C6-10) aryl, hetero (C5-10) aryl, (C9-10) bicycloaryl or hetero(C8-10) bicycloaryl; Riz is hydrogen, (C1-6)alkyl, (C3-10)cycoalkyl(C0-6) alkyl, hetero (C3-10)cycloalkyl(C0-3) alkyl, (C6-1o) aryl (Co-6) alkyl, hetero (C5-10)aryl(C0-6) alkyl, (C9-10)bicycloaryl(C0-6)alkyl or hetero(C8-10) bicycloaryl (Co-6) alkyl; Rl8 is (CI-6) alkyl, (C3, o) cycloalkyl (Co-6) alkyl, hetero (C3-100cycloalkyl(C0-6) alkyl, (C6-lo) aryl (Co-6) alkyl, hetero (C5-10) aryl (Co-6) alkyl, (C9-10)bicycloaryl(C0-6) alkyl or hetero (C8-lo) bicycloaryl (Co-6) alkyl; and

Rl9 and R20 together with the atoms to which Rl9 and R20 are attached form (C4-8) heterocycloalkylene, wherein no more than one of the ring member atoms comprising the ring is a heteroatom selected from-NR21-or-O-, wherein the ring is unsubstituted or substituted with Rl, wherein R'is as defined above, and R21 is hydrogen,-C (O) OR, <BR> <BR> <BR> <BR> <BR> <BR> <BR> -C(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -S(O)R13 and -S(O)2R13, -S(O)R14, -S(O)2R14,<BR> -C(O)R14, -C(O)OR14, -C(O)NR12R12 and -S(O)2NR14R12, wherein R12, R13 and R14 are as defined above; wherein within R3, R4, R, R and R'8 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (Cl 6) alkyl, (Ci-6) alkylidene, cyano, halo, halo-substituted (Ci-4) alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5C(O)R13 and -X5S(O)2R13 and/or 1 radical selected from -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12; and within R3 and R4 any aliphatic moiety is unsubstituted or substituted further by 1 to 5 radicals independently selected from cyano, halo, nitro, -NR12R12, -NR12C(O)R12, -NR12C(O)OR12, -NR12C(O)NR12R12, -NR12C(NR12)NR12R12, -OR12, -SR12, -C(O)OR12, -C(O)R12, -OC(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -NR2S(O)2R12, -P(O)(OR12)OR12, -OP(O)(OR12)OR12, -NR12C(O)R13, - S (O) R13 and-S (0) 2RI3 ; wherein X5, Rl2, Rl3 and Rl4 are as described above; with the proviso that only one bicyclic ring structure is present within R3, R4 or R'5 ; and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof ; and the pharmaceutically acceptable salts and solvates of such compounds and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof.

Preferred is a compound of Formula I :

in which: X1 is -NHC(R1)(R2)X3 or -NHCH(R19)C(O)R20; X2 is hydrogen, fluoro, -OH, -OR4 or -NR17R18 and X7 is hydrogen or X2 and X7 both represent fluoro; X3 is cyano; wherein within X3 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (C1-6)alkyl, (C1-6)alkylidene, cyano, halo, halo-substituted(C1-4)alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13 and -X5S(O)2R13 and/or 1 radical selected from -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wherein X5 is a bond or (C1-6) alkylene; R12 at each occurrence independently is hydrogen, (C1-6)alkyl or halo-substituted(C1-6)alkyl;R13 is (C1-6)alkyl or halo-substituted(C1-6)alkyl; and R14 is (C3-10)cycloalkyl(C0-6)alkyl, hetero(C3-10)cycloalkyl(C0-3)alkyl, (C6-10)aryl(C0-6)alkyl, hetero(C5-10)aryl(C0-6)alkyl, (C9-10)bicycloaryl(C0-6)alkyl or hetero(C8-10)bicycloaryl(C0-6)alkyl; R1 is hydrogen or (C1-6)alkyl and R2 is selected from a group consisting of hydrogen, cyano, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5R12, -X5NR12C(O)NR12R12, <BR> <BR> <BR> -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12,-X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12,<BR> -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13, -R12, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wherein X5, R12, R13 and R14 are as defined above; or R1 and R2 taken together with the carbon atom to which both R1 and R2 are

attached form (C3-8) cycloalkylene or (C3 s) heterocycloalkylene ; wherein within said R2 any heteroaryl, aryl, cycloalkyl, heterocycloalkyl, cycloalkylene or heterocycloalkylene is unsubstituted or substituted with 1 to 3 radicals independently selected from (CI-6) alkyl, (C1-6) alkylidene, cyano, halo, halo-substituted (C1-4) alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5CO)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13 and -X5C(O)R13, wherein X5, R12 and R13 are as defined above; R3 is-C (R6) (R6) X6, wherein R6 is hydrogen or (C1-6)alkyl and X6 is selected from -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, <BR> <BR> <BR> <BR> -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12,<BR> -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)OR12)OR12, -X5C(O)R13, -X5NR12C(O0R13, -X5S(O)R13, -X5S(O)2R13, -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12 wherein X5, R12, R13 and R14 are as defiend above; R4 is selected from -X8NR12R12, -X8NR12C(O)R12. -X8NR12C(O)OR12, -X8NR12C(O)NR12R12, -X8NR12C(NR12)NR12R12, -X8OR12, -X8SR12, -X5C(O)OR12, -X5C(O)R12, -X8OC(O)R12, -X5C(O)NR12R12, -X8S(O)2NR12R12, -X8NR12S(O)2R12, -X8P(O)(OR12)OR12, -X8OP(O)(OR12)OR12, -X5C(O)R13, -X8NR12C(O)R13, -X8S(O)R13, -X8S(O)2R13, -R14, -X8OR14, -X8SR14, -X8S(O)R14, -X8S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X8OC(O)R14, -X8NR14R12, -X8NR12C(O)R14, -X8NR12C(O)OR14, -X5C(O)NR14R12, -X8S(O)2NR14R12, -X8NR12S(O)2R14, -X8NR12C(O)NR14R12 and -X8NR12C(NR12)NR14R12 wherein X8 is (C1-6)alkylene and X5, R12, R13 and R14 are as defined above, with the proviso that when X3 is cyano and X2 is-OR4, where R4 is defined as-Rl4, then Rl4 is (C3-10) cycloalkyl (CI-6) alkyl, hetero (C3-io) cycloalkyl (CI 3) alkyl, (C6-10)aryl(C1-6)alkyl, hetero (C5-10) aryl (Cl 6) alkyl, (C9-10) bicycloaryl (Cl 6) alkyl or hetero (C8, o) bicycloaryl (C, 6) alkyl; Rl5 is (C6-lo) aryl, hetero (C5-10) aryl, (Cg-lo) bicycloaryl or hetero (C8-10) bicycloaryl; R17is (C1-6) alkyl, (C3-10)cycloalkyl(C1-6) alkyl, hetero (C3-1o) cycloalkyl (C1-6) alkyl, (C6-10)aryl(C1-6)alkyl, hetero (C5-lo) aryl (C1-6)alkyl, (C9-10) bicycloaryl (Cl 6) alkyl or hetero (C8 1O) bicycloaryl (CI 6) alkyl;

Ri8 is (Cl 6) alkyl, (C3-10)cycloalkyl(C1-6) alkyl, hetero (C3-10)cycloalkyl(C1-6)alkyl, (C6-10)aryl(C1-6) alkyl, hetero (C5-10)aryl(C1-6) alkyl, (C9-10)bicycloaryl(C1-6) alkyl or hetero (C8-10) bicycloaryl (Cl 6) alkyl; and Rl9 and R20 together with the atoms to which R'9 and R20 are attached form (C4-8) heterocycloalkylene, wherein no more than one of the ring member atoms comprising the ring is a heteroatom selected from-NR21-or-O-, wherein the ring is unsubstituted or substituted with R', wherein R'is as defined above, and R is hydrogen,-C (O) OR, -C(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -S(O)R13 and -S(O)2R13, -S(O)R14, -S(O2)R14, -C(O)R14, -C(O)OR14, -C(O)NR12R12 and -S(O)2NR14R12, wherein R12, R13 and R14 are as defined above; wherein within R3, R4, R15, R17 and R18 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (C1-6) alkyl, (Ci-6) alkylidene, cyano, halo, halo-substituted (Cl4) alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR1C(NR12)NR12R12, -X5OR1,2 -X5SR12, -X5C(O0OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5C(O)R13 and -X5S(O)2R13 and/or 1 radical selected from -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12; and within R3 and R4 any aliphatic moiety is unsubstituted or substituted further by 1 to 5 radicals independently selected from cyano, halo, nitro, -NR12R12, -NR12C(O)R12, -NR12C(O)OR12, -NR12C(O)NR12R12, -NR12C(NR12)NR12R12, -OR12, -SO12, -C(O)OR12, -C(O)R12, -OC(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -NR12S(O)2R12, -P(O)(OR12)OR12, -OP(O)(OR)12)OR12, -NR12C(O)R13, -S(O)R13 and -S(O)2R13; wherein X5, R12, R13 and R14 are as described above, with the proviso that when X2 is-OR4, where R4 is defined as-Rl4, or-NHRl8, then any aromatic ring system present within RI4 or Rl8 is not substituted further by halo, (C3-10) cycloalkyl, hetero (C3-) o) cycloalkyl, (C6-io) aryl, hetero (C5 l0) aryl, (C9-10) bicycloaryl or hetero (C8 10) bicycloaryl ; with the proviso that only one bicyclic ring structure is present within R3, R4 or Rl5 ; and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof ; and the pharmaceutically acceptable salts and solvates of such compounds and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof.

Preferred is a compound of Formula I :

in which: X1 is -NHC(R1)(R2)X3 or -NHCH(R19) C (O) R20 ; X2 is -OH, -CO(O)NR12R12 or -OC(O)R14, wherein R12 and R14 are as defined below ; X3 is cyano,-C (R7)(R8)R16, -C(R6)(OR6)2, -CH2C(O)R16, -CH=CHS(O)2R5, -C(O)CF2C(O)NR5R5, -C(O) C (O) NR5R6,-C (O) C (O) OR5, -C(O)CH2OR5, -C(O)CH2N(R6)SO2R5 or-C (O) C (O) R5 ; wherein R5 is hydrogen, (C1-4) alkyl, (C3-10) cycloalkyl (Co-6) alkyl, hetero (C3-10) cycloalkyl (Co-3) alkyl, (C6-10)aryl(C0-6) alkyl, hetero (C5-10) aryl (C0-6)alkyl, (C9-10)bicycloaryl(C0-6)alkyl or hetero (Cg. to) bicycloaryl (Co-6) alkyl; R6 is hydrogen, hydroxy or (C 6) alkyl; or where X3 contains an-nu group, R and R6 together with the nitrogen atom to which they are both attached, form hetero (C3-10)cycloalkyl, hetero (C5-10) aryl or hetero (C8-10) bicycloaryl; R7 is hydrogen or (C1-4) alkyl and R8 is hydroxy or R7 and R8 together form oxo; R16 is hydrogen,- X4,-CF3,-CF2CF2R9 or-N (R6) OR6 ; R9 is hydrogen, halo, (C1-4) alkyl, (C5-10)aryl(C0-6)alkyl or (C5-io) heteroaryl (C0-6) alkyl; X4 comprises a heteromonocyclic ring containing 4 to 7 ring member atoms or a fused heterobicyclic ring system containing 8 to 14 ring member atoms and any carbocyclic ketone, iminoketone or thioketone derivative thereof; wherein within R5, X3 or X4 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (Cl 6) alkyl, (Cl 6) alkylidene, cyano, halo, halo-substituted (C1-4)alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R13, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(oR12)OR12, -X5NH12C(O)R13, -X5S(O)R13 and -X5S (0) 2Rl3 and/or 1 radical selected from -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14,

-X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wherein X5 is a bond or (C1-6)alkylene; R12 at each occurrence independently is hydrogen, (C1-6)alkyl or halo-substituted(C1-6)alkyl; R13 is (C1-6)alkl or halo-substituted(C1-6)alkyl; and R14 is (C3-10)cycloalkyl(C0-6)alkyl, hetero(C3-10)cycloalkyl(C0-3)alkyl, (C6-10)aryl(CC0-6)alkyl, hetero(C5-10)aryl(C0-6)alkyl, (C9-10)bicycloaryl(C0-6)alkyl or heero(C8-10)bicycloaryl(C0-6)alkyl; R1 is hydrogen or (C1-6)alkyl and R2 is selected from a group consisting of hydrogen, cyano, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5R12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O02NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13, -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR1,4, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wherein X5, R12, R13 and R14 are as defined above; or R1 and R2 taken together with the carbon atom to which both R1 and R2 are attached form (C3-8)cycloalkylene or (C3-8)heterocycloalkylene; wherein within said R2 any heteroaryl aryl, cycloalkyl, heterocycloalkyl, cycloalkylene or heterocycloalkylene is unsubstituted or substituted with 1 to 3 radicals independently selected from (C1-6)alkyl, (C1-6)alklidene, cyano, halo, halo-substituted(C1-4)alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR212)OR12, -X5R12C(O)R13, -X5S(O)R13, -X5S(O)2R13 and -X5C(O)R13, wherein X5, R12 and R13 care as defned above; R3 is -C(R6)(R6)X6, wherei R6 is hydrogen or (C1-6)alkyl and X6 is selected from -X5NR12R1,2 -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, 0X5OP(O)(OR12)OR12, -X5C(O)R13, -X5NR12C(O)R13, -X5S(O)R13, -X5S(O)2R13, -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14 -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12 wherein X5, R12, R13 and R14 are as defiend above; and R19 and R20 together with the atoms to which R19 and R20 are attached from] (C4-8)heterocycloalkylene, wherein no more than one of the ring member atoms comprising

the ring is a heteroatom selected from -NR21- or -O-, wherein and the ring is unsubstituted or substituted with R1, wherein R'is as defined above, and R2'is hydrogen,-C (O) OR, -C(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -S(O)R13 and -S(O)2R13, -S(O)R14, -S(O)2R14, -C(O)R14, -C(O)OR14, -C(O)NR12R12 and -S(O)2NR14R12, wherein R12, R13 and R14 are as defined above; wherein within R3, R4, R15, R17 and R18 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (Cl 6) alkyl, (Cl-6) alkylidene, cyano, halo, halo-substituted (C1-4) alkyl, nitro,-XSNR12R2,-X5NRIZC (O) R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5C(O)R13 and -X5S(O)2R13 and/or 1 radical selected from -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O02R14, -X5C(O)R14, -X5C(O)OR14, -X5OC(O)R14, -X5NR14R12, -X5NR12C(O)R14, -X5NR12C(O)OR14, -X5C(O)NR14R12, -X5S(O)2NR14R12, -5NR12S(O)2R14, -X5NR12C(O)NR14R12 And -X5NR12C(NR12)NR14R12; and within R3 and R4 any aliphatic moiety is unsubstituted or substituted further by 1 to 5 radicals independetnly selected from cyano, halo, nitro, -NR12R12, -NR12C(O)R12, -NR12C(O)OR12, -NR12C(O)NR12R12, -NR12C(NR12)NR12R12, -OR12, -SR12, -(O)OR12, -C(O)R12, -OC(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -R12S(O)2R12, -P(O)(OR12)OR12, -OP(O)(OR12)OR12, -NR12C(O)R13, -S(O)R13 and -S(O)2R13; wherein X5, R12, R13 and R14 are as described above; with the proviso that only one bicyclic ring structure is present within R3, R4 or Ris ; and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof ; and the pharmaceutically acceptable salts and solvates of such compounds and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof.

Preferred is a compound of Formula I : in which:

X1 is -NHC(R1)(R2) C (O) C (O) NR5R6, wherein R is hydrogen, (Cl 4) alkyl, (C3-10)cycloalkyl(C0-6) alkyl, hetero (C3-10)cycloalkyl(C0-3) alkyl, (C6-10)aryl(C0-6) alkyl, hetero (C5-10) aryl (Co-6) alkyl, (C9-lo) bicycloaryl (Co-6) alkyl or hetero (C8-10) bicycloaryl (Co-6) alkyl and R6 is hydrogen, hydroxy or (Cl 6) alkyl or Riz and R6 together with the nitrogen atom to which they are both attached form hetero (C3-10)cycloalkyl, hetero (C5 1o) aryl or hetero (C8-10)bicycloaryl ; X2 is hydrogen; wherein within Xi any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (C1-6)alkyl, (C1-6) alkylidene, cyano, halo, halo-substituted (Ci-4) alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12, -X5C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13 and -X5S(O)2R13 and/or 1 radical selected from -R14, -X5OR14, -X5SR14, -X5S(O)R14, -X5S(O)2R14, -X5C(O)R14, <BR> <BR> <BR> -X5C(O)OR14, -X5OC(O)R14, -X5NR14R1,2 -X5NR12C(O)R14, -X5NR12C(O)OR14,<BR> <BR> -X5C(O)NR12R12, -X5S(O)2NR14R12, -X5NR12S(O)2R14, -X5NR12C(O)NR14R12 and -X5NR12C(NR12)NR14R12, wherein X5 is a bond or (C1-6)alkylene; R12 at each occurrence independently is hydrogen, (C1-6)alkyl or halo-substituted(C1-6)alkyl; R13 is (C1-6)alkyl or halo-substituted (Ci-6) alkyl; and R14 is(C3-10) cycloalkyl (Co-6) alkyl, hetero (C3-10)cycloalkyl(C0-3)alkyl, (C6-10)aryl(C0-6) alkyl, hetero (C5-10) aryl (Co-6) alkyl, (C9, o) bicycloaryl (Co-6) alkyl or hetero (Cg-1o) bicycloaryl (Co-6) alkyl; R1 is hydrogen and R2 is (Cl 6) alkyl; and R3 is -CH2X6, wherein X6 is -X5NR12S(O)2R12 or -X5S(O)2R14 wherein X5, R12 and Rl4 are as defined above; wherein within R3 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (C1-6) alkyl, (CI 6) alkylidene, cyano, halo, halo-substituted(C1-4)alkyl, nitro, -X5NR12R12, -X5NR12C(O)R12, -X5NR12C(O)OR12, <BR> <BR> <BR> <BR> <BR> <BR> -X5NR12C(O)NR12R12, -X5NR12C(NR12)NR12R12, -X5OR12, -X5SR12, -X5C(O)OR12,<BR> -X6C(O)R12, -X5OC(O)R12, -X5C(O)NR12R12, -X5S(O)2NR12R12, -X5NR12S(O)2R12, -X5P(O)(OR12)OR12, -X5OP(O)(OR12)OR12, -X5NR12C(O)R13, -X5S(O)R13, -X5C(O)R13 and -X5S(O)2R13 and within R3 any aliphatic moiety is unsubstituted or substituted further by 1 to 5 radicals independently selected from cyano, halo, nitro, -NR12R12, -NR12C(O)R12, -NR12C(O)OR12, -NR12C(O)NR12R12, -NR12C(NR12)NR12R12, -OR12, -SR12, -C(O)OR12,

-C(O)R12, -OC(O)R12, -C(O)NR12R12, -S(O)2NR12R12, -NR12S(O)2R12, -P(O)(OR12)OR12, -OP(O)(OR12)OR12, -NR12C(O)R13, -S(O)R13 and-S (0) 2R 13 ; wherein X5, Rl2, R13 and R14 are as described above; with the proviso that only one bicyclic ring structure is present within R3 ; and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof; and the pharmaceutically acceptable salts and solvates of such compounds and the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixtures of isomers thereof.

Preferred are compounds of the invention in which X1 is -NHC(R1)(R2)X3 or -NHCH (Rl9) C (O) R20, wherein RI is hydrogen or (C1-6) alkyl and R2 is hydrogen, (C1-6) alkyl, X5OR12, -X5S(O)R13, -X5OR14, (C6-10) aryl (C0-6) alkyl or hetero (C5 l0) aryl (Co-6) alkyl or Rl and R2 taken together with the carbon atom to which both Rl and R2 are attached form (C3-6) cycloalkylene or (C3-6) heterocycloalkylene, wherein within said R2 any heteroaryl, aryl, cycloalkylene or heterocycloalkylene is unsubstituted or substituted with (Cl 6) alkyl or hydroxy, particularly wherein X3 is cyano,-C (O) R16,-C (R6) (OR6) 2,-CH=CHS (0) 2RS, -CH2C(O)R16, -C(O)CF2C(O)NR5R5, -C(O)C(O)NR5R6, -C(O)C(O)OR5, -C(O)CH2OR5, - C (O) CH2N (R6) SO2Rs or-C (O) C (O) R5, wherein R5, R6 and Rl6 are as described above, and R' and R20 together with the atoms to which R19 and R20 are attached form (C4-8) heterocycloalkylene, wherein no more than one of the ring member atoms comprising the ring is a heteroatom selected from-NR21-or-O-, particularly wherein the ring is unsubstituted or substituted with (CI 6) alkyl or -X5C(O)OR12 and R21 is hydrogen, (C1-6) alkyl, -X5C(O)R12, -X5C(O)OR12, -R1, -X5C(O)R14 or -C(O)OR14.

Particularly preferred are compounds of the invention in which X3 is cyano, -C(O)X4, -C(O) H,-C (O) N (CH3) OCH3,-CH (OCH3) 2,-C (O) CF3,-C (O) CF2CF3,-CH2C (O) RI 6, (E)-2-benzenesulfonyl-vinyl, 2-dimethylcarbamoyl-2,2-difluoro-acetyl, 2-oxo-2-pyrrolidin-1- yl-acetyl, 2-morpholin-4-yl-2-oxo-acetyl, 2-oxo-2-piperazin-1-yl-acetyl, 2- (4- <BR> <BR> <BR> methanesulfonyl-piperazin-1-yl)-2-oxo-acetyl, 2-(1,1-dioxo-1#6-thiomorpholin-4-yl)-2-oxo- acetyl, dimethylaminooxalyl, tetrahydro-pyran-4-ylaminooxalyl, 2-morpholin-4-yl- ethylaminooxalyl, cyclopentyl-ethyl-aminooxalyl, pyridin-3-ylaminooxalyl, phenylaminooxalyl, 1-benzoyl-piperidin-4-ylaminooxalyl, 1-benzylcarbamoyl-methanoyl, 1-benzyloxy (oxalyl), 2-benzyloxy-acetyl, 2-benzenesulfonylamino-ethanoyl, 2-oxo-2-phenyl-ethanoyl, 3H-oxazole-2-carbonyl, 5-trifluoromethyl-oxazole-2-carbonyl, 3- trifluoromethyl- [1, 2,4] oxadiazole-5-carbonyl, 2,2,3,3,3-pentafluoro-propionyl, hydroxyaminooxalyl, oxalyl, 2- (1, 3-dihydro-isoindol-2-yl)-2-oxo-acetyl, benzothiazol-2- ylaminooxalyl, 2-oxo-ethyl, 2-oxazol-2-yl-2-oxo-ethyl or 2-benzooxazol-2-yl-2-oxo-ethyl, particularly wherein X4 is lH-benzoimidazol-2-yl, pyrimidin-2-yl, benzooxazol-2-yl, benzothiazol-2-yl, pyridazin-3-yl, 3-phenyl- [1, 2,4] oxadiazol-5-yl, 5-ethyl- [1, 3,4]-oxadiazol- 2-yl, 5-ethyl- [1, 2,4]-oxadiazol-3-yl or 3-ethyl- [1, 2,4] oxadiazol-5-yl ; and R19 and R20 together with the atoms to which R'9 and R20 are attached form 1-benzoyl-3-oxo-piperidin-4-yl, 1- benzoyl-3-oxo-azepan-4-yl, 2-methyl-4-oxo-tetrahydro-furan-3-y, 2-ethyl4-oxo-tetrahydro-furan-3-yl, 4-ox9o-1-(1-phenyl-methanoyl)-pyrrolidin-3-yl or (S)-2-acetoxy-4-oxo-azetidin-3-yl.

Most particularly preferred are compounds of the invention in which X3 is-C (O) X4, in particular lH-benzoimidazol-2-ylcarbonyl, pyrimidin-2-ylcarbonyl, benzooxazol-2-ylcarbonyl, benzothiazol-2-ylcarbonyl, pyridazin-3-ylcarbonyl, 3-phenyl-[1, 2,4] oxadiazol-5-ylcarbonyl, 5-ethyl- [1, 2,4]-oxadiazol-3-ylcarbonyl, 5-ethyl- [1, 3,4]-oxadiazol-2-ylcarbonyl or 3-ethyl-[1, 2,4] oxadiazol-5-ylcarbonyl, or -C (O) C (O) NR5R6, in particular 2-oxo-2-pyrrolidin-1-yl-acetyl, 2-morpholin-4-yl-2-oxo- acetyl, 2-oxo-2-piperazin-1-yl-acetyl, 2- (4-methanesulfonyl-piperazin-1-yl)-2-oxo-acetyl, 2- (1, 1-dioxo-1#6-thiomorpholin-4-yl)--oxo-acetyl, diemthylaminooxalyl, tetrahydro- pyran-4-ylaminooxalyl, 2-morpholin4-yl-ethylaminooxalyl, cyclopentyl-ethyl-aminooxalyl, pyridin-3-ylaminooxalyl, phenylaminooxalyl or 1-benzoyl-piperidin-4-ylaminooxalyl.

Preferred are compounds of the invention in which X2 is -OH or-OC (O) NR12R12 particularly wherein each Rl2 independently represent hydrogen or (C1-6)alkyl, wherein said alkyl is unsubstituted or substituted with hydroxy or methoxy, or X2 is-OC (O) NHR14, wherein R14 is (C3 z0) cycloalkyl (C06) alkyl or hetero (C3-10cycloalkyl(C1-3) alkyl, or X2 is-OC (O) Ri4, wherein R14 is-NR22R23 and R22 and R23 together with the nitrogen atom to which both R22 and R23 attached form a hetero (C46) cycloalkyl ring, which ring may be unsubstituted or substituted with hydroxy, particularly in which X2 is selected from-OH, dimethylcarbamoyloxy, morpholin-4-ylcarbonyloxy, piperidin-1-yl-carbonyloxy, pyrrolidin-1-yl-carbonyloxy, pyrimidin-2-ylamino, tetrahydro-pyran4-ylamino, 1-methyl-piperidin-4-ylamino, N-(2-methoxyethyl0-N-(tetrahydeo-pyran-4=-yl)amino, isopropylamino and cyclohexylamino, <BR> <BR> <BR> <BR> 4-tert-butoxycarbonylpiperazin-1-ylcarbonyloxy, N-benzyl-carbamoyloxy, pyrrolidin-1-yl- carbonyloxy, N, N-dimethyl-carbamoyloxy, piperidin-1-yl-carbonyloxy, 4-methanesulfonyl- piperazin-1-yl-carbonyloxy, 4-ethoxycarbonylpiperazin-1-ylcarbonyloxy, N-cyclohexyl- carbamoyloxy, N-phenyl-carbamoyloxy, N- (5, 6,7,8-tetrahydro-naphthalen-1-yl)- carbamoyloxy, N-butyl-N-methyl-carbamoyloxy, N-pyridin-3-yl-carbamoyloxy, N-isopropyl- carbamoyloxy, N-pyridin-4-yl-carbamoyloxy, N-cyanomethyl-N-methyl-carbamoyloxy, N, N- bis-(2-methoxy-ehyl)-carbamoyloxy, N-phenethyl-carbamoyloxy, piperazine- carbonyloxy,

N-naphthalen-2-yl-carbamoyloxy, 4-benzyl-piperazine-1-carbamoyloxy, 4- (1-furan-2-yl- carbonyl)-piperazine-1-carbamoyloxy, thiomorpholin-4-yl-carbonyloxy, 1, 1-dioxo-1X6 thiomorpholin-4-yl)-carbonyloxy, bis- (2-methoxy-ethyl)-carbamoyloxy, morpholin-4-ylcarbonyloxy, 2-methoxyethylcarbamoyloxy, diethylcarbamoyloxy, pyrrolidin- 1-ylcarbonyloxy, 2-hydroxyethylcarbamoyloxy, tetrahydro-furan-2-ylmethylcarbamoyloxy, cyclopropylcarbamoyloxy, tert-butylcarbamoyloxy, 3-hydroxy-pyrrolidin-1-yl-carbonyloxy and carbamoyloxy, more particularly morpholin-4-ylcarbonyloxy, 2-methoxyethylcarbamoyloxy, diethylcarbamoyloxy, pyrrolidin-1-ylcarbonyloxy, 2-hydroxyethylcarbamoyloxy, tetrahydro-furan-2-ylmethylcarbamoyloxy, cyclopropylcarbamoyloxy, tert-butylcarbamoyloxy, 3-hydroxy-pyrrolidin-1-yl-carbonyloxy and carbamoyloxy.

Preferred are compounds of the invention in which X2 is-NHR'5, wherein R 15 is (C6 s0) aryl, hetero (C5-lo) aryl, (C9-10)bicycloaryl or hetero(C8-10)bicycloaryl, or -NR17R18, wherein Rl7 is hetero (C3 l0) cycloalkyl and Rl8 is hydrogen or R17 and Rl8 independently are (C6 so) aryl (CI 6) alkyl or hetero (Cs IO) aryl (Cl 6) alkylS wherein within R15, R17 aIld Rl8 any alicyclic or aromatic ring system is unsubstituted or substituted further by 1 to 5 radicals independently selected from (Cl 6) alkyl, cyano, halo, nitro, halo-substituted (CI 4) alkyl, -X5OR12, -X5C(O)OR12, -X5C(O)R13, -X5C(O)NR12R12, -X5NR12S(O)2R12 and/or 1radical selected from -R14, -X5OR14 and -X5C(O)NR14R12, in particular in which X2 is selected from 5-nitrothiazol-2-ylamino, 2-nitrophenylamino, pyrimidin-2-ylamino, tetrahydro- pyran-4-ylamino, N-(2-methoxyethyl)-N-(tetrahydro-pyran-4-yl) amino, 1-methyl-piperidin-4- ylamino, isopropylamino, di (thien-2-ylmethyl) amino or di (benzyl) amino.

Preferred are compounds of the invention in which X2 is-OR4 wherein R4 is 4-methoxy-phenyl, 4'-hydroxymethyl-phenyl, methoxymethyl, phenyl-methanoyl, 1- (4- phenoxy-phenyl)-methanoyl, 3-biphenyl, 4-biphenyl, 1-biphenyl-4-yl-methanoyl, naphthalen- 2-yl-methanoyl, benzo [1,3] dioxol-5-yl-methanoyl, (4-methanesulfonylamino-phenyl)- methanoyl, benzo [b] thien-2-yl-methanoyl, 4'-chloro-4-biphenyl, 4-hydroxy-phenyl- methanoyl, 3-chloro-benzo [b] thien-2-yl-methanoyl, thien-2-yl-methanoyl, thien-3-yl- methanoyl, 3-chloro-thien-2-yl-methanoyl, 5-methyl-thien-2-yl-methanoyl, 4-methoxy-phenyl methanoyl, 4-trifluoromethoxy-phenyl methanoyl, 4-chloro-phenyl-methanoyl, 3-bromo- phenyl, cyclohexylmethyl, 3,4-dimethoxy-phenyl-methanoyl, 3,4-difluorophenyl-methanoyl, 3-fluoro, 4-methoxy-phenyl-methanoyl, 4-fluorophenyl-methanoyl, 4-trifluoromethyl-phenyl- methanoyl, 4-formyl-phenyl-formyl, 3-formyl-phenyl-formyl, 4-methyl-pentanoyl, tetrahydro-

pyran-4-ylmethyl 2-morpholin-4-yl-2-oxo-ethyl.

Most particularly preferred are compounds of the invention in which X2 is selected from-OH, dimethylcarbamoyloxy, morpholin-4-ylcarbonyloxy, piperidin-1-yl-carbonyloxy, pyrrolidin-1-yl-carbonyloxy, pyrimidin-2-ylamino, tetrahydro-pyran-4-ylamino, 1-methyl- piperidin-4-ylamino, N-(2-methoxyethyl)-N-(tetrahydro-pyran-4-yl) amino, isopropylamino and cyclohexylamino.

Preferred are compounds of the invention in which Ru ils hydrogen or (Cl 6) alkyl and R is hydrogen,-X50R,-X'R, (C5-1,,) heteroaryl (Co-6) alkyl, (CS_lo) aryl (Co-6) alkyl, (C5-io) cycloalkyl (Co-6) alkyl, (C5-lo) heterocycloalkyl (Co-6) alkyl or (C1-6) alkyl; or Rl and R2 taken together with the carbon atom to which both R'and R2 are attached form (C3-8) cycloalkylene or (C3-8) heterocycloalkylene; wherein within said R2 any heteroaryl, aryl, cycloalkyl, heterocycloalkyl, cycloalkylene or heterocycloalkylene is optionally substituted with 1 to 3 radicals independently selected from (Cl 6) alkyl and hydroxy; particularly in which R'is hydrogen or methyl and R2 is hydrogen, methoxymethyl, (C1-6) alkyl, phenethyl, thien-2-yl or 5-methyl-furan-2-yl or R'and R2 taken together with the carbon atom to which both Rl and-R2 are attached form cyclopropylene, tetrahydro-pyran-4-ylene or methyl-piperidin-4-ylene.

Preferred are compounds of the invention in which R3 is-CH2X6 ; wherein X6 is is selected from -X5SR12, -X5C(O)NR12R12, -X5S(O02R13, -X5C(O)R13, -X5OR12, -X5SR14, -X5R14, -X5S(O)2R14, -X5C(O)R14, -X5C (O) NRI4Rl2, wherein X5, RI2, Rl3 and Rl4 are as defined above; particularly wherein R3 is thiophene-2-sulfonyl-methyl, 3-chloro-2-fluoro-phenyl-methane-sulfonyl-methyl, benzene-sulfonyl-methyl, phenyl-methane-sulfonyl-methyl, 2-(1,1-difluoro-methoxy)-phenyl-methane-sulfonyl-methyl, 2-benzene- sulfonyl-ethyl, 2-(pyridine-2-sulfonyl)-ethyl, 2-(pyridine-4-sulfonyl)-ethyl, 2-phenyl-methanesulfonyl-ethyl, oxy-pyridin-2-yl-methane-sulfonyl-methyl, prop-2-ene-1-sulfonyl-methyl, 4-methoxy-phenyl-methane-sulfonyl- <BR> <BR> <BR> <BR> methyl, p-tolyl-methane-sulfonyl-methyl, 4-chloro-phenyl-methane-sulfonyl-methyl, o-tolyl-methane-sulfonyl- methyl, 3,5-dimethyl-phenyl-methane-sulfonyl-methyl, 4-trifluoro-emthyl-phenyl-methane-sulfonyl-methyl, 4-trifluoro-methoxy-phenyl-methane-sulfonyl-methyl, 2-bromo-phenyl-methane-sulfonyl-methyl, pyridin-2-yl- methane-sulfonyl-methyl, pyridin-3-yl-methane-sulfonyl-methyl, pyridin-4-yl-methane-sulfonyl-methyl, naphthalen-2-yl-methane-sulfonyl-methyl, 3-methyl-phenyl-methane-sulfonyl-methyl, 3-trifluoro- methyl-phenyl-methane-sulfonyl-methyl, 3-trifluoro-methoxy-phenyl-methane-sulfonyl-methyl, 4-fluoro-2-trifluoromethoxy-phenyl-methane-sulfonylmethyl, 2-fluoro-6-trifluoromethyl-phenylmethanesulfonylmethyl, 3-chloro-phenylmethanesulfonylmethyl, 2-fluoro-phenylmethanesulfonylmethyl, 2-trifluoro-phenylmethanesulfonylmethyl, 2-cyano-phenylmethanesulfonylmethyl, 4-tert-butyl-phenylmethanesulfonylmethyl, 2-fluoro-3-methyl-phenyl- methane-sulfonyl-methyl, 3-fluoro-phenylmethanesulfonylmethyl, 4-fluoro-phenylmethane-sulfonylmethyl, 2-chloro-phenylmethanesulfonylmethyl, 2,5-difluoro-phenylmethane-sulfonylmethyl,

2,6-difluoro-phenylmethanesulfonylmethyl, 2,5-dichloro-phenyl-methane-sulfonylmethyl, 3,4-dichloro-phenylmethanesulfonylmethyl, 2- (1, 1-difluoro-methoxy)-phenyl-methanesulfonylmethyl, 2-cyano-phenyl-methane-sulfonyl-methyl, 3-cyano-phenylmethanesulfonylmethyl, 2-trifluoro-methoxy-phenyl- methane-sulfonylmethyl, 2,3-difluoro-phenylmethanesulfonylmethyl, 2,5-difluoro-phenyl- methanesulfonylmethyl, biphenyl-2-ylmethanesulfonylmethyl, cyclohexylmethyl, 3-fluoro-phenyl- methanesulfonylmethyl, 3,4-difluoro-phenyl-methanesulfonylmethyl, 2,4-difluoro-phenylmethanesulfonylmethyl, 2,4,6-trifluoro-phenylmethanesulfonylmethyl, 2,4,5-trifluoro-phenylmethanesulfonylmethyl, 2,3,4-trifluoro-phenylmethanesulfonylmethyl, 2,3,5-trifluoro-phenyl-methane-sulfonylmethyl, 2,5,6-trifluoro-phenylmethanesulfonylmethyl, <BR> <BR> <BR> 2-chloro-5-trifluoro-methylphenylmethanesulfonylmethyl, 2-methyl-propane-1-sulfonyl, 2-fluoro-3-trifluoro- methylphenylmethanesulfonylmethyl, 2-fluoro-4-trifluoro-methylphenylmethanesulfonylmethyl, 2-fluoro-5-trifluoro-methyl-phenyl-methane-sulfonyl-methyl, 4-fluoro-3-trifluoro- methylphenylmethanesulfonylmethyl, 2-methoxy-phenyl-methanesulfonylmethyl, 3,5-bis-trifluoromethyl-phenylmethanesulfonylmethyl, 4-difluoromethoxy-phenylmethanesulfonylmethyl, 2-difluoro-methoxy-phenyl-methanesulfonylmethyl, 3-difluoromethoxy-phenylmethanesulfonylmethyl, 2,6-dichloro-phenylmethanesulfonylmethyl, biphenyl-4-ylmethanesulfonylmethyl, 3,5-dimethyl-isoxazol-4-ylmethanesulfonylmethyl, 5-chloro-thien-2-yl-methane-sulfonylmethyl, <BR> <BR> <BR> 2- 4- (1, l-difluoro-methox. y)-benzenesulfonyl]-ethyl, 2- [2- (l, 1-difluoro-methoxy)-benzenesulfonyl]-ethyl,<BR> <BR> <BR> 2- [3- (1, 1-difluoro-methoxy)-benzenesulfonyl]-ethyl, 2-- (4-trifluoromethoxy-benzenesulfonyl)-ethyl,<BR> <BR> <BR> 2-(3-trifluoromethoxy-benzenesulfonyl)-ethyl, 2-(2-trifluoro-rnethoxy-benzene-sulfonyl)-ethyl, (cyanomethyl-methyl-carbamoyl)-methyl, biphenyl-3-ylmethyl, 2-oxo-2-pyrrolidin-1-yl-ethyl, 2-benzenesulfonyl-ethyl, isobutylsulfanylmethyl, 2-phenylsulfanyl-ethyl, cyclohexylmethanesulfonylmethyl, 2-cyclohexyl-ethanesulfonyl, benzyl, naphthalen-2-yl, benzylsulfanylmethyl, 2-trifluoromethyl-benzylsulfanylmethyl, phenylsulfanyl-ethyl, cyclopropyl-methanesulfonylmethyl, 5-bromo- thien-2-ylmethyl, 3-phenyl-propyl, 2,2-difluoro-3-phenyl-propyl, 3,4,5-trimethoxy- phenylmethanesulfonylmethyl, 2,2-difluoro-3-thien-2-yl-propyl, cyclohexylethyl, cyclohexylmethyl, tert- butylmethyl, 1-methylcyclohexylmethyl, 1-methylcyclopentylmethyl, 2,2-difluoro-3-phenylpropyl, 2,2-dimethyl- 3-phenylpropyl, 1-benzylcyclopropylmethyl,-XSS (O) 2R" and-X5S (O) 2Rl4, wherein Rl3 is alkyl and R14 is phenyl which phenyl is unsubstituted or substituted.

Preferred are compounds of the invention in which R3 is cyclohexylethyl, cyclohexylmethyl, tert- butylmethyl, 1-methylcyclohexylmethyl, 1-methylcyclopentylmethyl, 2,2-difluoro-3-phenylpropyl, 2,2-dimethyl- 3-phenylpropyl, 1-benzylcyclopropylmethyl,-X5S (O) 2Rl3 or-X5S (O) 2Rl4, wherein Rl3 is alkyl and Rl4 is phenyl which phenyl is unsubstituted or substituted.

The following tables are intended to provide guidance to better carry out the present invention.

However, they do not limit the scope of the invention. People of ordinary skill may selectively make particular compounds by joining O*, HN* or H* of one of the fragments (A1 to A62) shown in Table 1 to the methine carbon atom (*CH*) of one of the fragments (BI to B93) shown in Table 2, and joining the methine carbon atom (*CH* or *CF*) of one of the fragments (B 1 to B93) hown in Table 2 to the acyl carbon atom (C*) of one of the fragments (Cl to C91) depicted in Table 3.

TABLE 1 Al N A5 0 0* A6 A4 CNAO* A5 \o < o* A6 X sio* tizzy N 0* si fizz o'k AT9A8oA9o CN O* N 0* <0* N kO* 0* A10o'AllJJA12 A10 o All o A12 H Ne , s i H 13 ° 14 Q 15 a w o* o- : o*. NJo* A13 1°l i14 lol A15 lol i6 r" ? o* o* rr'\o* N 0 0 /O O A19 20 0 A21 0 0* HN , 0* HOe xi c 22 23 0 24 N o* f°* S HS * EtOyN H ci \ EtO N H y C1 0 A25 1° A26 A27 o* S w o*'w o* MeO A28 o A29 o A30 o Me \ I o* I o* I p* / Cl CF30 A31 0 A32 0 A33 0 IJ HZN p N 0* N O* N/\O*/ H FI N-_O* H 34 0 35 ° 36 ° o I N/\o* NH2 L z Nu2 37 ° 38 39 ° p zizi CF3 Me0 Cl 40 ° 41 42, o MeO I o* N N 0* FEZ F MeO'H A43oA44oA45o IIII IIII/o* (CH (CH3) aCHCHaCHO* N 0* 3 2 2 Fie 0 F 46 47, I o 48 N i I o (CH3) CHNH O* \ \ H H H H 49 50 51 ° NCN O* r NO* i * 0 O* O 52 53 0 54 HN N k N oll-- O 55 i 56 il 57 43 ZNCNXo* CN O* ? J nu s i 0 58 59 60 0 N N* I/% Q NH* S NFi* ! 0 S NH* 1 ouzo 61 * 62 * TABLE 2 1 2 1 3 \ /'H OZS 0 *CH* o2sX *CH* *CH* *ex* 4 I 5 ocxFz 6 of '1'' O S O S *CH* *CH* *CH* B7 B8 B9 OaS N OaS Osa8 *CH* *CH* *CH* 10 Bll 11 I 12 No o, s '*cl* *CH* *CH* *CH* B13H3 I 14 1 I 15 i OaS\ 02S 02s) *CH* *CH* *CH* 16 X 17 F3C B18 F3CO CH3 aS S osts\ 02S X *CH* *CH* *CH* B19 B20 B21 i r o2s I i ozs O2S) O2Sx O2S *CH* OaS\ *CH* *CH* B22 B23 B24 ci N cri ouas *CH* *CH* i B25 ¢ B26 B26 B27 ouf3 i i i OaS\ o2sX o2sX *CH* *CH* *CH* B28 ci B29 B30 OaS\ OaS\ asz *CH* *CH* *CH* B31'Bu B32 B33 02S 02S 02S I I *CH* *CH* *CH* B34 en, B35 F B36 1 ozs ozs\ o s *CH* I *CH* *CH* B37 F bu ci *CH* OaS\ F 02s *CH* *CH* 40 41 NC 42 ocF3 os)-I o, s ! ! OZS\ *CH* *CH* *CH* *CH* B43 F B44 B45 \ F. 0 2s zu 1 Hz *cl* ! *CH* *ce* / *cl* O S *CH* B49 F B50 F B51 F F 0, S 0, S 1 F F I/ F OaS\ OaS\ ors\ *CH* *CH* B52 B53 B54 cl3 cl3 F OZS 0, S F 02s *CH* *CH* *CH* CFs 56 CFa I F 57 I F / 02S\ F OaS *CH* *CH* *CH* B58 H o s) 0 0 \ F IIII 1 F OZS OaS\ Oz5\ I *CH* *CH* *CH* B61 CF3 B62 OCH3 B63 CF3 i i 02S CF3 OS OS . _ __' *CH* *CH* B64cHo"''"B65 ocHF, B66 ci" / os ci os O S *CH* *CH* *CH* *CH* 67, 6g N CH3 69 ci 0/S Fizz \ CH3 OsS\ OzS\ *CH* *CH* B70 OCHF2 B71 F2HCO B72 OCHF2 os os OaS OaS *cl* ou B73 OCF3 B74 CP 30 B75 OCF3 oas ozs ozs *CH* *CH* *CH* B76 B77 B78 -1/0 1 so i v rlrx r I *cx* o s o 1 *CH* *CH* 79 80 81 s s ors *ce* *cx* *cx* 82 83, 84, I *CH* . so2 I *CH* *CH* *CH* B82 < B83 < B84 < B85 B86 3 B87 OaS\ *cl* I *CH* *CH* B88 B89 B90 S S F *caf* *CH* *CH* 91 Mg 92 s 93 MeO Fuzz /F 02S) *CH* OzS\ *CH* I *CH* TABLE 3 X vC C2 ß N C W 2 i U iN iN C *C *li *C 1 O C4 CN CS N CN C6 H O g *II * I N N cN N cl, J o N r cx3 C7 H 0 C8 0 C9 H 0 N N N N N *C CF3 * : II * o NJ o C 13 N N C11 *c N CN C12 0 0 . 0 - r -Nt 0 c° r °/S o o aJ/ s 0 0 IT C13 FS C14 x ° o° C1. 5 ° 'IN 0 N *C H II *C H'I O N p N \ 0 N 0 N N-b : YN *C H H i S *C , s H II _ I I p N zu C19/N-o C20 N ° C21 0 C H H I 0 p/*C = 11 OvN *C/N N \ O N /II \ II zozo C22 H o i I C23 H o I C24 HZ N N II = *c *II _ II O O 0 O/ C25 H o o C26 H ° C27 H o * C *C Han 0 F \ C26 zozo C28 o i C29 o i C30 H ! ! H ! j H ! H !) H O II II v o j p o 0 0 o o s 0 0 0 0 0 0 0 o N o II _ / NH c-AH C34 a C35 H ° C36 ° 0 N 0 0 *CN O p N *IOI = O \ C3'7 0 C38 0 o C39 0 r N-N H A I ( *C '--N N N N, 0 0 ly y /o j o o o C40 °. o° C41 i° C42 II H C) S-H \/u HN,, *C. N N 11 ouzo C43 H ° H C44 x ° H C45 0 0 0 0 0 0 0 0 0 0 HN 90 C46 H 0 H C47 0 C48 H"0 C *-il ouzo C46 H ° H C47 H ° H C48 H ° iN N * N N wiN N Il o j o o j o j o N o N /I \ C49 H ° C50 H ° C51 H o *N/*CiN 0 *CN O II II II = II O N \ O p N O C52 0 C53 H : 5N 0 H c C54 H 'N 0, N /O 0 / C55 0 C56 H 0 C57 0 H H"H M OH R X A X *C *C"N II O N p N \ 0 0 N /su zozo C58 H ° C59 H ° C60 H o iN iN iN O C-IN 0 *C"N 0 *C'IN 0 0 N 0 N 0 N C61 H C62 O-FS C63 -IN 0 0 Y-N X, N zany *C iN. wN O O O ß Oc O 0 C64 H ° C65 H ° i C66 H o 0 N 4 0 N-t 0 N t '' ! o o 0 N 0 N-/ o N-/0 N--y C67 H ° C68 H C69 H o N p N N C H 0 N C70 *C HN H C71 0 C72 H o N */N H *C/H 0 H / C73 H ° C74 0 C75 °II C o o w Hz O O N O O 0 h!! 0 0 N'-/ 0 C76 C77 H ° C78 H o 0 N _o N,)-0 Hjy *C"*C C 11 0 0 N_ 0 o 0 6 / \ C79 H ° C80 x ° C81 x o N O N O N O O j N/O NJ O N O C82 x ° C83 H ° C84 H o wu O N O N O F C83 > O NJ O NJ O N ( \caf3 N N 0 H 'Y T "T ° ° o. /o % O OU CF3/ N F N C89"f ! C90R F C89 CF C o ici N *C, 0 XI C91 H o N O C88N C89 C90 O N

For convenience, compounds of the present invention may be referenced to by their "A","B", and"C"fragment combinations. Thus, for example, the compound referenced as A7-B4-C 13 is the product of the combination of group A7 in Table 1 and B4 in Table 2 and C13 in Table 3, namely pyrrolidine-1-carboxylic acid (R) (S)-l-(1-benzooxazol-2-yl- methanoyl)-propylcarbamovl]-2-phenylmethanesulfonyl-ethyl ester :

Further preferred compounds of Formula I are provided in the following: (R)-N-cyanomethyl-2-hydroxy-3-phenylmethanesulfonyl-propiona mide ; (R)-N- (l-cyano-I-thiophen-2-yl-methyl)-2-hydroxy-3-phenyhnethanesu lfonyl-propionamide ; (R)-N (1-cyano-1-thiophen-2-yl-methyl)-3- [2- (l, l-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionamide ; (R)-N-cyanomethyl-3- [2- (1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-2-hydroxy- propionamide; morpholine-4-carboxylic acid (R)-1- (cyanomethyl-carbamoyl)-2-phenylmethanesulfonyl-ethyl ester; morpholine-4-carboxylic acid (R)-1-(cyanomethyl-carbamoyl)-2-[2-(1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-ethyl ester; (R)- (2-methoxy-ethyl)-carbamic acid 1- (cyanomethyl-carbamoyl)-2-phenylmethanesulfonyl-ethyl ester; (S)-diethyl-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-pyrrolidine-l-carboxylic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-morpholine-4-carboxylic acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-4-Ethyl-piperazine-1-carboxylic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-2-hydroxymethyl-pyrrolidine-1-carboxylic acid (S)-1-(cyanomethyl-carbamoyl)-2cyclohexyl-ethyl ester; (S)- (2, 2,2-Trifluoro-ethyl)-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)- (2-hydroxyethyl)-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (Tetrahydrofuran-2-ylmethyl)-carbamic acid (S)-l- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-Azetidine-l-carboxylic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-cyclopropyl-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-piperidine-l-carboxylic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-(2-methoxy-ethyl)-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (R)-3-hydroxy-pyrrolidine-1-carboxylic acid (S)-1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (S)-3-hydroxy-pyrrolidine-1-carboxylic acid (S)-1- (cyanomethyl-carbamoyl)-2-cyclohexyl- ethyl ester;

(S)-morpholine-4-carboxylic acid 1- (cyanomethyl-carbamoyl)-3-cyclohexyl-propyl ester; morpholine-4-carboxylic acid (R)-1-[(S)-1-(1-benzooxazol-2-yl-methanoyl)- propylcarbamoyl]-2-phenylmethanesulfonyl-ethyl ester; morpholine-4-carboxylic acid (R)-1- [ (5)-1- (1-benzooxazol-2-yl-methanoyl)- propylcarbamoyl]-2- [2- (l, l-difluoro-methoxy)-phenylmethanesulfonyl]-ethyl ester; morpholine-4-carboxylic acid (R)-1-[(S)-1-(1-benzothiazol-2-yl-methanoyl)- propylcarbamoyl]-2- [2- (1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-ethyl ester; pyrrolidine-1-carboxylic acid (R)-1-[(S)-1-(1-benzooxazol-2-yl-methanoyl)- propylcarbamoyl]-2-phenylmethanesulfonyl-ethyl ester; dimethyl-carbamic acid (R)-1-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propylcarbamoyl] -2- phenylmethanesulfonyl-ethyl ester; morpholine-4-carboxylic acid (R)-1- [ (S)-1- (1-benzylcarbamoyl-methanoyl)- propylcarbamoyl]-2-phenylmethanesulfonyl-ethyl ester; morpholine-4-carboxylic acid (S)-1-[(S)-1-(oxazolo [4,5-b] pyridine-2-carbonyl)-propylcarbamoyl]-2- phenylmethanesulfonyl-ethyl ester; morpholine-4-carboxylic acid (S) -1-[(S)-1-(5-ethyl-[1, 3,4] oxadiazole-2-carbonyl)-propylcarbamoyl]-2- phenylmethanesulfonyl-ethylester; (S)-2- {(R)-3-[2-(1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-2-hydroxy- propanoylamino}-N-methoxy-N-methyl-butyramide ; <BR> <BR> <BR> <BR> (R)-3-[2-(1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-N-((S)-1-formyl-p ropyl)-2-hydroxy- propionamide ; <BR> <BR> <BR> <BR> (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-2-hydrox y-3-phenyl-methanesulfonyl- propionamide; (S)-3- {3-[2-(1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-propanoylamino}-2 -oxo- pentanoic acid benzylamide; N-[(S)-1-(1-benzooxazol-2-yl-methyl)-propyl]-3-[2-(1,1-diflu oro-methyl)- phenylmethanesulfonyl]-propionamide ; N [ (S)-1- (1-benzooxazol-2-yl-methanoyl)-3-phenyl-propyl]-3-p-tolylmet hanesulfonyl-propionamide ; 3-(2-difluoromethoxy-phenylmethanesulfonyl)-N-(1-ethyl-2, 3-dioxo-3-pyrrolidin-1-yl- propyl)-propionamide ; 3-(2-difluoromethoxy-phenylmethanesulfonyl)-N-(1-ethyl-3-mor pholin-4-yl-2,3-dioxo- propyl)-propionamide; 3-(2-difluoromethoxy-phenylmethanesulfonyl)-N-(1-ethyl-2, 3-dioxo-3-piperazin-1-yl-propyl)- propionamide;

3- (2-difluoromethoxy-phenylmethanesulfonyl)-N [3- (1, 1-dioxo-116-thiomorpholin-4-yl)-1- ethyl-2,3-dioxo-propyl]-propionamide; <BR> <BR> <BR> <BR> 3- (2-difluoromethoxy-phenylmethanesulfonyl)-N [1-ethyl-3- (4-methyl-sulfonyl-piperazin-1- yl)-2,3-dioxo-propyl]-propionamide; 3- [3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid dimethylamide ; 3- [3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid cyclopentyl-ethyl-amide; 3- [3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid phenylamide; 3- [3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid pyridin-3-ylamide ; 3- [3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid (tetrahydro-pyran-4-yl)-amide; <BR> <BR> <BR> <BR> 3- [3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid (1- benzoyl-piperidin-4-yl)-amide ; 3- [3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid (2-morpholin-4-yl- ethyl)-amide ; (R)-N- [ (S)-1- (l-benzooxazol-2-yl-methanoyl)-propyl]-2- (2-nitro-phenylamino)-3- phenylmethanesulfonyl-propionamide ; N-[1-(benzooxazole-2-carbonyl)-propyl]-3-phenylmethanesulfon yl-2-(pyrimidin-2-ylamino)- propionamide.

(R)-N- [(S)-1-(1-benzooxazol-2-yl-methanoyl)-butyl]-2-(5-nitro-hiaz ol-2-ylamino)-3- phenylmethanesulfonyl-propionamide ; (2S) (4,4-difluoro-2-hydroxy-5-phenyl-pentanoic acid (1 (S)-cyano-3-phenyl-propyl)-amide; N- (l (S)-cyano-3-phenyl-propyl)-2- (S)- (2-morpholin-4-yl-2-oxo-ethoxy)-4-phenyl-butyramide ; N- (l- (S)-cyano-3-phenyl-propyl)-2- (S)-fluoro-4-phenyl-butyramide ; N- (l- (S)-cyano-3-phenyl-propyl)-2, 2-difluoro-4-phenyl-butyramide ; N- (l- (S)-cyano-3-phenyl-propyl)-2- (S)-hydroxy-4-phenyl-butyramide ; N- (l- (S)-cyano-3-phenyl-propyl)-2- (R)-hydroxy-4-phenyl-butyramide ; N- (1- (S)-cyano-3-phenyl-propyl)-2- (R)-methoxy-4-phenyl-butyramide ; 2,2-difluoro-5-phenyl-pentanoic acid (1-cyano-cyclopropyl)-amide ; N- (l- (S)-cyano-3-phenyl-propyl)-4-phenyl-butyramide ;

2,2-difluoro-5-phenyl-pentanoic acid ((S)-1-cyano-3-phenyl-propyl)-amide; N-(4-cyano-1-ethyl-piperidin-4-yl)-3-cyclohexyl-propionamide ; N- (4-cyano-1-ethyl-piperidin-4-yl)-3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionamide ; (S)-tert-butyl-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (R)-carbamic acid 1- (cyanomethyl-carbamoyl)-2- (2-difluoromethoxy- phenylmethanesulfonyl)-ethyl ester; (S)-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester; (R)-morpholine-4-carboxylic acid 1- (1-cyano-cyclopropylcarbamoyl)-2-phenylmethanesulfonyl-ethyl ester; (R)-morpholine-4-carboxylic acid 1- (4-cyano-tetrahydro-pyran-4-ylcarbamoyl)-2-phenylmethanesulf onyl-ethyl ester; 3-cyclohexyl-2-hydroxy-N- [1- (oxazolo [4,5-b] pyridine-2-carbonyl)-propyl]-propionamide ; (R)-N- [1- (benzothiazole-2-carbonyl)-butyl]-2-isopropylamino-3-phenylm ethanesulfonyl- propionamide ; <BR> <BR> <BR> <BR> (R)-N- [1- (benzothiazole-2-carbonyl)-butyl]-3-phenylmethanesulfonyl-2- (tetrahydro-pyran-4- ylamino)-propionamide ; (R)-N- [1- (benzothiazole-2-carbonyl)-butyl]-2-dibenzylamino-3-phenylme thanesulfonyl- propionamide; (R)-N- [1- (benzothiazo] e-2-carbonyl)-butyl]-2-dimethylamino-3-phenylmethanesulfonyl - propionamide; <BR> <BR> <BR> <BR> (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-3-phenylmethane sulfonyl-2-(tetrahydro-pyran- 4-ylamino)-propionamide; (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-(1-methyl-pip eridin-4-ylamino)-3- phenylmethanesulfonyl-propionamide ; (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-(bis-thiophen -2-ylmethyl-amino)-3- phenylmethanesulfonyl-propionamide ; (R)-N- [(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-dibenzylamino-3-phe nylmethanesulfonyl- propionamide; (S)-N- [(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-(tetrahydro-pyran-4 -ylamino)-3-thiophen-2- yl-propionamide; (S)-N- [ (S)-I- (benzoxazole-2-carbonyl)-butyl]-2-isopropylamino-3-thiophen- 2-yl- propionamide ; <BR> <BR> <BR> <BR> (R)-N- [1- (benzothiazole-2-carbonyl)-butyl]-3-phenylmethanesulfonyl-2- (tetrahydro-pyran-4- ylamino)-propionamide; <BR> <BR> <BR> <BR> (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-3-phenylmethane sulfonyl-2-(tetrahydro-pyran- 4-ylamino)-propionamide ;

(R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-isopropylamin o-3-phenylmethanesulfonyl- propionamide; <BR> <BR> <BR> <BR> (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-[(2-methoxy-e thyl)-(tetrahydro-pyran-4-yl)- amino]-3-phenylmethanesulfonyl-propionamide ; (R))-N-{(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-cyclohexylam ino-3-phenylmethanesfulonyl- propionamide ; (R))-N-{(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-dimethylamin o-3-phenylmethanesfulonyl- propionamide; (1 S)-N- [I- (benzooxazole-2-carbonyl)-butyl]-2- (S)-fluoro-4-phenyl-butyramide ; 2,2-difluoro-5-phenyl-pentanoic acid [(S)-1-(benzoxazole-2-carbonyl)-butyl]-amide ; morpholine-4-carboxylic acid (S)-1-[(S)-1-(benzooxazole-2-carbonyl)-propylcarbamoyl]-2-cy clohexyl-ethyl ester; morpholine-4-carboxylic acid (S)-2-cyclohexyl-1-[(S)-1-(oxazolo [4,5-b] pyridine-2-carbonyl)-propylcarbamoyl]- ethyl ester; morpholine-4-carboxylic acid (S)-2-cyclohexyl-1-[(S)-1-(5-ethyl-[1, 3,4] oxadiazole-2-carbonyl)- propylcarbamoyl]-ethyl ester; morpholine-4-carboxylic acid (S)-2-cyclohexyl-1-[(S)-1-(5-phenyl-[1, 3, 4] oxadiazole-2-carbonyl)- propylcarbatnoyl]-ethyl ester, morpholine-4 carboxylic acid (S)-1-[(S)-1-(benzooxazole-2-carhonyl)-propylcarbamoyl]-3-cy cloheY. yl-propy] ester; 4-[4,4-dimethyl-2-(morpholine-4-carbonyloxy)-pentanoylamino] -3-oxo-azepane-1-carboxylic acid benzyl ester; <BR> <BR> <BR> <BR> (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-3-cyclopropylme thanesulfonyl-2-(tetrahydro-pyran-4-ylamino)- propionamide ; (R)-N- [1- (benzoxazole-2-carbonyl)-butyl]-2-cyclohexylamino-3-cyclopro pylmethanesulfonyl-propionamide ; (R)-N- [1- (benzoxazole-2-carbonyl)-butyl]-2-cycloheptylamino-3-cyclopr opylmethanesulfonyl-propionamide ; <BR> <BR> <BR> (R)-3-phenylmethanesulfonyl-N-[(S)-3-phenyl-1-(thiazole-2-ca rbonyl)-propyl]-2-(tetrahydro-pyran-4-ylamino)- propionamide; <BR> <BR> <BR> (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-3-phenyl-propyl]-3-cyc lopropylmethanesulfonyl-2-(tetrahydro-pyran-4- ylamino)-propionamide ; (R)-3-cyclopropylmethanesulfony l-N-[1-(5-ethyl-1, 2, 4-oxadiazole-3-carbonyl)-propyl]-2-(tetrahydro-pyran-4- ylamino)-propionamide; (R)-3-phenylmethanesulfonyl-N-[1-(3-phenyl-1, 2,4-oxadiazole-5-carbonyl)-propyl]-2- (tetrahydro-pyran-4- ylamino)-propionamide ; (R)-N- [1- (3-cyclopropyl-1, 2,4-oxadiazole-5-carbonyl)-propyl]-3-phenylmethanesulfonyl-2 - (tetrahydro-pyran-4- ylamino)-propionamide ; {(R)-1-[1-(benzothiazol-2-yl-hydroxy-methyl)-butylcarbamoyl] -2-phenylmethanesulfonyl- ethyl}-carbamic acid tert-butyl ester;

{(R)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoy l]-2-phenylmethanesulfonyl- ethyl}-carbamic acid tert-butyl ester; {(S)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoy l]-2-thiophen-2-yl-ethyl}- carbamic acid ter-butyl ester; <BR> <BR> <BR> <BR> f (R)-1- [1- (benzothiazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-phenylm ethanesulfonyl- ethyl}-carbamic acid tert-butyl ester; <BR> <BR> <BR> <BR> {(R)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoy l]-2-phenylmethanesulfonyl- ethyl}-carbamic acid tert-butyl ester; {(R)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoy l]-2-cyclopropylmethanesulfonyl-ethyl}- carbamic acid tert-butyl ester; (R)-1- {1- [hydroxy- (3-phenyl-1, 2,4-oxadiazol-5-yl)-methyl]-propylcarbamoyl}-2-phenylmethane sulfonyl-ethyl)- carbamic acid ter-butyl ester; ( (R)-2-cyclopropylmethanesulfonyl-1- { (S)-1- [ (5-ethyl-1, 2,4-oxadiazol-3-yl)-hydroxy-methyl]- propylcarbamoyl}-ethyl)-carbamic acid tert-butyl ester; { (R)-1- [1- (benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-phenylmet hanesulfonyl-ethyl}-carbamic acid tert-butyl ester; <BR> <BR> <BR> {(R)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-3-phenyl-prop ylcarbarnoyl]-2-cyclopropylmethanesulfonyl- ethyl}-carbamic acid ter-butyl ester; {(R)-1-[(S)-1-(hydroxy-thiazol-2-yl-methyl)-3-phenyl-propylc arbamoyl]-2-phenylmethanesulfonyl-ethyl}- carbamic acid tert-butyl ester; {(R)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoy l]-2-cyclopropylmethanesulfonyl-ethyl}- carbamic acid tert-butyl ester; (R)-1- {1- [hydroxy- (3-phenyl-1, 2,4-oxadiazol-5-yl)-methyl]-propylcarbamoyl}-2-phenylmethane sulfonyl-ethyl)- carbamic acid tert-butyl ester; ((R)-2-cyclopropylmethanesulfonyl-1-{(S)-1-[(5-ethyl-1, 2,4-oxadiazol-3-yl)-hydroxy-methyl]- propylcarbamoyl}-ethyl)-carbamic acid tert-butyl ester; { (R)-1- [1- (benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-phenylmet hanesulfonyl-ethyl}-carbamic acid tert-butyl ester; <BR> <BR> <BR> {(R)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-3-phenyl-prop ylcarbamoyl]-2-cyclopropylmethanesulfonyl- ethyl}-carbamic acid tert-butyl ester; {(R)-1-[(S)-1-(hydroxy-thiazol-2-yl-methyl)-3-phenyl-propylc arbamoyl]-2-phenylmethanesulfonyl-ethyl}- carbamic acid tert-butyl ester; (R)-2-phenylmethanesulfonyl-1-{(S)-1-[(3-cyclopropyl-1, 2,4-oxadiazol-5-yl)-hydroxy-methyl]- propylcarbamoyl}-ethyl)-carbamic acid tert-butyl ester; (R)-N- [1- (Benzoxazole-2-carbonyl)-butyl]-2- [cyclopropylmethyl- (tetrahydro-pyran-4-ylmethyl)-amino]-3- phenylmethanesulfonyl-propionamide ; (R)-N- [1- (benzothiazol-2-yl-hydroxy-methyl)-butyl]-2-dibenzylamino-3- phenylmethanesulfonyl-propionamide ;

(R)-N- [1-(benzothiazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethane sulfonyl-2-(tetrahydro-pyran-4-ylamino)- propionamide; (R)-N- [1- (benzothiazol-2-yl-hydroxy-methyl)-butyl]-2-isopropylamino-3 -phenylmethanesulfonyl-propionamide ; (R)-N- [1-(benzothiazol-2-yl-hydroxy-methyl)-butyl]-2-dimethylamino -3-phenylmethanesulfonyl-propionamide ; (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-pheny lmethanesulfonyl-2-(tetrahydro-pyran-4- ylamino)-propionamide ; (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-(1-me thyl-piperidin-4-ylamino)-3- phenylmethanesulfonyl-propionamide ; (R)-N- [(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-(bis-thioph en-2-ylmethyl-amino)-3- phenylmethanesulfonyl-propionamide ; (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-diben zylamino-3-phenylmethanesulfonyl- propionamide; (S)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-(tetr ahydro-pyran-4-ylamino)-3-thiophen-2-yl- propionamide ; S)-N-[(S)-I-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-isopro pylamino-3-thiophen-2-yl-propionamide; (S)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-isopr opylamino-3-phenylmethanesulfonyl- propionamide ; <BR> <BR> <BR> (R)-N- [l- (benzothiazol-2-yl-hydroxy-methy !)-butyt]-3-phenylmethanesulfony]-2- (tetrahydro-pyran-4-ylantino)- propionamide; R)-N- [ (S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesulfo nyl-2- (tetrahydro-pyran-4- ylamino)-propionamide ; (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-pheny lmethanesulfonyl-2-(tetrahydro-pyran-4- ylamino)-propionamide ; (S)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-[(2-m ethoxy-ethyl)-(etrahydro-pyran-4-yl)-amino]-3- phenylmethanesulfonyl-propionamide ; (S)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-cyclo hexylamino-3-phenylmethanesulfonyl- propionamide; (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-dimet hylàmino-3-phenylmethanesulfonyl- propionamide ; N-cyanomethyl-3-cyclohexyl-propionamide ; N-cyanomethyl-3- (2-difluoromethoxy-phenylmethanesulfonyl)-propionamide ; 3- (3-cyclohexyl-propionylamino)-2-oxo-5-phenyl-pentanoic acid thiazol-2-ylamide ; 3-cyclohexyl-N-(1-formyl-3-phenyl-propyl)-propionamide; 3- (2-difluoromethoxy-phenylmethanesulfonyl)-N [ (S)-1- (5-ethyl- [1, 3,4] oxadiazole-2-carbonyl)-propyl]- propionamide; N-[(S)-1-(benzooxazole-2-carbonyl)-propyl]-2-(2-cyano-phenyl amino)-3-cyclohexyl-propionamide; N-Cyanomethyl-3-cyclohexyl-2- (4-methoxy-phenoxy)-propionamide ; 2-benzyloxy-N-cyanomethyl-3-cyclohexyl-propionamide ;

(R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-butyl]-2-benzylo xy-3-phenylmethanesulfonyl- propionamide ; (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-2-methox ymethoxy- 3-phenylmethanesulfonyl-propionamide ; (S)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-butyl]-2-hydroxy -3-phenyl-propionamide ; (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-3-phenyl methanesulfonyl-2- triisopropylsilanyloxy-propionamide ; <BR> <BR> <BR> (R)-N-[(S)-1-(1-benzothiazol-2-yl-methanoyl)-propyl]-2-hydro xy-3-phenylmethanesulfonyl- propionamide; (R)-2-hydroxy-3-phenylmethanesulfonyl-N-[(S)-1-(1-pyridazin- 3-yl-methanoyl)-butyl]- propionamide ; (S)-3-((R)-2-hydroxy-3-phenylmethanesulfonyl-propanoylamino) -2-oXo-pentanoic acid benzylamide; (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-3-[2-(1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionamide ; (R)-N-[(S)-1-(1-benzothiazol-2-yl-methanoyl)-propyl]-3-[2-(1 ,1-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionamide ; (2R, 5 S)-2- [2-(1, 1-difluoro-methoxy)-phenylmethanesulfonylmethyl]-6-ethoxy-5- ethyl- morpholin-3-one; and their corresponding N-oxides, and their prodrugs, and their protected derivatives, individual isomers and mixtures of isomers thereof; and the pharmaceutically acceptable salts and solvates (e. g. hydrates) of such compounds and their N-oxides and their prodrugs, and their protected derivatives, individual isomers and mixtures of isomers thereof.

Pharmacology and Utility: The compounds of the invention are selective inhibitors of cathepsin S and, as such, are useful for treating diseases in which cathepsin S activity contributes to the pathology and/or symptomatology of the disease. For example, the compounds of the invention may be useful in treating autoimmune disorders, including, but not limited to, juvenile onset diabetes, multiple sclerosis, pemphigus vulgaris, Graves'disease, myasthenia gravis, systemic lupus erythemotasus, rheumatoid arthritis and Hashimoto's thyroiditis, allergic disorders, including, but not limited to, asthma, and allogeneic immune responses, including, but not limited to, organ transplants or tissue grafts.

Cathepsin S also is implicated in disorders involving excessive elastolysis, such as

chronic obstructive pulmonary disease (e. g., emphysema), bronchiolitis, excessive airway elastolysis in asthma and bronchitis, pneumonities and cardiovascular disease such as plaque rupture and atheroma. Cathepsin S is implicated in fibril formation and, therefore, inhibitors of cathepsins S are of use in treatment of systemic amyloidosis.

The cysteine protease inhibitory activities of the compounds of the invention can be determined by methods known to those of ordinary skill in the art. Suitable in vitro assays for measuring protease activity and the inhibition thereof by test compounds are known. Typically, the assay measures protease induced hydrolysis of a peptide based substrate. Details of assays for measuring protease inhibitory activity are set forth in ENZYME ASSAY EXAMPLES, infra.

Administration and Pharmaceutical Compositions: In general, compounds of Formula I will be administered in therapeutically effective amounts via any of the usual and acceptable modes known in the art, either singly or in combination with one or more therapeutic agents. A therapeutically effective amount may vary widely depending on the severity of the disease, the age and relative health of the subject, the potency of the compound used and other factors. For example, therapeutically effective amounts of a compound of Formula I may range from about 1 microgram per kilogram body weight (pg/kg) per day to about 60 milligram per kilogram body weight (mg/kg) per day, typically from about 1 pg/kg/day to about 20 mg/kg/day. Therefore, a therapeutically effective amount for a 80 kg human patient may range from about 80, ug/day to about 4.8g/day, typically from about 80 pg/day to about 1.6 g/day. In general. one of ordinary skill in the art, acting in reliance upon personal knowledge and the disclosure of this Application, will be able to ascertain a therapeutically effective amount of a compound of Formula I for treating a given disease.

The compounds of Formula I can be administered as pharmaceutical compositions by one of the following routes: oral, systemic (e. g., transdermal, intranasal or by suppository) or parenteral (e. g., intramuscular, intravenous or subcutaneous). Compositions can take the form of tablets, pills, capsules, semisolids, powders, sustained release formulations, solutions, suspensions, elixirs, aerosols, or any other appropriate composition and are comprised of, in general, a compound of Formula I in combination with at least one pharmaceutically acceptable excipient. Acceptable excipients are non-toxic, aid administration, and do not adversely affect the therapeutic benefit of the active ingredient. Such excipient may be any solid, liquid, semisolid or, in the case of an aerosol composition, gaseous excipient that is generally available to one of skill in the art.

Solid pharmaceutical excipients include starch, cellulose, talc, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, magnesium stearate, sodium stearate, glycerol monostearate, sodium chloride, dried skim milk, and the like. Liquid and semisolid excipients may be selected from water, ethanol, glycerol, propylene glycol and various oils,

including those of petroleum, animal, vegetable or synthetic origin (e. g., peanut oil, soybean oil, mineral oil, sesame oil, and the like). Preferred liquid carriers, particularly for injectable solutions, include water, saline, aqueous dextrose and glycols.

The amount of a compound of Formula I in the composition may vary widely depending upon the type of formulation, size of a unit dosage, kind of excipients and other factors known to those of skill in the art of pharmaceutical sciences. In general, a composition of a compound of Formula I for treating a given disease will comprise from 0.01% w to 10% w, preferably 0.3% w to 1% w, of active ingredient with the remainder being the excipient or excipients. Preferably the pharmaceutical composition is administered in a single unit dosage form for continuous treatment or in a single unit dosage form ad libitum when relief of symptoms is specifically required. Representative pharmaceutical formulations containing a compound of Formula I are described in Example 15, infra.

Chemistry: Processes for Making Compounds of Formula I : Compounds of the invention may be prepared by the application or adaptation of known methods, by which is meant methods used heretofore or described in the literature, for example those described by R. C.

Larock in Comprehensive Organic Transformations, VCH publishers, 1989.

In the reactions described hereinafter it may be necessary to protect reactive functional groups, for example hydroxy, amino, imino, thio or carboxy groups, where these are desired in the final product, to avoid their unwanted participation in the reactions. Conventional protecting groups may be used in accordance with standard practice, for examples see T. W.

Greene and P. G. M. Wuts in"Protective Groups in Organic Chemistry"John Wiley and Sons, 1991.

Compounds of Formula I, where Xl is-NHC (R') (R2) X3, can be prepared by proceeding as in the following Reaction Scheme 1: Reaction Scheme 1

in which each X2, X3, X7, R', R2 and R3 are as defined for Formula I in the Summary of the Invention.

Compounds of Formula I can be prepared by condensing an acid of Formula 11 with an amino compound of formula NH2CRIR2X3. The condensation reaction can be effected with an appropriate coupling agent (e. g., benzotriazol-1-yloxytrispyrrolidinophosphonium hexafluorophosphate (PyBOP@), tetra- methyluroniumhexafluorophosphate (HATU), 1- (3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI), O-benzotriazol-l-yl-N, N, N', N'-tetramethyluronium hexafluorophosphate (HBTU), 1,3-dicyclohexylcarbodiimide (DCC), N-cyclohexylcarbodiimide, N'-methylpolystyrene, or the like) and optionally an appropriate catalyst (e. g., 1-hydroxybenzotriazole (HOBt), 1-hydroxy-7-azabenzotriazole (HOAt), 0- (7-azabenzotrizol-1-yl)-1, 1,3,3,, or the like) and non-nucleophilic base (e. g., triethylamine, N-methylmorpholine, and the like, or any suitable combination thereof) at ambient temperature and requires 5 to 10 hours to complete.

An oxidation step, if required, can be carried out with an oxidizing agent (e. g., Oxone metachloroperbenzoic acid or the like) in a suitable solvent (e. g., methanol, water, or the like, or any suitable combination thereof) at ambient temperature and requires 16 to 24 hours to complete. Detailed descriptions for the synthesis of a compound of Formula I by the processes in Reaction Scheme 1 are set forth in the Examples 1 to 10, infra.

Compounds of Formula I, where Xl is-NHX4, can be prepared by proceeding as in the following Reaction Scheme 2: Reaction Scheme 2

in which each X2, X4, X7 and R3 are as defined for Formula I in the Summary of the Invention.

Compounds of Formula I can be prepared by condensing an acid of Formula II with an amino compound of formula NH2X4. The condensation reaction can be effected with an appropriate coupling agent (e. g., benzotriazol-1-yloxytrispyrrolidinophosphonium hexafluorophosphate (PyBOP@), 0-(7-azabenzotrizol-1- yl)-1, 1,3,3, tetra-methyluroniumhexafluorophosphate (HATU), 1- (3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI), O-benzotriazol-I-yl-N, N, N', N'-tetramethyluronium hexafluorophosphate (HBTU), 1,3-dicyclohexylcarbodiimide (DCC), N-cyclohexylcarbodiimide, N'-methylpolystyrene, or the like) and optionally an appropriate catalyst (e. g., 1-hydroxybenzotriazole (HOBt), 1-hydroxy-7-azabenzotriazole (HOAt), or the like) and non-nucleophilic base (e. g., triethylamine, N-methylmorpholine, and the like, or any suitable combination thereof) at ambient temperature and requires 5 to 10 hours to complete.

An oxidation step, if required, can be carried out with an oxidizing agent (e. g., Oxone metachloroperbenzoic acid or the like) in a suitable solvent (e. g., methanol, water, or the like, or any suitable combination thereof) at ambient temperature and requires 16 to 24 hours to complete.

Compounds of Formula I in which X2 is-OR4, can be prepared by reacting a compound of Formula 3 with a compound of Formula R4L according to the following reaction scheme: Reaction Scheme 3

in which L is a leaving group and X', R3 and R4 are as defined in the Summary of the Invention. A detailed description for the synthesis of a compound of Formula I by the process described above is set forth in Example 4, infra.

Compounds of Formula I, in which X2 is -NHR15, can be prepared by reacting a compound of Formula 4 with a compound of Formula Rl5L according to the following reaction scheme : Reaction Scheme 4

in which L is a leaving group and X', R3 and R'5 are as defined in the Summary of the Invention. A detailed description for the synthesis of a compound of Formula I by the process described above is set forth in [update], infra.

Additional Processes for Preparing Compounds of Formula I : A compound of Formula I can be prepared as a pharmaceutically acceptable acid addition salt by reacting the free base form of the compound with a pharmaceutically acceptable inorganic or organic acid. Alternatively, a pharmaceutically acceptable base addition salt of a compound of Formula I can be prepared by reacting the free acid form of the compound with a pharmaceutically acceptable inorganic or organic base. Inorganic and organic acids and bases suitable for the preparation of the pharmaceutically acceptable salts of compounds of Formula I are set forth in the definitions section of this Application.

Alternatively, the salt forms of the compounds of Formula I can be prepared using salts of the starting materials or intermediates.

The free acid or free base forms of the compounds of Formula I can be prepared from the corresponding base addition salt or acid addition salt form. For example, a compound of Formula I in an acid addition salt form can be converted to the corresponding free base by treating with a suitable base (e. g., ammonium hydroxide solution, sodium hydroxide, and the like). A compound of Formula I in a base addition salt form can be converted to the corresponding free acid by treating with a suitable acid (e. g., hydrochloric acid, etc).

The N-oxides of compounds of Formula I can be prepared by methods known to those of ordinary skill in the art. For example, N-oxides can be prepared by treating an unoxidized form of the compound of Formula I with an oxidizing agent (e. g., trifluoroperacetic acid, permaleic acid, perbenzoic acid, peracetic acid, meta-chloroperoxybenzoic acid, or the like) in a suitable inert organic solvent (e. g., a halogenated hydrocarbon such as dichloromethane) at approximately 0°C. Alternatively, the N-oxides of the compounds of Formula I can be prepared from the N-oxide of an appropriate starting material.

Compounds of Formula I in unoxidized form can be prepared from N-oxides of compounds of Formula I by treating with a reducing agent (e. g., sulfur, sulfur dioxide, triphenyl phosphine, lithium borohydride, sodium borohydride, phosphorus trichloride, tribromide, or the like) in an suitable inert organic solvent (e. g., acetonitrile, ethanol, aqueous dioxane, or the like) at 0 to 80°C.

Prodrug derivatives of the compounds of Formula I can be prepared by methods known to those of ordinary skill in the art (e. g., for further details see Saulnier et al. (1994), Bioorganic and Medicinal Chemistry Letters, Vol. 4, p. 1985). For example, appropriate prodrugs can be prepared by reacting a non-derivatized compound of Formula I with a

suitable carbamylating agent (e. g., 1, 1-acyloxyalkylcarbonochloridate, para-nitrophenyl carbonate, or the like).

Protected derivatives of the compounds of Formula I can be made by means known to those of ordinary skill in the art. A detailed description of the techniques applicable to the creation of protecting groups and their removal can be found in T. W. Greene, Protecting Groups in Organic Synthesis, 3rd edition, John Wiley & Sons, Inc. 1999.

Compounds of the present invention may be conveniently prepared, or formed during the process of the invention, as solvates (e. g. hydrates). Hydrates of compounds of the present invention may be conveniently prepared by recrystallisation from an aqueous/organic solvent mixture, using organic solvents such as dioxin, tetrahydrofuran or methanol.

Compounds of Formula I can be prepared as their individual stereoisomers by reacting a racemic mixture of the compound with an optically active resolving agent to form a pair of diastereoisomeric compounds, separating the diastereomers and recovering the optically pure enantiomer. While resolution of enantiomers can be carried out using covalent diasteromeric derivatives of compounds of Formula I, dissociable complexes are preferred (e. g., crystalline diastereoisomeric salts). Diastereomers have distinct physical properties (e. g., melting points, boiling points, solubilities, reactivity, etc.) and can be readily separated by taking advantage of these dissimilarities. The diastereomers can be separated by chromatography or, preferably, by separation/resolution techniques based upon differences in solubility. The optically pure enantiomer is then recovered, along with the resolving agent, by any practical means that would not result in racemization. A more detailed description of the techniques applicable to the resolution of stereoisomers of compounds from their racemic mixture can be found in Jean Jacques Andre Collet, Samuel H. Wilen, Enantiomers, Racemates and Resolutions, John Wiley & Sons, Inc. (1981).

In summary, the compounds of Formula I are made by a process which comprises: (A) reacting a compound of Formula II : with a compound of the formula NHZCR'RzX3, in which X3, R', R2, R3 and R4 are as defined in the Summary of the Invention for Formula I; or (B) reacting a compound of Formula II with a compound of the formula NH2X4, in which X4, R3 and R4 are as defined in the Summary of the Invention for Formula I; or (C) reacting a compound of Formula 3:

with a compound of formula R4L, in which Xl, R3 and R4 are as defined in the Summary of the Invention and L is a leaving group; or (D) reacting a compound of Formula 4: with a compound of formula R'5L, in which X' ; R'and R4 are as defined in the Summary of the Invention and L is a leaving group; and (E) optionally converting a compound of Formula I into a pharmaceutically acceptable salt; (F) optionally converting a salt form of a compound of Formula I to non-salt form; (G) optionally converting an unoxidized form of a compound of Formula I into a pharmaceutically acceptable N-oxide ; (H) optionally converting an N-oxide form of a compound of Formula I its unoxidized form; (1) optionally resolving an individual isomer of a compound of Formula I from a mixture of isomers; (J) optionally converting a non-derivatized compound of Formula I into a pharmaceutically prodrug derivative ; and (K) optionally converting a prodrug derivative of a compound of Formula I to its non-derivatized form.

Examples: The present invention is further exemplified, but not limited by, the following examples that illustrate the preparation of compounds of Formula I and II (Examples) and intermediates (References) according to the invention.

LC/MS-Procedures : LC/MS (Method A): Mass Spectrometer (MS)-LCT Time-of-Flight (Micromass UK Ltd) Serial No. KA014

Ionization Mode: Electrospray (Positive Ion) Scan: Tof MS (Full Scan m/z 100-1200, sum for 0.4 s @ 50us/scan) Centroid Mode Liquid Chromatograph (LC): Hewlett Packard HP1100 Series Binary Pump (Serial # US80301343) & Degasser (serial # JP73008973) Mobile Phase: A = Water + 0.05% TFA (trifluoroacetic acid) buffer B = Acetonitrile + 0.05% TFA buffer Gradient: 5% B to 100% B in 5 minutes Column: Hypersil BDS C-18,3u, 4.6mm x 50mm Reverse Phase Injection volume: 5 uL Flow rate: lml/min to column & to UV detector, flow split after UV detector such that 0.75ml/min to ELS detector and 0.25ml/min to mass spectrometer.

Auxiliary Detectors: (i) Hewlett Packard Model HP1100 Series UV detector (serial # JP73704703) wavelength = 220nm (ii) Sedere (France) Model SEDEX 75 Evaporative Light Scattering (ELS) detector (serial # 9970002A) temperature--46 deg C, Nitrogen pressure = 4bar Autosampler/Injector: Gilson Model 215 Liquid Handler with Model 819 injection valve (serial # 259E8280) LC/MS (Method B): Same as method A, but with a different gradient: 5% B to 90% B in 3 minutes, 90% B to 100% B in 2 min LC/MS (Method C): Mass Spectrometer (MS)-LCT Time-of-Flight (Micromass UK Ltd) Serial No. KA014 Ionization Mode: Electrospray (Positive Ion) Scan: Tof MS (Full Scan m/z 100-1200, sum for 0.4 s @ 50us/scan) Centroid Mode Liquid Chromatograph (LC): Hewlett Packard HP1100 Series Binary Pump (Serial # US80301343) & Degasser (serial # JP73008973) Mobile Phase: A = Water + 0. 1 % formic acid buffer B = Acetonitrile + 0. 1% formic acid buffer Gradient: 5% B to 90% B in 3 minutes, 90% B to 100% B in 2 min

Column: Phenomenex Synergi C-18,2u, 4. mm x 20mm Reverse Phase Injection volume: 5 uL Flow rate: lml/min to column & to UV detector, flow split after UV detector such that 0.75ml/min to ELS detector and 0.25ml/min to mass spectrometer.

Auxiliary Detectors: (i) Hewlett Packard Model HP 1100 Series UV detector (serial # JP73704703) wavelength = 220nm (ii) Sedere (France) Model SEDEX 75 Evaporative Light Scattering (ELS) detector (serial # 9970002A) temperature = 46 deg C, Nitrogen pressure = 4bar Autosampler/Injector: Gilson Model 215 Liquid Handler with Model 819 injection valve (serial # 259E8280) REFERENCE EXAMPLE 1 (a) (R)-3- [2- (1, 1-Difluoro-methoxv)-phenylmethanesulfonvll-2-hydroxy-propion ic acid A solution of (R)-2-tert-Butoxycarbonylamino-3- [2- (1, 1-difluoro-methoxy)-phenylmethanesulfonyl]- propionic acid (5. 19g) in CH2CI2 (20mL), was treated with trifluoroacetic acid (20mL) at room temperature. After two hours, the reaction mixture was concentrated under reduced pressure. The white solid obtained was dissolved in 1M H2SO4 (IOOmL) and dioxane (30mL). The solution was cooled to 0°C, NaN02 (1. 95g in 50mL of water) was added with stirring for 1 hour. The reaction mixture was stirred overnight at ambient temperature. The product was then concentrated and extracted with ethyl acetate, dried with anhydrous MgS04, filtered, concentrated and recrystallized from ethyl acetate to yield (R)-3-f2- (l. 1-difluoro-methoxv)-phenvlmethanesulfonvl1-2-hvdroxy- propionic acid (2.36g).

(b) (R !-2-hedroxy-3-phenvlmethanesulfonyl-propionic acid

By proceeding in a manner similar to Reference Example I (a) above but using (R)-2-tert- butoxycarbonylamino-3-[phenylmethanesulfonyl]-propionic acid there was prepared (R)-2-hydroxv-3- phenylmethanesulfonvl-propionic acid.

REFERENCE EXAMPLE 2 (R)-2-Amino-N-methoxy-N-methyl-butyramide To a solution of [ (R)-I- (methoxy-methyl-carbamoyl)-propyl]-carbamic acid tert-butyl ester (4.92g, 20mmol) in CH2Cl2 (20ml) was added TFA (lOmL) at room temperature. After stirring for 2 hours, the reaction mixture was concentrated to dryness under reduced pressure to produce (R)-2-amino-N- methoxy-N-methyl-butyramide TFA salt (5.4g).

REFERENCE EXAMPLE 3 (R)-3- [2-(1,1-Difluoro-methoxy)-phenylmethanesulfonyl]-2-triisopro pylsilanyloxy-propionic acid (R)-3-[2-(1,1-difluoro-methoxy)-phenylmethanesulfonyl]-2-hyd roxy-propionic acid (7. 0g, 22.58mmol), in CH2CI2 (50mL) was reacted with 2,6-lutidine (12. 09g, 112. 9mmol) and triisopropylsilyl-trifluoro-methanesulfonate (20.75g, 67.74mmol) at-78°C for one hour. The reaction mixture was allowed to warm to room temperature before being quenched by the addition of saturated ammonium chloride solution. The product was extracted with ethyl acetate, the solvent was removed under reduced pressure and the oil residue was then dissolved in EtOH: THF: H20 (3: 1: 1,60mL). Solid K2CO3 (24g) was added at room temperature and the mixture was stirred for one hour, filtered, extracted with ethyl acetate, dried with anhydrous MgS04, filtered and concentrated to yield R-3-2- (I, 1-Difluoro-methoxy)-phenylmethanesulfon]-2-triisopropylsilan yloxy-propionic acid (8. 58g).

Following as in reference 3 provided the following intermediate : (R)-3-Phenvlmethanesulfonyl-2-triisopropvlsilanyv-propionic acid REFERENCE EXAMPLE 4 3- [2-(1*1-Difluoro-methoxv)-phenYlmethanesulfonyll-propionic acid

A mixture of [2- (1, 1-difluoro-methoxy)-phenyl]-methanethiol (190mg,. l. Ommol), acrylic acid (69µL, l. Ommol), diisopropylethylamine (440 pL, l. lmmol) and 0. 5mL dimethylformamide was stirred at 45°C for 4 hours. Diethyl ether (5mL) and IN HCl (2mL) was added. The layers were separated and the organic layer was washed with IN HCI (2mL), dried over MgS04 and concentrated.

The resulting oil was dissolved in methanol (5mL), treated with an aqueous solution (5mL) of OxoneM) (921mg, 1. 5mmol), and stirred for 1 hour. Methanol was removed under reduced pressure and 20mL water was added. The mixture was extracted with two 60mL portions of ethyl acetate, dried over MgS04 and concentrated to give 3-f2- (1, 1-difluoro-methoxv)-phenylmethanesulfony]-propionic acid (160mg; 0.54mmol, 54% yield).

REFERENCE EXAMPLE 5 3-Benzvlsulfanyl-2- (2-nitro-phenylamino)-propionic acid S-benzylcysteine (1.06g, 5. 0mmol), 2-fluoronitrobenzene (1. 05mL, lO. Ommol), potassium carbonate (1. 38g, 10.0mmol) and dimethylformamide (3mL) were combined and stirred at 100°C for 4 hours. The mixture was diluted with 40mL water and washed with two 15mL portions of diethyl ether. The aqueous layer was acidified to pH 4 with 6N HCI and extracted with two 30mL portions of ethyl acetate. The ethyl acetate layer was dried over MgS04, and concentrated. Diethyl ether was added and then decanted to give 3-benzvlsulfanyl-2- (2-nitro-phenvlamino)-propionic acid (541mg, 1.63mmol, 33% yield).

REFERENCE EXAMPLE 6 (R)-3-Benzvlsulfany5-nitro-thiazol-2-vlamino)-propionic acid S-benzylcysteine (0.845g, 4mmol) and bis (trimethylsilyl) acetamide (3mL, 16mmol) were stirred at 75°C for 1 hour. 2-Bromo-5-nitrothiazole (837mg, 4mmol) and toluene (8mL) was added and the mixture was stirred at 100°C for 1 day. Toluene was removed under reduced pressure. The residue was stirred in 5mL dioxane and 5mL IN HCI for 30 minutes. Dioxane was removed under reduced pressure and the mixture was basified with saturated NaHC03 and washed with 50mL ethyl acetate.

The aqueous layer was acidified with 6N HCI and extracted with two 25mL portions of ethyl acetate, dried over MgS04, concentrated and chromatographed using a gradient of 5-10% methanol in methylene chloride to yield (R)-3-benzylsulfanyl-2-(5-nitro-thiazol-2-ylamino)-propionic acid (42.7mg, 0.123mmol, 3% yield).

REFERENCE EXAMPLE 7 (2S)-4, 4-Difluoro-2-hvdroxy-5-phenyl-pentanoic acid

To a suspension of (S)-2-Amino-4,4-difluoro-5-phenyl-pentanoic acid (1.0 mmol, 230mg) in water (3mL) was added 2M sulfuric acid dropwise until the solid dissolved (ca 3mL). A solution of sodium nitrite (1.5 eq., 1.5 mmol, 104mg) in 1 ml of water was then added dropwise. The mixture was stirred at room temperature for 21 hours then extracted twice with ether (30 ml). The organic layers were dried over MgS04 and then concentrated in vacuum to afford (2S !-4, 4-difluoro-2-hedroxv-5-phenyl- pentanoic acid (90 mg, 39%) as a white solid.'H NMR (CDCl3) 7.3 (m, 5H), 5.6 (b, 1H), 4.61 (dd, J=8.5,2.9 Hz, 1H), 3.3 (t, J=16. 8 Hz, 2H), 2.45 (m, 1H), 2. 2 (m, 2H).

REFERENCE EXAMPLE 8 2-(S)-(2-Morpholin-4-yl-2"oxo-ethoxv !-4-phenyl-butvric acid Step (i) : To a cooled (0°C) solution of ethyl (2R) 2-hydroxy-4-phenylbutyrate (1. 81g, 8.71 mmol), 4-nitro-benzoic acid (l. leq., 9.56 mmol, 1.598g) and triphenyl phosphine (1. 1 eq., 9.5 mmol, 2. 50g) in dry THF (80mL) under nitrogen was added slowly diethyl azodicarboxylate (1. 1 eq., 9.56 mmol, 1. 67g). The mixture was stirred at 0°C for 2.5 hours and then concentrated in vacuum. The residue was triturated with a mixture of ethyl acetate and heptane (1: 3,150mL) and the resulting solids were filtered off. The filtrate was concentrated in vacuum and purified over 110g silica gel, eluting with a mixture of ethyl acetate and heptane (1 : 4, v/v) to afford 4-nitro-benzoic acid (S)-l-ethoxycarbonyl-3- phenyl-propyl ester (3.4g, 98%).

Step (ii): To a cooled (0°C) solution of 4-nitro-benzoic acid (S)-1-ethoxycarbonyl-3-phenyl-propyl ester (2.04 g, 5.83 mmol) in MeOH (30 mL) was added potassium carbonate (1.5 eq., 8.75 mmol, 1.21g). The mixture was stirred at 0°C for 5 minutes then at room temperature for 1.5 hours and concentrated in vacuum. The residue was partitioned between water (40mL) and ethyl acetate (40mL).

The organic layer was dried over MgS04 and then concentrated in vacuum. The residue was purified

over 35g silica gel, eluted with dichloromethane to afford methyl- (2S)-2-hydroxy-4-phenyl-butyrate as a colorless oil (933mg, 82%).

Step (iii): To a solution of methyl- (2S)-2-hydroxy-4-phenyl-butyrate (300mg, 1.54 mmol) in dry DMF (3mL) under nitrogen was added sodium hydride (60%, 1.5 eq., 2.32 mmol, 92.7mg). After 5 min, 4- (2-chloroacetyl) morpholine (1. 1 eq., 1.69 mmol, 277mg) was added and the mixture was stirred at room temperature for 24 hours, then diluted with water (60mL) and then neutralized with 1 N HCI.

The aqueous solution was extracted twice with ethyl acetate (40mL). The organic layer was washed with water (50mL), dried over MgS04 and then concentrated in vacuum. The residue was purified over 35g silica gel, eluting with ethyl acetate then with 5% MeOH in ethyl acetate to afford (S)-2- (2- morpholin-4-yl-2-oxo-ethoxy)-4-phenyl-butyric acid methyl ester (117mg, 24%).

Step (iv) : To a solution of (S)-2- (2-morpholin-4-yl-2-oxo-ethoxy)-4-phenyl-butyric acid methyl ester (117mg, 0. 36 mmol) in MeOH : H20 (2: 1 vol, 3mL) was added lithium hydroxide hydrate (2.0 eq., 0.73 mmol, 30.5mg). The mixture was stirred at room temperature for 5 hours, then diluted with water (30mL) and then extracted with ether (30mL). The aqueous layer was acidified with IN HCI and extracted twice with ether (30mL). The acidic extracts were dried over MgS04 and then concentrated in vacuum to afford (S)-2- (2-Morpholin-4-yl-2-oxo-ethoxy)-4-phenyl-bu ic acid (85. 5mg, 77%) as a colorless oil.'H NMR (CDCI3) 10.5 (b, 1H), 7.2 (m, 5H), 4.55 (d, J=15.2 Hz, 1H), 4.14 (d, J=15. 2 Hz, 1H), 3.9 (dd, J=7.6,4.2 Hz, 1H), 4.6 (m, 6H), 3.4 (m, 2H), 2.8 (m, 2H), 2.3 (m, 1H), 2.15 (m, 1H).

LC/MS 96% (M+1) 308.

REFERENCE EXAMPLE 9 (2S)-2-Fluoro-4-phenvl-butvric acid Step (i): To a cooled (0°C) solution of methyl- (2R)-2-hydroxy-4-phenyl-butyrate (1. 00g, 4.80 mmol) in dry dichloromethane (3mL) was added DAST (3.0eq., 14.4 mmol, 2.32g). The mixture was stirred at room temperature for 18 hours then diluted with dichloromethane (20mL) and carefully quenched with saturated sodium bicarbonate (150mL). The aqueous layer was extracted with dichloromethane (30mL) and the organic layers were dried over MgS04 and then concentrated in vacuo. The residue

was purified over 90g silica gel, eluting with a mixture of dichloromethane and heptane (1: 2 then 1: 1, v/v) to afford methyl-2S-fluoro-4-phenyl-butyrate as a light yellow oil (578 mg, 57%).

Step (ii): To a solution of methyl-2S-fluoro-4-phenyl-butyrate (577mg, 2.74 mmol) in a mixture of MeOH: H20 (2: 1 vol, 6mL) was added lithium hydroxide monohydrate (1. 5 eq., 4.11 mmol, 173mg).

The mixture was stirred at room temperature for 5 hours and then concentrated in vacuum. The residue was diluted with water (30mL) and extracted with ether (20mL). The aqueous layer was acidified with HCI and extracted with ether (30mL). The acidic extract was dried over MgS04 and then concentrated in vacuum to afford 2 (S)-fluoro-4-phenyl-butvric acid as a yellow oil (486 mg, 97%).'H NMR (CDC13) 7.5 (b, 1H), 7.3 (m, 5H), 4.95 (ddd, J=48.9,6.9,5.4 Hz, 1H), 2.85 (m, 2H), 2.25 (m, 2H). MS (CI) M+1 183.

REFERENCE EXAMPLE 10 2 (R !-Methoxv4-phenvl-buteric acid Step 1: To a solution of ethyl- (2R)-2-hydroxy-4-phenyl-butyrate (500mg, 2.40 mmol) in dry DMF (4mL) under nitrogen was added sodium hydride (60%, 2.0 eq., 4.80 mmol, 192mg) followed by methyl iodide (3.0 eq., 7.20 mmol, 1. 02g). The mixture was stirred at room temperature for 22 hours, then diluted with NH4CI (lOOmL) and extracted with ethyl acetate (50mL). The organic layer was dried over MgS04 and then concentrated in vacuum. The residue was purified over 35g silica gel, eluting with ethyl acetate and heptane (1: 3, v/v) to afford (R)-2-methoxy-4-phenyl-butyric acid ethyl ester (480 mg, 90%).

Step 2: To a solution of (R)-2-methoxy-4-phenyl-butyric acid ethyl ester (480mg, 2.8 mmol) in MeOH: H20 (2: 1 vol, 9mL) was added lithium hydroxide hydrate (2.0 eq., 4.32 mmol, 181mg). The mixture was stirred at room temperature for 2.5 hours, then diluted with water (20mL) and then extracted with ether (20mL). The aqueous layer was acidified with IN HCI and then extracted twice with ether (30 mL). The combined extracts were dried over MgS04 and then concentrated in vacuum to afford 2 (R)-methoxy-4-phenyl-butyric acid (426mg, quant.) as a colorless solid.'H NMR (CDCI3) 7.25 (m, 5H), 3.8 (dd, J=6.8,5.2 Hz, 1H), 3.48 (s, 3H), 2.78 (t, J=7. 3 Hz, 2H), 2.1 (m, 2H). MS (CI) M 194.

Following as in reference 10 but using benzyl bromide in step 2 provided the following intermediate: 2 (R)-Benzyloxy-4-phenyl-butvric acid REFERENCE EXAMPLE 11 (a) (R)-2-Amino-N- [1- (benzothiazol-2-vl-hvdroxy-methyl)-butyll-3-phenvlmethanesul fonyl- propionamide

A solution of { (R)-1- [1- (benzothiazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2- phenylmethanesulfonyl-ethyl}-carbamic acid tert-butyl ester {888mg, 1.58mmol, Example 27 (a)} in dichloromethane (5mL) was treated with trifluoroacetic acid (5mL). The mixture was stirred at room temperature for one hour and then evaporated. The residue was dissolved in dichloromethane (20mL.) and this solution was treated with Silicycle Triamine (4.3g, 16mmol). The mixture was stirred at room temperature for two hours and then filtered. The filtrate was evaporated to give the title compound (692mg, 94%). LC/MS m/z=562 (M+H).

(b) (S)-2-Amino-N- [ (S)-l- (benzoxazol-2-vl-hvdroxy-methvl)-butvll-3-thiophen-2-yl- propionamide

By proceeding in a manner similar to Reference Example 11 (a) above but using {(S)-1-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-thiophen- 2-yl-ethyl}-carbamic acid tert-butyl ester {790mg, 1.67mmol, Example 27 (c)} and subjecting the reaction product to flash chromatography on silica eluting with a mixture of ethyl acetate and methanol (9: 1, v/v) there was prepared tau-2- amino-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-thi ophen-2-yl-propionamide (415mg, 66%). LC/MS m/z=374 (M+H).

(c) (R)-2-Amino-N- [(S)-l- (benzoxazol-2-yl-hydroxv-methyl)-butvll-3-phenvlmethanesulfo nvl- propionamide

By proceeding in a manner similar to Reference Example 1 l (a) above but using {(R)-1-[(S)-1- (Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-phenylmet hanesulfonyl-ethyl}-carbamic acid tert-butyl ester {908mg, 1.66mmol, Example 27 (b)} there was prepared (R)-2-amino-N-r (S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesulfo nyl-propionamide (726mg, 98%).

LC/MS m/z=446 (M+H).

(d) (R)-2-Amino-N-[1-(benzothiazol-2-yl-hydroxy-methyl)-butyl]-3 -phenylmethanesulfonyl- propionamide By proceeding in a manner similar to Reference Example 11 (a) above but using {(R)-1-[1- (Benzothiazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-phenylm ethanesulfonyl-ethyl}-carbamic acid tert-butyl ester {0. 63mmol, Example 27 (d)} there was prepared (R)-2-Amino-N-[1-(benzothiazol-2-yl- hvdroxy-methyl)-butyl]-3-phenylmethanesulfonyl-propionamide (212mg, 73%). LC/MS m/z=462 (M+H).

(e) (R)-2-Amino-N- [(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmetha nesulfonyl- propionamide

By proceeding in a manner similar to Reference Example 11 (a) above but using {(R)-1-[(S)-1- (Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-phenylmet hanesulfonyl-ethyl}-carbamic acid tert-butyl ester {1. 7mmol, Example 27 (e)} there was prepared (R)-2-amino-N-[(S)-1-(benzoxazol-2- yl-hydroxy-methyl)-butyl]-3-phenylmethanesulfonyl-propionami de (726mg, 98%). LC/MS m/z=446 (M+H).

(f) (R)-2-Amino-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl] -3- cyclopropvlmethanesulfbnyl-propionamide By proceeding in a manner similar to Reference Example 11 (a) above but using {(R)-1-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-cycloprop ylmethanesulfonyl-ethyl}-carbamic acid tert-butyl ester {450mg, 0. 88mmol, Example 27 (f)} there was prepared (R)-2-amino-N- [ (S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-cvclopropvlmethane sulfonyl-propionamide (360mg, 0.879mmol, 100%).

LC/MS m/z=410 (M+H) (g) (R)-2-Amino-N-{1-[hydroxy-(3-phenyl-1,2,4-oxadiazol-5-yl)-me thyl]-propyl}-3- phenvlmethanesulfonyl-propionamide

By proceeding in a manner similar to Reference Example 1 l (a) above but using (R)-1- {1- [Hydroxy- (3-phenyl-1, 2,4-oxadiazol-5-yl)-methyl]-propylcarbamoyl}-2-phenylmethane sulfonyl-ethyl)-carbamic acid tert-butyl ester {Example 27 (g)} there was prepared (R)-2-amino-N-{1-[hydroxy-(3-phenyl-1, 2,4- oxadiazol-5-yl)-methyl]-propyl}-3-phenylmethanesulfonyl-prop ionamide. LC/MS m/z=481 (M+Na), 459 (M+H) (h) (R)-2-Amino-3-cvclopropylmethanesulfonvl-N-f (S)-l- [ (5-ethvl-1, 2,4-oxadiazol-3-yl)- hydroxy-methyl]-propyl}-propionamide By proceeding in a manner similar to Reference Example 11 (a) above but using ( (R)-2- cyclopropylmethanesulfonyl-1-{(S)-1-[(5-ethyl-1,2,4-oxadiazo l-3-yl)-hydroxy-methyl]- propylcarbamoyl}-ethyl)-carbamic acid tert-butyl ester {Example 27 (i)} there was prepared R)-2- amino-3-cyclopropvlmethanesulfonvl-N- S)-l- [ (5-ethyl-1, 2, 4-oxadiazol-3-vl)-hydroxv-methvl]- propvl-propionamide. LC/MS m/z=375 (M+H) (i) (R)-2-Amino-N-[1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-p henylmethanesulfonyl- propionamide

By proceeding in a manner similar to Reference Example 1 l (a) above but using { (R)-1- [1- (Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-phenylmet hanesulfonyl-ethyl}-carbamic acid tert-butyl ester {Example 27 (j)} there was prepared (R)-2-Amino-N- [1- (benzoxazol-2-yl-hvdroxy_ methvl)-butvn-3-phenvlmethanesulfonyt-propionamide. LC/MS m/z=446 (M+H) (j) (R)-2-Amino-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-3-phen yl-propyl]-3- cyclopropylmethanesulfonyl-propionamide

By proceeding in a manner similar to Reference Example 11 (a) above but using {(R)-1-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-3-phenyl-propylcarbamoyl]-2 -cyclopropylmethanesulfonyl-ethyl}- carbamic acid tert-butyl ester {Example 27 (k)} there was prepared (R)-2-amino-N- !-1-(benzoxazol- 2-yl-hydroxy-methyl)-3-phenyl-propvl]-3-cvclopropylmethanesu lfonyl-propionamide. LC/MS m/z=472 (M+H) (k) (R)-2-Amino-N-[(S)-1-(hydroxy-thiazol-2-yl-methyl)-3-phenyl- propyl]-3- phenylmethanesulfonyl-propionamide

By proceeding in a manner similar to Reference Example 11 (a) above but using {(R)-1-[(S)-1- (Hydroxy-thiazol-2-yl-methyl)-3-phenyl-propylcarbamoyl]-2-ph enylmethanesulfonyl-ethyl}-carbamic acid tert-butyl ester {Example 27 (1)} there was prepared (R)-2-amino-N- [fS)-l-fhydroxy-thiazol-2-yl- methyl)-3-phenyl-propyl]-3-phenylmethanesulfonyl-propionamid e.

(1) (R)-2-Amino-3-phenylmethanesulfonyl-N-{(S)-1-[(3-cyclopropyl -1,2,4-oxadiazol-5-yl)- hydroxy-methyl]-propyl}-propionamide

By proceeding in a manner similar to Reference Example 1 l (a) above but using ( (R)-2- phenylmethanesulfonyl-1-{(S)-1-[(3-cyclopropyl-1,2,4-oxadiaz ol-5-yl)-hydroxy-methyl]- propylcarbamoyl}-ethyl)-carbamic acid tert-butyl ester {Example 27 (s)} there was prepared R-2- amino-3-phenylmethanesulfonyl-N-{ (S)-1-f (3-cyclopropvl-1, 2,4-oxadiazol-5-vl)-hydroxy-mell- propyl}-propionamide.

(m) 2-amino-1-(5-ethyl-[1,3,4]oxadiazol-2-yl-butan-1-ol

By proceeding in a manner similar to Reference Example 11 (a) above but using {1-[(5-ethyl- [1, 3,4] oxadiazol-2-yl)-hydroxy-methyl]-propyl}-carbamic acid ter-butyl ester (Reference Example 16) there was prepared 2-amino-1- (5-ethyl- [1, 3, 41oxadiazol-2-yl-butan-1-ol.

REFERENCE EXAMPLE 12 f (S)-l- (Hvdroxy-thiazol-2-yl-methyl)-3-phenyI-propyl]-carbamic acid ter-butyl ester

n-Butyllithium (4.2ml, 10.5mmol, 2.5M solution in hexanes) was mixed with 16ml diethylether and the resulting solution cooled to-78°C. 2-Bromothiazole (1.64g, lOmmol) was dissolved in a mixture of 2ml diethylether and lml THF. This solution was added dropwise to the n-butyllithium solution.

The resulting reaction mixture was stirred for 15min. A solution of [(S)-1-(Methoxy-methyl- carbamoyl)-3-phenyl-propyl]-carbamic acid tert-butyl ester (1.4g, 4.3mmol) in 20ml THF was added dropwise to the reaction mixture. Stirring was continued for one hour and the reaction mixture quenched by addition of 50ml water. After warming to room temperature the phases were separated and the aqueous phase extracted with ethyl acetate. The combined organic phases were washed with brine and dried with magnesium sulfate. The solvents were evaporated under vacuum to give 1.4g [ (S)- 3-Phenyl-1- (thiazole-2-carbonyl)-propyl]-carbamic acid tert-butyl ester as a brown solid, [(S)-3-Phenyl-l-(thiazole-2-carbonyl)-propyl]-carbamic acid tert-butyl ester (1.41g, 4.1mmol) was dissolved in 50 ml ethanol and the solution cooled to 0°C. Sodium borohydride (155mg, 4. lmmol) was added and the reaction mixture stirred for 90 minutes. Water was added and the aqueous phase acidified by addition of 1M hydrochloric acid. The aqueous phase was extracted with ethyl acetate.

The combined organic phases were washed with brine and dried with magnesium sulfate. The solvent was evaporated under reduced pressure. (1.32,3.8mmol, 88%). LC/MS m/z=271 (M+H-isobutene), 249 (M+H-boc) REFERENCE EXAMPLE 13 (S)-2-Amino-4-phenyl-1-thiazol-2-vl-butan-1-ol [ (S)-l- (Hydroxy-thiazol-2-yl-methyl)-3-phenyl-propyl]-carbamic acid tert-butyl ester (1.32g, 3.8mmol, Reference Example 12) was dissolved in lOml dichloromethane. Trifluoroacetic acid was added and the resulting reaction mixture stirred for two hours. The solvents were evaporated under

reduced pressure and saturated sodium bicarbonate solution was added. The solution was extracted with ethyl acetate. The combined organic phases were washed with brine and dried with magnesium sulfate. The solvent was evaporated and the crude product purified via flash chromatography (eluted with ethyl acetate followed by 10% methanol in ethyl acetate) to give (S)-2-amino-4-phenyl-l-thiazol- 2-yl-butan-1-ol (466mg, 1.87mmol, 49%). LC/MS m/z=249 (M+H).

REFERENCE EXAMPLE 14 (S)-2-Amino-l- (3-cyclopropyl-1, 2,4-oxadiazol-5-yl)-butan-l-ol A solution of boc-3S-amino-2-hydroxypentanoic acid (2.00g, 8.57mmol) and 1.20 equivalents of cyclopropanecarboxamidoxime (1.03g, 10.29mmol) in 20 mL of dichloromethane was stirred at 0°C as 1.25 equivalents of N-cyclohexylcarbodiimide-N'-methyl polystyrene (1.70mmol/g, 6.30g, 10.72mmol) was added in portions and the reaction mixture stirred under nitrogen for three hours while warming to 15°C. The reaction mixture was filtered and the resin washed with dichloromethane.

Evaporate under vacuum to dryness. [LC/MS m/z=338 (M+H+Na)] The residue is dissolved in 20 mL of tetrahydrofuran and heated in a microwave reactor at 160°C for three minutes. Evaporate under vacuum to dryness. [LC/MS m/z=320 (M+H+Na)] The residue is dissolved in 50 mL of dichloromethane and stirred at room temperature as a 50 mL solution of 50% trifluoroacetic acid in dichloromethane was added dropwise. After three hours the reaction was evaporated under vacuum to dryness and dissolved in 50 mL of dichloromethane again. Three equivalents of Silicycle triamine-3 was added and the mixture stirred at room temperature overnight. The mixture was filtered and washed with dichloromethane. Evaporate under vacuum to give (S !-2-Amino-1-(3-cyclopropyl-1, 2, 4- oxadiazol-5-v)-butan-1-ol 1. 04g (61% overall). [LC/MS m/z=198 (M+H)] REFERENCE EXAMPLE 15 Ethyl-1, 3, 4-oxadiazole: A mixture of the formic hydrazide (60g, lmole), triethylorthopropionate (176.26g, lmole) and p-toluenesulfonic acid (250mg) was heated at 120°C for 12 hours. The ethanol was removed under vacuum and the residue was distilled under vacuum to yield 24g of ethyl-1, 3,4-oxadiazole. H'NMR (DMSO-8) : 9.34 (1H, s), 2.86 (2H, q), 1. 25 (3H, t).

REFERENCE EXAMPLE 16 {1- [ (5-Ethyl- [1, 3, 4] oxadiazol-2-yl)-h droxy-methyll-propyl}-carbamic acid tert-butyl ester

To a stirred solution of the ethyl-1, 3,4-oxadiazole (4.66g, 48mmol, Reference Example 15) in THF (50ml) was added n-BuLi (1.6M solution in 30ml of hexane) drop-wise under N2 at-78°C. After 1 hour, MgBr#Et2O (12. 38g, 48mmol) was added and the reaction mixture was allowed to warm to -45°C for 1 hour before being treated with 2-Boc-Nlu-aldehyde (3.2g, 24mmol) in THF (20ml). The reaction mixture was stirred for 1 hour, quenched with saturated NH4CI, and extracted with ethyl acetate. The organic layer was washed with brine, dried with MgS04 and concentrated. The residue was purified by silica gel column chromatography to yield {l-f (5-ethyl- [U. 4] oxadiazoI-2-vl)- hydroxy-methyll-propylT-carbamic acid test-butyl ester (2. 13g),1NMR (DMSO-#) : 6.65,6.52 (1H, d, d, J=9.2Hz, J=9.2Hz, NH, diastereomer), 6.14,5.95 (1H, d, d, J=5.6Hz, J=5.6Hz, OH, diastereomer), 4.758,4.467 (1H, m, diastereomer), 3.7-3.55 (1H, m), 2.8 (2H, q), 1.33 (12H, t), 1.25-1.21 (2H, m), 0.82 (3H, m). MS: 284.1 (M-1), 286 (M+1), 308 (M+Na).

REFERENCE EXAMPLE 17 (a) (S) 2-Amino-1-benzooxazol-2-yl-butan-i-ol Step 1. Benzoxazole (600 mg, 5 mmol) in 20 ml THF was cooled to-5°C and isopropyl magnesium chloride (2M in THF, 2.5 ml, 5 mmol) was added. After stirring for 1 hour at-5°C, (S)-(1-formyl- propyl)-carbamic acid tert-butyl ester {561 mg, 3 mmol, Reference Example 18 (a)}, prepared as in reference 15, in 10 ml THF was added. The reaction was allowed to warm to room temperature with stirring for 2 hours. The reaction was quenched with saturated ammonium chloride solution, excess THF solvent removed. The residue was extracted with EtOAc, washed with brine, dried with anhydrous MgS04, filtered and concentrated. The crude residue was purified by chromatograph to yield 688 mg product (75%); LC-MS: 305.2 (M-l), 307.0 (M+1).

Step 2. (S)-[1-(Benzooxazol-2-yl-hydroxy-methyl)-propyl]-carbamic acid tert-butyl ester (275mg, 0.89mmol) and MeCl2 (5ml) were mixed and TFA (1ml) was added at room temperature. After stirring for 1 hour, the solvent and excess TFA were removed under vacuum to produce 260mg of (S)- 2-amino-l-benzooxazol-2-yl-butan-l-ol TFA salt.

(b) (S)-2-Amino-1-benzothiazol-2-yl-butan-1-ol

By proceeding in a similar manner to Example 17 (a) but using benzothiazole in Step 1 there was prepared (S)-2-amino-l-benzothiazol-2-yl-butan-l-ol TFA salt.

(c) (S)-2-amino-1-benzooxazol-2-yl-pentan-1-ol

By proceeding in a similar manner to Example 17 (a) but using (S)- (l-formyl-butyl)-carbamic acid tert- butyl ester {561 mg, 3 mmol, Reference Example 18 (b)} in Step 1 there was prepared (S)-2-amino-l- benzooxazol-2-yl-pentan-1-ol.

(d) 2-amino-1-benzothiazol-2-yl-pentan-1-ol

By proceeding in a similar manner to Example 17 (a) but using benzothiazole and (S)- (l-formyl- butyl)-carbamic acid tert-butyl ester {561 mg, 3 mmol, Reference Example 18 (b)} in Step 1 there was prepared 2-amino-1-benzothiazol-2-yl-pentan-1-ol.

REFERENCE EXAMPLE 18 (a) (S)-Formyl-propyl)-carbamic acid tert-butyl ester (S)- (+)-2-amino-l-butanol (50g, 561mmol) in 200ml of water and 200ml dioxane was cooled to 0°C and mixed with NaOH (26.9g, 673mmol) and di-t-butyl-dicarbonate (146.96 g, 673mmol).

After the addition, the reaction was allowed to warm to room temperature. The reaction mixture was stirred for 2 hours. After removing the dioxane, the residue was extracted with EtOAc, then washed with brine and dried with anhydrous MgS04, filtered and concentrated. Without further purification, the crude product (120g) was used for next step reaction.

A solution of oxylyl chloride (40.39 g, 265mmol) in 700ml of MeC12 was stirred and cooled to -60°C. Dimethylsulfoxide (51.7 g, 663mmol) in 100 ml of MeCI2 was added drop wise. After 10

minutes a solution of (S)-2-boc-amino-1-butanol (50 g, 265 mmol) in 100ml of MeC12 was added drop wise at-70°C. The reaction mixture was allowed to warm to-40°C for 10 minutes and then cooled to - 70°C again. A solution of triethylamine (74.9 g, 742mmol) in 100 ml of MeCl2 was added. The reaction mixture was allowed to warm to room temperature over 2 hours. 100mls of saturated sodium dihydrogen phosphate was added, and then the organic layer was washed with brine and dried over MgS04. The solvent was removed to yield 45g of (S)- (l-formvl-propyl)-carbamic acid tert-butvl ester : H'NMR (DMSO-8) : 9.4 (1H, s), 7.29 (1H, br.), 3.72 (1H, m), 1. 69 (2H, m), 1.4-1.2 (9H, s), 0.86 (3H, t).

(b) By proceeding in a similar manner to Reference Example 18 (a) but using (S)- (+)-2-amino-1- pentanol there was prepared (S)- (1-formyl-butyl)-carbamic acid tert-butyl ester.

REFERENCE EXAMPLE 19 (S)-3-Amino-2-hydroxy-pentanoic acid benzylamide Stepl. (IS)- (2-Cyano-l-ethyl-2-hydroxyethyl) carbamic acid tert-butyl ester (lOg, 46.7mmol) was dissolved in 1,4-dioxane (lOOmL). Anisole (5mL) was added and then concentrated HCI (lOOmL).

The mixture was heated under reflux for 24 hours. The mixture was evaporated to dryness under vacuum and re-dissolved in lOOmL water. The solution was washed with ether and then neutralized with saturated aqueous NaHCO3. Di-tert-butyl dicarbonate (lOg, 46mmol) was added with 1,4- dioxane (200mL), and the mixture was stirred at ambient temperature for 24 hours. The dioxane was removed under vacuum and the remaining aqueous solution was washed with ether. The solution was acidified with IN HCI and extracted with ethyl acetate. The combined organic layers were washed with brine, dried with magnesium sulfate and evaporated to yield 3-tert-Butoxycarbonylamino-2- hydroxy-pentanoic acid (4.5g) as yellowish oil.

Step 2.3-tert-Butoxycarbonylamino-2-hydroxy-pentanoic acid (300mg, 1.29mmol) was combined with EDC (400mg, 2. 1mmol) and HOBt (400mg, 2.6mmol). A solution of benzylamine (0.22mL) and 4-methylmorpholine (0. 5mL) in dichloromethyl (4mL) was added in one portion. The mixture was stirred at ambient temperature for 2 hours. After dilution with ethyl acetate (150mL), the solution was washed with IN aqueous HCI, water, saturated aqueous NaHC03 solution and brine. The resultant mixture was dried with magnesium sulfate and evaporated under vacuum to yield (S)-3-amino-2- hydroxy-pentanoic acid benzylamide (380mg) as a white solid.

Step 3. (S)-3-Amino-2-hydroxy-pentanoic acid benzylamide was dissolved in a mixture of TFA/dichloromethyl (1: 1; 6mL), stirred for 1 hour and evaporated to dryness. (3S)-3-Amino-2- hydroxy-pentanoic acid benzylamide was obtained as the TFA salt and used without further purification.

REFERENCE EXAMPLE 20 (S)-2-Amino-1-oxazoloF45-b] pyridin-2-yl-butan-1-ol Step 1. A mixture of 2-amino-3-hydroxy pyridine (25g, 227mmol), triethylorthoformate (75ml) and p- toluenesulfonic acid (61mg) was heated at 140°C for 8 hours. Excess triethylorthoformate was removed under vacuum. The product was crystallized from ethyl acetate to yield 22.5g of pyridyloxazole; H'NMR (DMSO-8) : 9.26 (1H, s), 8.78 (1H, d), 8.45 (1H, d), 7.7 (1H, dd); MS: 120.8 (M+1).

Step 2. Pyridyloxazole (600 mg, 5 mmol) in 30 ml THF was cooled to 0°C before the addition of isopropanyl magnesium chloride (2M in THF, 2.5 ml, 5 mmol). After stirring for 1 hour at 0°C, (S)- (1-formyl-propyl)-carbamic acid tert-butyl ester (573 mg, 3 mmol, Reference Example 18) in 20 ml THF was added. The ice bath was removed and the reaction allowed to warm to room temperature.

The reaction mixture was stirred for 2 hours and quenched with saturated ammonium chloride solution.

Excess THF was removed and the residue was extracted with EtOAc, washed with brine, dried with anhydrous MgS04, filtered and concentrated. The crude residue was purified by chromatography to yield fl-(hoxv-oxazolo[4,5-b]pvridin-2-yl-methyl)-propvl]-carbamic acidtert-but l ester (383 mg) H'NMR (DMSO-8) : 8.42 (1H, m), 8.18 (1H, m), 7.3 (1H, m), 6.8,6.6 (1H, dd, d, OH, diastereomeric), 6.3,6.02 (1H, d, d, NH, diastereomeric), 4.82,4.5 (1H, m, m, diastereomeric), 1.8-1.3 (2H, m), 1.2, 1.05 (9H, s, s, diastereomeric), 0.89 (3H, m); MS: 306.2 (M-1), 308.6 (M+1).

Step 3. To a stirred solution of the [1-(hydroxy-oxazolo [4,5-b] pyridin-2-yl-methyl)-propyl]-carbamic acid tert-butyl ester (12g, lOOmmol) in THF (300ml) was added n-BuLi (1.6M solution in 62.5ml of hexane) drop wise under N2 at-78°C. After 1 hour, MgBr. Et20 (25.8g, 100mmol) was added and the reaction mixture was allowed to warm to-45°C for 1 hour before being treated with 2-boc-amino- butyl-aldehyde (11. 46g, 60mmol) in THF (50ml). The reaction mixture was stirred for 1 hour, quenched with saturated NH4CI, and extracted with ethyl acetate. The organic layer was washed with brine, dried with MgS04 and concentrated. The residue was purified by silica gel column chromatography to yield 2-boc-amino-l-t5-pyndyloxazole-2-yl)-l-butanol (14. 1g).

Step 4. 2-Boc-amino-1-(5-pyridyloxazole-2-yl)-1-butanol (311mg, 1mmol) and MeCI2 (5ml) were mixed and TFA (1ml) was added at room temperature. After stirring for 1 hour, the solvent and excess TFA were removed under vacuum to produce 355mg of 2-amino-1-oxazolo [4. 5-b]pyridin-2-yl-butan- 1-0l TFA salt.

REFERENCE EXAMPLE 21 (S)-2-Amino-l- (3-phenyl-[1,2,4]oxadiazol-5-yl)-butan-1-ol

3-tert-Butoxycarbonylamino-2-hydroxy-pentanoic acid (500mg, 2. 14mmol) was combined with EDC (600mg, 3.14mmol), HOBt (600mg, 3.92mmol), and N-hydroxy-benzamidine (292mg, 2.14mmol). Dichloromethyl (lOmL) was added and then 4-methylmorpholine (ImL). The mixture was stirred at ambient temperature for 16 hours. After dilution with ethyl acetate (200mL), the solution was washed with water (30mL), saturated aqueous NaHC03 solution and brine, dried with MgS04 and evaporated under vacuum. The crude product was dissolved in pymidine (IOmL) and heated at 80°C for 15 hours. The pyridine was evaporated under vacuum and the residue was purified by flash chromatography on silica gel (eluent: ethyl acetate) to yield 290mg (0.83mmol). The oxadiazole (145mg, 0.41mmol) was dissolved in CH2CI2 (4mL) and TFA (4mL) was added. After stirring for 1 hour, the mixture was evaporated to dryness to yield (S)-2-Amino-1-(3-phenyl- [1,2,4]oxadiazol-5-yl)-butan-1-ol.

REFERENCE EXAMPLE 22 (R)-2-tert-butoxycarbonylamino-3-cyclopropylmethanesulfonvl- propionic acid

Step 1. Sodium hydroxide (2.16g, 54mmol) was dissolved in 27ml water and the solution added to a suspension of (R)-2-tert-butoxycarbonylamino-3-mercapto-propionic acid (8.2g, 37mmol) in 54ml methanol. After a clear solution had formed bromomethyl-cyclopropane (5g, 37mmol) was added and the resulting reaction mixture stirred for three days. Methanol was removed under reduced pressure.

The residue was treated with 200ml 1M hydrochloric acid and then extracted three times with 200ml of dichloromethane. The combined organic phases were washed with brine and dried with magnesium sulfate. The solvent was evaporated under reduced pressure to give 2-tert-butoxycarbonylamino-3- cyclopropylmethylsulfanyl-propionic acid (7.94g).

Step 2. Sodium hydroxide (2. 32g, 58mmol) was dissolved in 75ml water. 2-tert- butoxycarbonylamino-3-cyclopropylmethylsulfanyl-propionic acid (7.94g, 29mmol) was added. A solution of Oxone in 100ml water was added slowly. The pH was adjusted to 3 by addition of sodium bicarbonate and the reaction mixture stirred for 30 minutes. It was extracted three times with 200ml ethyl acetate. The combined organic phases were washed with 100m ! brine and dried with magnesium sulfate. The solvent was removed to yield (R)-2-tert-butoxycarbonylamino-3- cyclopropylmethanesulfonyl-propionic acid (4.64g, 15mmol, 31%).

REFERENCE EXAMPLE 23 (S)-2-Amino-1- (5-ethyl-1, 2, 4-oxadiazol-3-yl)-butan-1-ol trifluoro-acetic acid salt Step 1. A solution of (2-Cyano-1-ethyl-2-hydroxy-ethyl)-carbamic acid tert-butyl ester (1,9.53g, 44 mmol) in methanol (80 ml) was cooled to 0°C and treated successively with hydroxylamine hydrochloride (3.05,44 mmol) in methanol (80 ml) and 25% sodium methoxide solution in methanol (10.2 ml). Stirred at 0° C for 5 min., cold bath removed and the reaction mixture stirred at room temperature for 5hr. Methanol evaporated off under reduced pressure, crude partitioned between ethyl acetate and water. Organic layer separated, dried (MgS04) and evaporated under reduced pressure to give yellow oil. Purified by mplc eluting with a mixture of ethyl acetate-heptane to give { (S)-l- [Hydroxy-(N !-hydroxycarbamimidoyl)-methyl]-propyl}-carbamic acid tert-butyl ester as white solid (3.5 g). MS: M (H+) 248.

Step 2. A mixture of {(S)-1-[Hydroxy-(N !-hydroxycarbamimidoyl)-methyl]-propyl}-carbamic acid tert-butyl ester (525 mg, 2.16 mmol), propionic anhydride (0.3 ml, 2.37 mmol) in dioxane (5ml) was heated at 150° C in a microwave (Smith Creator, S00219) for 35min. Crude evaporated under reduced pressure and purified by flash column chromatography to give {(S)-1-[(5-Ethyl-1, 2,4-oxadiazol-3-yl)- hydroxy-methyl]-propyl}-carbamic acid tert-butyl ester as yellow solid (0.8g, 67%).

Hl NMR (CDCI3) : 4.88-4.80 (2H, m), 4.01-3.84 (1H, 2 broad m), 3.64-3.45 (1H, 2 bs), 2.95-2.86 (2H, dq, J=4. 2Hz, 7.6Hz), 1.73-1.62 (1H, m), 1.6-1.32 (13H, m), 1.02-0.94 (3H, q, J=7.5Hz). MS:

304 (M+1) Step. 3. {(S)-1-[(5-Ethyl-1, 2,4-oxadiazol-3-yl)-hydroxy-methyl]-propyl}-carbamic acid tert-butyl ester (214 mg, 0.75 mmol) in dichloromethane (3 ml)) was treated with trifluor acetic acid at room temperature for 3h. Solvent evaporated under reduced pressure to give (S)-2-Amino-1- (5-ethyl-1, 2,4- oxadiazol-3-yl)-butan-1-ol trifluoro-acetic acid salt as brown oil (0.3 g). H'NMR (CDC13) : 7.9- 7.4 (3H, 2bs), 5.07 & 5.24 (1H, 2 x d, J=3.5Hz & 5. 5Hz), 3.8-3.6 (1H, 2 bs), 2.96-2.87 (2H, dq, J=2.4Hz, 7.5Hz), 1.8-1.4 (2H, m), 1.40-1.34 (3H, dt, J=1. 4Hz, 7.5Hz), 1.06-0.98 (3H, dt, J=7.5Hz, 10. 5Hz).

MS: 186 (M+1) EXAMPLE 1 (a) (R)-N-cvanomethyl-2-hydroxv-3-phenylmethanesulfonyl-propiona mide, (Compound 4) DMF (5mL) was added to a mixture of 2-hydroxy-3-phenylmethanesulfonyl-propionic acid [200mg, 0.82mmol, Reference Example l (b)], EDC (300mg, 1.57mmol), HOBt (300mg, 1. 96mmol) and aminoacetonitrile hydrochloride (200mg, 2. lmmol). 4-Methylmorpholine (0. 5mL) was added and the mixture was stirred at ambient temperature for 2 hours. The mixture was diluted with ethyl acetate (200mL), washed with IN HCI, brine, saturated aqueous NaHCO3 solution, and brine, dried with MgS04 and evaporated under vacuum. (R ! methanesu ! fbnvl- propionamide was crystallized from ethyl acetate/hexane to yield 154mg (0. 55mmol) ;'H NMR: (DMSO) 8.89-8.77 (m, 1H), 7. 46-7.37 (m, 5H), 6.71-6.62 (m, 1H), 4.60-4.45 (m, 3H), 4.17-4.08 (m, 2H), 3.39-3.28 (m, 2H). MS: (M++1) 283. <BR> <BR> <P>(b) (R (1-cyano-1-thiophen-2-yl-methl)-2-hydry-3-phenrlmethanesulfo nyl-propionamide, (Compound 7);

By proceeding in a manner similar to Example 1 (a) above but using (R)-2-hydroxy-3- phenylmethanesulfonyl-propionic acid [Reference Example l (b)] and DL-a-amino-2-thiopheneacetic acid there was prepared (R)-N- (1-cyano-1-thiophen-2-yl-methyl)-2-hydroxy-3-phenylmethanesu lfonyl- propionamide.'H NMR (DMSO): 9.55 (d, J=6.5Hz, 1H), 7.58 (d, J=5. 21Hz, 1H), 7.42-7. 39 (m, 5H), 7.23 (m, 1H), 7.05 (dd, J=3.51Hz, J=5.21Hz, 1H), 6.58 (dd, J=3.45Hz, J=6. 66Hz, 1H), 6.41 (s, 1H), 4.59- 4.50 (m, 3H), 3.29 (s, 2H); MS: 362.6 (M-'), 365 (M+').

(c) (R)-N (1-cvano-1-thiophen-2-yl-methvl)-3- [2- (1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionamide, (Compound 8) By proceeding in a manner similar to Example I (a) above but using (R)-3- [2- (1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionic acid [Reference Example l (a)] and DL-a-amino-2- thiopheneacetic acid there was prepared (R (1-cyao-1-thiophen-2-yl-methyl)-3-[2-(1,1-difluoro- methoxy)-phenylmethanesulfonyl]-2-hydroxy-propionamide.'HNMR (CD3C1) : S 7.6-7.2 (m, 7H), 7.01 (t, J=73.6Hz, 1H), 6.62 (s, 1H), 6.21 (d, J=8.15,1H), 4.71-4.67 (m, 1H), 4.46 (s, 2H), 3.68 (s, 2H), 3. 22-3.18 (m, 1H) ; MS: 428.6 (M-1), 453 (M+23).

(d) (R)-N-cyanomethyl-3-[2-(1,1-difluoro-methoxy)-phenylmethanes ulfonyl]-2-hydroxy- propionamide, (Compound 17)

By proceeding in a manner similar to Example l (a) above but using (R)-3- [2- (1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionic acid [Reference Example l (a)] there was prepared (R)- N-cvanomethyl-3-[2-(1 1-difluoro-methoxy)-phenylmethanesulfonvll-2-hydroxy-propion amide.

'HNMR (DMSO): 8.81 (t, J=5.67Hz, 1H), 7.55-7.4 (m, 2H), 7.35-7.2 (m, 2H), 7.13 (t, J=73.68Hz, 1H), 6.62 (d, J=6.67Hz, 1H), 4.58 (s, 2H), 4.52-4.45 (m, 1H), 4.12 (d, J=5.94Hz, 2H), 3.45-3.4 (m, 2H). MS: 347.4 (M-1), 371 (M+23).

EXAMPLE 2 Morpholine-4-carboxylic acid (R)-1-(cyanomethyl-carbamoyl)-2-phenylmethanesulfonyl-ethyl ester, (Compound 6); Phosgene solution (0.77mL, 1.93M in toluene) was added to CH2Cl2 (5mL) and cooled to 0°C under nitrogen. Quinoline (0.12mL, 1. Ommol) was added followed by (R)-N-cyanomethyl-2-hydroxy- 3-phenylmethanesulfonyl-propionamide [lOOmg, 0.354mmol, Example l (a)]. The mixture was stirred at ambient temperature for 3 hours. Morpholine (Immol) was added and stirring was continued for 3 hours. The mixture was diluted with ethyl acetate (200mL) and washed sequentially with IN HCI, brine, saturated aqueous NaHC03 solution and brine. The product was dried with MgS04 and evaporated under vacuum and crystallized from an ethyl acetate/hexane solution to yield morpholine- 4-carboxylic acid (R)-l-Lyanomethyl-carbamovl)-2-phenvlmethanesulfonyl-ethyl ester. (85mg; 0.215mmol) ;'H NMR: (DMSO) 8.99-8.88 (m, 1H), 7.46-7.37 (m, 5H), 5.42-5.32 (m, 1H), 4.60-4.45 (m, 2H), 4.20-4.13 (m, 2H), 3.70-3.28 (m, lOH). MS: (M++1) 396.

EXAMPLE 3 (a) Morpholine-4-carboxvlic acid R)-1-(cyanomethyl-carbamoyl)-2-[2-(1,1-difluoro-methoxy)- phenylmethanesulfonylj-ethyl ester, (Compound 31)

(R)-N-cyanomethyl-3-[2-(1,1-difluoro-methoxy)-phenylmethanes ulfonyl]-2-hydroxy- propionamide [lOOmg, 0.287mmol, Example l (d)], was dissolved in CH2CI2 (2mL). Pyridine (32.4pL, 0.4mmol) and then trichloromethylchloroformate (36.2gel, 0.3mmol) were added. The mixture was stirred at ambient temperature for 3 hours. Morpholine (0. 5mL) was added and stirring was continued for 3 hours. The mixture was diluted with ethyl acetate (200mL), washed with 1N HCI, brine, saturated aqueous NaHC03 solution and brine. The product was dried with MgS04, evaporated under vacuum and crystallized from a solution of ethyl acetate/hexane to yield morpholine-4-carboxylic acid (R)-1-(cyanomethyl-carbamoyl)-2-[2-(1,1-difluoro-methoxy)-ph enylmethanesulfonyl]-ethyl ester (60mg; 0.130mmol) ;'H NMR: (DMSO) 6 8.95 (t, J=5.2Hz, 1H), 7.51-7.44 (m, 2H), 7.32-7.22 (m, 2H), 7.14 (t ; JH, F-73Hz, 1H), 5.39-5.35 (m, 1H), 4. 67-4.53 (m, 2H), 4.19-4.15 (m, 2H), 3.83-3.28 (m, IOH) ; MS: (M*'+ 1) 462.

(b) (R)- (2-Methoxv-ethyl)-carbamic acid 1- (cvanomethyl-carbamovl)-2-phenylmethanesulfonyl- ethylester By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-2-hydroxy-3- phenylmethanesulfonyl-propionamide [Example 1 (a)] and 2-methoxyethylamine there was prepared (R)- (2-Methoxv-ethyl)-carbamic acid 1- (cyanomethyl-carbamoyl)-2-phenylmethanesulfonyl-ethyl ester.'H NMR: (DMSO) 8.91 (t, J=5.6Hz, 1H), 7.64 (t, J=5. 6Hz, 1H), 7.40-7.32 (m, 5H), 5.30-5.25 (m, 1H), 4.59-4.50 (m, 2H), 4.17-4.13 (m, 2H), 3.58 (dd, J=9.2Hz, J=14.8Hz, 1H), 3.43 (d, 14.8Hz, 1H), 3.33 (s, 3H), 3.38-3.12 (m, 4H). MS: (M+H) + 384.

(c) (S)-Diethyl-carbamic acid 1-(cvanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and diethylamine there was prepared (S)-Diethyl-carbamic acid 1- (cvanomethyl-carbamoyl)-2-cvclohexvl-ethvl ester.'H NMR: (DMSO) 8.62 (t, J=5.6Hz, 1H), 4.87- 4.82 (m, 1H), 4.12 (d, J=5.6,2H), 3.42-3.10 (m, 4H), 1.72-0.82 (m, 19H). MS: (M+H) + 310.

(d) (S)-Pyrrolidine-1-carboxylinc acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester By proceeding in a manner similar to Example 3 (a) above but using (R)-At-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and pyrrolidine there was prepared (S)-Pyrrolidine-1-carboxylic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester. 1H NMR: (DMSO) 8.59 (t, J=4.8Hz, 1H), 4.86- 4.81 (m, 1H), 4.11 (d, J=4. 8,2H), 3.48-3.19 (m, 4H), 1.87-0.82 (m, 17H). MS: (M+H)+ 308.

(e) (S)-Morpholine-4-carboxylic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and morpholine there was prepared (S)-Morpholine-4-carboxylic acid 1- (cvanomethvl-carbamovl)-2-cyclohexvl-eth l ester.'H NMR : (DMSO) 8.66 (t, J=5.2Hz, 1H), 4.88- 4.83 (m, 1H), 4.13 (d, J=4.8,2H), 3. 60-3.26 (m, 8H), 1.71-0.82 (m, 13H). MS: (M+H) + 324.

(S)-4-Ethyl-piperazine-1-carboxylic acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and 4-ethylpiperazine there was prepared (S)-4-Ethvl-piperazine-1- carboxylic acid 1- (cyanomethyl-carbamovl)-2-cvclohexyl-ethyl ester. LC-MS: elution time = 2.08min. 349.2 (M-1), 351.3 (M+1). (MS: API 150EX. LC: HP Agilent 1100 Series. Column: Phenomenex, 5u ODS3 100A 100X3mm. ; Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0. 1% AcOH. Solvent B, 99% actonitrile, 1% water, 0. 1%AcOH.

Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.).

(g) (S)-2-Hydroxymethyl-parrolidine-1-carboxylic acid (S)-1- (cyanomethyl-carbamoyl)-2 cyclohexyl-ethylester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and (S)-2-hydroxymethyl-pyrrolidine there was prepared S-2- Hydroxymethyl-pyrrolidine-1-carboxylic acid (S)-1- !-2-cYclohexYl-ethYl ester : LC-MS: elution time = 3. 73min. 336.5 (M-1), 338.2 (M+1). (MS : API 150EX. LC: HP Agilent

1100 Series. Column : Phenomenex, 5u ODS3 100A 100X3mm. ; Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% actonitrile, 1% water, 0. 1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.) (h) (S)- (2, 2, 2-Trifluoro-ethyl)-carbamic acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and 2,2,2-trifluoroethylamine there was prepared (S)- (2, 2, 2-Trifluoro-ethyl) carbamic acid l- (cvanomethvl-carbamovl)-2-cvclohexvl-ethyl ester. LC-MS: elution time = 4.07min.

334.1 (M-1), 336.2 (M+1). (MS: API 150EX. LC: HP Agilent 1100 Series. Column: Phenomenex, 5u ODS3 100A 100X3mm. ; Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% actonitrile, 1% water, 0.1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.) (i) (S)-(2-hydroxyethyl)-carbamic acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and 2-hydroxyethylamine there was prepared (S)- (2-HydroxvethyI)-carbamic acid 1- (cvanomethvl-carbamoyl)-2-cyclohexvl-ethyl ester.'H NMR: (DMSO) 8.65 (t, J=5.2Hz, 1H), 7.16 (t, J=5.2Hz, 1H), 4.85-4.80 (m, 1H), 4.62 (t, J=5.6Hz, 1H), 4.12 (d, J=5.6Hz, 2H), 3.45-3.33 (m, 2H), 3.12-2.96 (m, 2H), 1.74-0.80 (m, 13H). MS: (M+H) + 298.

(j) (Tetrahydrofuran-2-ylmethyl)-carbamic acid (S)-1- (cyanomethvl-carbamoyl)-2-cyclohexyl- ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and tetrahydrofurfurylamine there was prepared (tetrahydrofuran-2- ylmethyl)-carbamic acid (Scyanomethvl-carbamovl)-2-cyclohexyl-ethvl ester as a 1: 1 mixture of diastereomers,'H NMR: (DMSO) 8.66 (t, J=5.2Hz, 1H), 7.28 (t, J=5.2Hz, 1H), 4.864.81 (m, 1H), 4.12 (d, J=5.2Hz, 2H), 3.83-3.54 (m, 3H), 3.09-2.92 (m, 2H), 1.89-0.80 (m, 17H). MS: (M+H) + 338.

(k) (S)-Azetidine-1-carboxylic acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and azetidine there was prepared (S)-azetidine-1-carboxylic acid 1- (cvanomethyl-carbamoyl)-2-cyclohexvl-ethvl ester.'H NMR: (DMSO) 8.59 (t, J=5.2Hz, 1H), 4.82- 4.77 (m, 1H), 4.11 (d, J=5.2Hz, 2H), 4.13-3.81 (m, 4H), 2.18 (quint, J=7.6Hz, 2H), 1.71-0.80 (m, 13H). MS: (M+H) + 294.

(1) (S)vclopropyl-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and cyclopropylamine there was prepared (S)-cyclopropyl-carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester.'H NMR : (DMSO) 8.64 (t, J=5.2Hz, 1H), 7.44 (br, 1H), 4.83-4.78 (m, 1H), 4.11 (d, J=5.2Hz, 2H), 2.50-2.40 (m, 1H), 1.72-0.78 (m, 13H), 0.58-0.30 (m, 4H). MS: (M+H) + 294.

(m) (S)-Piperidine-l-carboxylic acid 1- (cvanomethyl-carbamovl-2-cvclohexyl-ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and piperidin there was prepared (S)-piperidine-1-carboxylic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester.'H NMR : (DMSO) 8.63 (t, J=5.2Hz, 1H), 4.86- 4.81 (m, 1H), 4.11 (d, J=5.6Hz, 2H), 3.48-3.20 (m, 4H), 1.70-0.82 (m, 19H). MS: (M+H) + 322.

(n) (S)- (2-Methoxy-ethyl)-carbamic acid 1- (cvanomethyl-carbamoyl)-2-cyclohexvl-ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and 2-methoxyethylamine there was prepared (S)- (2-methoxy-ethyl)- carbamic acid 1- (cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester.'H NMR: (DMSO) 8.66 (t, J=5.6Hz, 1H), 7.27 (t, J=5.6Hz, 1H), 4.85-4.80 (m, 1H), 4.12 (d, J=5.6Hz, 2H), 3.40-3.03 (m, 4H), 3.32 (s, 3H), 1.74-0.80 (m, 13H). MS: (M+H) + 312. (o) (R)-3-Hydroxy-yrrolidine-1-carboxylic acid (S)- (cyanomethvl-carbamovl)-2-cyclohexyl- ethylester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and (R)-3-hydroxy-pyrrolidine there was prepared (R)-3-hydroxy- pyrrolidine-1-carboxylic acid (S)-l- (cyanomethvl-carbamovl)-2-cvclohexyl-ethyl ester.'H NMR : (DMSO) 8.64-8.56 (m, 1H), 4.98-4.80 (m, 2H), 4.29-4.20 (m, 1H), 4.11 (d, J=5.2Hz, 2H), 3.57-3.12 (m, 4H), 1.91-0.82 (m, 15H). MS: (M+H) + 324.

(p) (S)-3-Hydroxy-pyrrolidine-1-carboxylic acid (S)-l- (cyanomethyl-carbamoyl)-2-cyclohexyl- ethyl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and (S)-3-hydroxy-pyrrolidine there was prepared (S)-3-hydroxy- pyrrolidine-1-carboxylic acid (S)-1- (cvanomethyl-carbamovl)-2-cyclohexvl-ethvl ester.'H NMR.

(DMSO) 8.63-8.55 (m, 1H), 4.98-4.90 (m, 1H), 4.85-4.80 (m, 1H), 4.28-4.19 (m, 1H), 4.13-4.09 (m, 2H), 3.54-3.09 (m, 4H), 1.93-0.81 (m, 15H). MS: (M+H) + 324.

(q) (S !-Morpholine4-carboxelic acid 1- !-3-cvclohexyl-propvl ester

By proceeding in a manner similar to Example 3 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide and morpholine there was prepared (S)-morpholine-4-carboxylic acid 1- (cvanomethvl-carbamol)-3-cyclohexyl-propyl ester.'H NMR: (DMSO) 8.61 (t, J=5.6Hz, 1H), 4.79 (t, J=5.6Hz, 1H), 4.13 (d, J=5.2Hz, 2H), 3.59-3.26 (m, 8H), 1.73-1.55 (m, 7H), 1.23-1.06 (m, 6H), 0.88-0.76 (m, 2H). MS: (M+H) + 338.

EXAMPLE 4 (a) Morpholine-4-carboxylic acid R)-1-f (S-1- (1-benzooxazol-2-yl-methanovl)- propylcarbamoyl]-2-phenylmethanesulfonyl-ethyl ester, (Compound 11)

Step 1. (R)-2-Hydroxy-3-phenylmethanesulfonyl-propionic acid {2g, 8.19mmol, Reference Example 1 (b)} was dissolved in CH2CI2 (20mL). 4-Methylmorpholine (3.8mL) and then chloromethyl methyl ether (1.52mL, 20mmol) were added. After stirring at ambient temperature for 30 minutes, the reaction was quenched with water (50mL) and extracted with ethyl acetate. The combined organic layers were washed with saturated aqueous NaHCO3 solution and brine. The product was dried with MgS04, evaporated under vacuum and crystallized from ethyl acetate/hexane to yield 2-hydroxy-3- phenylmethanesulfonyl-propionic acid methoxymethyl ester (1. 2g; 4. 16mmol).

Step 2. Phosgene solution (2.07mL, 1. 93M in toluene) was added to CH2CI2 (lOmL) and cooled to 0°C under nitrogen. Quinone (0.95mL) was added followed by 2-hydroxy-3-phenylmethanesulfonyl-propionic acid methoxymethyl ester (250mg, 0. 87mm0l). The mixture was stirred at ambient temperature for 3 hours.

Morpholine (0.35mL, 4mmol) was added and stirring was continued for 3 hours. The mixture was diluted with ethyl acetate (200mL), washed sequentially with IN HCI, brine, saturated aqueous NaHC03 solution and brine.

The crude product was dried with MgS04, evaporated under vacuum and dissolved in 1,4-dioxane (20mL). IN HCI (lOmL) was added and the mixture was stirred at ambient temperature for 3 hours. Dioxane was evaporated under vacuum and the product was extracted with ethyl acetate. The combined ethyl acetate layers were washed with saturated aqueous NaHC03 solution (3x20mL). The NaHC03 solution was acidified with 6N HCI and extracted with ethyl acetate. The combined ethyl acetate layers were washed with brine, dried with MgS04 and evaporated under vacuum to give (R)-morpholine-4-carboxvlic acid 1-carboxy-2-phenylmethanesulfonyl-ethyl ester.

Step 3. (R)-Morpholine-4-carboxylic acid 1-carboxy-2-phenylmethanesulfonyl-ethyl ester was combined with EDC (250mg, 1. 3mmol), HOBt (250mg, 1. 6mmol), and (2S)-2-amino-1-benzooxazol-2-yl-butan-1-ol {250mg, 1. 2mmol, Reference Example 17 (a)}. Dichloromethane (4mL) was added and then 4-methylmorpholine (0. 5mL). The mixture was stirred at ambient temperature for 2 hours. After dilution with ethyl acetate (150mL), the solution was washed with IN aqueous HCI, water, saturated aqueous NaHC03 solution and brine, dried with MgS04 and evaporated under vacuum. The crude product was dissolved in dry dichloromethane (1 OmL) and

Dess Martin Periodinane (500mg, 1. 2mmol) was added. After stirring at ambient temperature for 1 hour, the mixture was diluted with ethyl acetate (150mL) and treated with 0.26M Na2S203 solution in saturated aqueous NaHC03. The organic phase was washed with saturated aqueous NaHC03 and brine, dried with MgS04 and evaporated. The product was crystallized from ethyl acetate/hexane to yield morpholine-4-carboxylic acid (R !-1- [(S)-I- (1-benzooxazol-2-yl-methanoyl)-propylcarbamov]-2-phenylmetha nesulfonyl-ethyl ester (190mg ; 0.35mmo !) ;'H NMR: (DMSO) 8.95 (d, J=6.6Hz, 1H), 8.01 (d, J=7.9Hz, 1H), 7.90 (d, J=7.9Hz, 1H), 7.65 (t, J=7.5Hz, 1H), 7.55 (t, J=7.9Hz, 1H), 7.40-7.34 (m, 5H), 5.44-5.35 (m 1H), 5.26-5.16 (m, 1H), 4.60 (d, J=13.6Hz, 1H), 4.47 (d, J=13.6Hz, 1H), 3.71-3.28 (m, lOH), 2.10-1.94 (m, 1H), 1.81-1.65 (m, 1H), 0.98 (t, J=7.2Hz, 3H); MS: (M++1) 544.

(b) Morpholine-4-carboxylic acid LR)-l-r (S)-I- (I-benzooxazol-2-yl-methanoyl) propvlcarbamovll-2- [2- (1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-ethyl ester, (Compound 14) By proceeding in a manner similar to Example 4 (a) above but using (R)-3- [2- (1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionic acid {Reference Example l (a)} in step 1 there was prepared morpholine-4-carboxylic acid (R)-1-[(S)-1-(1-benzooxazol-2-yl-methanoyl)- propylcarbamovl]-2- [2- (l. 1-difluoro-methoxv)-phenylmethanesulfonvl]-ethyl ester'H NMR : (DMSO) 8.95 (d, J=6.4Hz, 1H), 8.01 (d, J=7.9Hz, 1H), 7.90 (d, J=8.4Hz, 1H), 7.65 (t, J=7.4Hz, 1H), 7.54 (t, J=7.5Hz, 1H), 7.52-7.43 (m, 2H), 7.31-7.21 (m, 2H), 7.11 (t, JH, F=73Hz, 1H), 5.43-5.37 (m 1H), 5.27-5.17 (m, 1H), 4.63 (d, J=13.5Hz, 1H), 4.54 (d, J=13.5Hz, 1H), 3.88-3.28 (m, lOH), 2.10- 1.94 (m, 1H), 1.81-1.65 (m, 1H), 0.98 (t, J=7.6Hz, 3H); MS: (M++1) 610.

(c) morpholine-4-carboxylic acid (R)-1-[(S)-1-(1-benzothiazol-2-yl-methanoyl)- propylcarbamovl]-2- [2- (1, 1-difluoro-methoxv)-phenvlmethanesulfonyll-ethyl ester, (Compound 15).

By proceeding in a manner similar to Example 4 (a) above but using (R)-3- [2- (l, l-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionic acid {Reference Example l (a)} in step 1 and (2S)-2- amino-1-benzothiazol-2-yl-butan-1-ol {Reference Example 17 (b)} in step 3 there was prepared morpholine-4-carboxylic acid (R)-1-[(S)-1-(1-benzothiazol-2-yl-methanoyl)-propylcarbamoyl ]-2-[2- (1, 1-difluoro-methoxy)-phenvlmethanesulfonyll-ethvl ester.'H NMR : (DMSO) 8.93 (d, J=6.4Hz, 1H), 8.30-8.24 (m, 2H), 7.72-7.62 (m, 2H), 7.51-7.44 (m, 2H), 7. 32-7. 22 (m, 2H), 7.12 (t, JH, F=73Hz, 1H), 5.49-5.35 (m 2H), 4.64 (d, J=13. 5Hz, 1H), 4.55 (d, J=13. 5Hz, 1H), 3.91-3. 28 (m, lOH), 2.08-1.94 (m, 1H), 1.84-1.68 (m, 1H), 0.99 (t, J=7.6Hz, 3H). MS: (M++1) 626.

(d) Pvrrolidine-1-carboxylic acid (R)-1-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propylcarbamoyl] - 2-phenylmethanesulfonyl-ethyl ester, (Compound 19).

By proceeding in a manner similar to Example 4 (a) above but using pyrrolidine in step 2 there was prepared pYrrolidine-1-carboxvlic acid (R)-1-[(S)-1-(1-benzooxazol-2-yl-methanoyl)- propylcarbamovll-2-phenvlmethanesulfonyl-ethvl.'H NMR: (DMSO) 8.90 (d, J=6.4Hz, 1H), 7.99 (d, J=7.9Hz, 1H), 7.89 (d, J=8.4Hz, 1H), 7.65 (t, J=7. 4Hz, 1H), 7.54 (t, J=7.5Hz, 1H), 7.40-7.33 (m, 5H), 5.41-5.33 (m 1H), 5. 26-5. 15 (m, 1H), 4.59 (d, J=13.5Hz, 1H), 4.47 (d, J=13.5Hz, 1H), 3.66- 3.17 (m, 6H), 2.10-1.64 (m, 6H), 0.97 (t, J=7.2Hz, 3H); MS: (M++1) 528.

(e) Dimethyl-carbamic acid (R)-1-[(S)-1-(1-benzooxazol-2-vl-methanoyl)-propylcarbamoyll -2- phenylmethanesulfonyl-ethyl ester, (Compound 20).

By proceeding in a manner similar to Example 4 (a) above but using dimethylamine in step 2 there was prepared dimethyl-carbamic acid (R)-1-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propylcarbamoyl] - 2-phenylmethanesulfonyl-ethvl ester.'H NMR: (DMSO) 8.91 (d, J=6.4Hz, 1H), 7.99 (d, J=7.9Hz, 1H), 7.90 (d, J=8.4Hz, 1H), 7.65 (t, J=7.4Hz, 1H), 7.54 (t, J=7.5Hz, 1H), 7.40-7.33 (m, 5H), 5.39-5.33 (m 1H), 5.26-5.15 (m, 1H), 4.59 (d, J=13.5Hz, 1H), 4.47 (d, J=13.5Hz, 1H), 3.63 (dd, J=14.8Hz, J=10.6Hz, 1H), 3.42 (dd, J=14.8Hz, J=2. 5Hz, 1H), 2.89 (s, 3H), 2.79 (s, 3H), 2.10-1.94 (m, 1H), 1.81- 1.64 (m, 1H), 0.97 (t, J=7.2Hz, 3H); MS: (M++1) 502.

(f) Morpholine-4-carboxylic acid (R)-1-r (S)-1-f 1-benzvlcarbamovl-methanovl)- propylcarbamovll-2-phenvlmethanesulfonyl-ethyl ester, (Compound 25). By proceeding in a manner similar to Example 4 (a) above but using (R)-3-amino-2-hydroxy-pentanoic acid benzylamide TFA salt (Reference Example 19) in step 3 there was prepared morpholine-4- carboxylic acid fR)-1- [ (S)-1- (1-benzyIcarbamoyl-methanovD-propvlcarbamoyl]-2- phenylmethanesulfonyl-ethyl ester.'H NMR: (DMSO) 9.27 (t, J=5. 5Hz, 1H), 8.67 (d, J=8. 1Hz, 1H), 7.40-7.20 (m, lOH), 5.42-5.34 (m 1H), 4.96-4.85 (m, 1H), 4.64-4.24 (m, 4H), 3.66-3.28 (m, lOH), 1.90-1.72 (m, 1H), 1.63-1.46 (m, 1H), 0.89 (t, J=7.2Hz, 3H); MS: (M++1) 560.

(g) Morpholine-4-carboxylic acid (S)-1-[(S)-1-(oxazolo [45-b] pyridine-2-carbonyl)- propvlcarbamoyl]-2-phenylmethanesulfonvl-ethyl ester

By proceeding in a manner similar to Example 4 (a) above but using (S)-2-amino-1-oxazolo [4, 5- b] pyridin-2-yl-butan-1-ol TFA salt (Reference Example 20) there was prepared morpholine-4- carboxylic acid (S)-l-F (S)-I- (oxazolor4, 5-blpyridine-2-carbonyl)-propylcarbamoyll-2 phenylmethanesulfonyl-ethyl ester. 1H NMR: (DMSO) 9.00 (d, J=6.4Hz, 1H), 8.73 (m, 1H), 8.39 (d, J=8.4Hz, 1H), 7.69-7.64 (m, 1H), 7.45-7.30 (m, 5H), 5.37 (d, J=10.4Hz, 1H), 5.19-5.13 (m, 1H), 4.57 (d, J=13.6Hz, 1H), 4.46 (d, J=13.6Hz, 1H), 3.67-3.23 (m, lOH), 2.10-1.98 (m, 1H), 1.80-1.69 (m, 1H), 0.99 (t, J=7.0Hz, 3H). MS: (M+H) + 545.

(h) Morpholine-4-carboxylic acid (S)-1- [ (S-5-e5-ethyl- [1, 3, 4] oxadiazole-2-carbonvl)- propylcarbamoyll-2-phenylmethanesulfonvl-ethvl ester

By proceeding in a manner similar to Example 4 (a) above but using 2-amino-1-(5-ethyl- [1, 3, 4]oxadiazol-2-yl-butan-1-ol {Reference Example 11 (m)} there was prepared morpholine-4- carboxylic acid (S)-1-[(S)-1-(5-ethyl-[1,3, 4] oxadiazole-2-carbonyi)-propylcarbamovl]-2- phenvlmethanesulfonyl-ethvl ester. 1H NMR : (DMSO) 8.95 (d, J=6. 0Hz, 1H), 7.41-7. 33 (m, 5H), 5.35 (d, J=10, OHz, 1H), 4.97-4.91 (m, 1H), 4.63-4.45 (m, 2H), 3.64-3.23 (m, 10H), 2.96 (q, J=7.2Hz, 2H), 1.99-1.89 (m, 1H), 1.75-1.64 (m, 1H), 1.30 (t, J=7.6Hz, 3H), 0.94 (t, J=7.2Hz, 3H). MS: (M+H) + 523.

EXAMPLE 5 (S)-2-{(R)-3-[2-(1,1-Difluoro-methoxy)-phenylmethanesulfonyl ]-2-hydroxy-propanoylamino}-N- methoxv-N-methvl-butvramide, (Compound 32)

To a solution of (R)-3- [2- (1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-2-hydroxy-propion ic acid {1. 24g, 4mmol, Reference Example 1 (a)} in CH2CI2 (20ml) was added HOBt (0.74g, 4.8mmol), EDC (1.15g, 6mmol), (R)-2-amino-N-methoxy-N-methyl-butyramide TFA salt (1.04g, 4mmol), prepared as in reference 2, and NMM (1.6g, 16mmol). After stirring for 14 hours at room temperature, the

reaction mixture was diluted with 150ml of ethyl acetate. The mixture was washed with saturated NaHCO3 and brine before drying with anhydrous MgS04. This crude product was then filtered, concentrated and purified by flash column chromatography using silica gel with hexane/acetate as eluent to yield (S)-2- (R)-3- [2- (1, 1-difluoro-methoxy)-phenvlmethanesulfonyll-2-hydroxy- propanovlamino}-N-methoxy-N-methvl-butyramide (1.45g); 1HNMR (CD3CI): 7.6-7.5 (d, J=7.67Hz, 1H), 7.5-7.35 (m, 2H), 7.31-7.15 (m, 2H), 6.63 (t, J=73.4Hz, 1H), 5.0-4.85 (br., 1H), 4.7-4.6 (m, 1H), 4.55-4.48 (m, 2H), 4.45-4.35 (m, 1H), 3.80 (s, 3H), 3.6-3.8 (m, 1H), 3.35-3.2 (m, 1H), 1.78 (s, 3H), 2.0- 1.5 (m, 2H), 0.93 (t, J=6.9Hz, 3H); MS: 437.4.4 (M-1), 439.4 (M+1).

EXAMPLE 6 (R)-3-[2-(1,1-Difluoro-methoxy)-phenylmethanesulfonyl]-N-((S )-1-formyl-propyl)2-hydroxy- propionamide. (Compound 23) To a solution of (S)-2-{(R)-3-[2-(1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-2-hydroxy- propanoylamino}-N-methoxy-N-methyl-butyramide (1. 3g, 3mmol, Example 5) in ethyl ether (SOmL) at 0°C under N2, was added IN LAH solution of ethyl ether (3ml). After stirring for 3 hours at 0°C, lml of ethyl acetate and saturated NH4C1 solution was added. The crude product was then extracted with ether, washed with brine, dried with MgS04, filtered and concentrated. The residue was purified by flash column chromatography using silica gel with hexane/acetate as eluent to yield (R)-3- [2- (l. l- difluoro-methoxX)-phenylmethanesulfonyl]-N- ((S)-1-formvl-propvl)-2-hvdroxy-propionamide(0.66g); 'HNMR (DMSO): 9.43 (s, 1H), 8.42 (d, J=7.45Hz, 1H), 7.6-7.0 (m, 4H), 7.12 (t, J=73.93Hz, 1H), 6.52 (d, J=6.45Hz, 1H), 5.2-5.17 (m, 1H), 4.65-4.53 (m, 2H), 4.12-4.0 (m, 1H), 3.63-3.55 (m, 2H), 1.7-1.4 (m, 2H), 0.89 (t, J=6.8Hz, 3H); MS: 378. 2 (M-1), 380.4 (M+1).

EXAMPLE 7 (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-2-hydrox y-3-phenyl-methanesulfonyl- propionamide, (Compound 5)

Step 1. To a solution of (R)-3-Phenylmethanesulfonyl-2-triisopropylsilanyloxy-propion ic acid {556mg, lmmol, Reference Example 3} in CH2CI2 (lOmL) at room temperature was added HOBt (183mg, 1. 2mmol), EDC (288mg, 15mmol), (S)-2-Amino-1-benzooxazol-2-yl-butanol (206mg, lmml) and NMM (202mg, 2mmol). The mixture was then stirred overnight at room temperature before being diluted with ethyl acetate (lOOmL), washed with saturated NaHC03, brine, dried with anhydrous MgS04, filtered and concentrated. The crude product was then purified by flash column chromatography using silica gel with hexane/acetate as eluent (to yield 180mgs of product). This compound was dissolved in CH2CI2, Dess-Martin Periodinane (196mg, 0.46mmol) was added at room temperature and the mixture was stirred for 2 hours. Saturated Na2S203-NaHCO3 solution (5mL) was added and stirred for a further 30 minute before extraction with ethyl acetate and washing sequentially with saturated NaHCCi solution and brine. The crude product was then dried with anhydrous MgS04, filtered, concentrated and purified by flash column chromatography using silica gel with hexane/acetate as eluent to yield (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-3- phenylmethanesulfonyl-2-triisopropylsilanyloxy-propionamide.

Step 2. (R)-N-[(S)-1-(1-Benzooxazol-2-yl-methanoyl)-propyl]-3-phenyl methanesulfonyl-2- triisopropylsilanyloxy-propionamide (120mg, 0.2mmol), in CH3CN (lOmL), 48% HF/water solution (ImL) were mixed and stirred at room temperature for 16 hours. Saturated NaHC03 solution was added carefully to adjust the pH to between 8 and 9. The product was extracted with ethyl acetate (lOOmL), washed with brine and dried with magnesium sulfate. The solvent was removed and the product crystallized from acetate and hexane to yield (R)-N (S)-1-(1-benzooxazol-2-vl-methanoyl !- propyl]-2-hydroxy-3-phenyl-methanesulfonyl-propionamide as a white solid (85% yield) ; 1H NMR : (DMSO) 8.29 (d, J=7.9Hz, lH), 7.74 (d, J=7.9Hz, 1H), 7.59 (t, J=8. 1Hz, 1H), 7.46-7.35 (m, 7H), 6.52 (d, J=6.6Hz, 1H), 5.084.99 (m, 1H), 4.58-4.47 (m, 3H), 3.35-3.28 (m, 2H), 2.05-1.90 (m, 1H), 1.81- 1.65 (m, 1H), 0.91 (t, J=7.2Hz, 3H); MS: (M++1) 431.

EXAMPLE 8 (a) (S)-3-{3-[2-(1,1-Difluoro-methoxy)-phenylmethanesulfonyl]-pr opanoylamino}-2-oxo- pentanoic acid benzvlamide, (Compound 27)

Step 1. A mixture of (R)-3-amino-2-hydroxy-pentanoic acid benzylamide TFA salt (70mg, 0.22mmol), 3- [2- (1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-propionic acid (64mg, 0.22mmol, Reference Example 19) HOBT (33mg, 0.22mmol), EDC (63mg, 0.325mmol), ImL dichloromethane and N- methyl morpholine (48µL, 0.434mmol). The mixture was allowed to stir 16 hours. The product was extracted into 60mL ethyl acetate and washed with two lOmL portions of 1N HCI, lOmL water, and two lOmL portions of saturated NaHCO3, dried over MgS04 and concentrated to give 105mg of crude (R)-3- {3- [2- ( 1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-propanoylamino}-2 -hydroxy-pentanoic acid benzylamide (0.21mmol, 100% yield).

Step 2. To a ImL dichloromethane solution of 105 mg of (R)-3- {3- [2- (1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-propanoylamino}-2-hydroxy-pentanoic acid benzylamide (G. 21 mmol) was added Dess Martin periodinane (179mg, 0.42 mmol). The mixture was allowed to stir for 16 hours, then 10mL of 0. 26M Na2S203 in saturated NaHC03 was added and the mixture was extracted with two 30mL portions of ethyl acetate and washed with three 15mL portions of saturated NaHCO3. The organic layer was dried over MgS04 and concentrated. The product was purified by silica gel chromatography using 3: 1 hexane: ethyl acetate eluent and crystallized from diethyl ether and hexane to give (S)-3- 3-f2- (l, 1-difluoro-methoxX)-phenylmethanesulfony]-propanoylamino}-2- oxo- pentanoic acid benzvlamide (28mg, 0.054mmol, 26% yield) ;'H NMR : (CDC13) 7.0-7.47 (m, 9H), 6.49 (m, 1H), 6.24 (m, 1H), 5.22 (m, 1H), 4.40 (m, 2H), 4.30 (m, 3H), 3.23 (m, 2H), 2.70 (m, 2H), 2.01 (m, 1H), 1.68 (m, 1H), 0.85 (m, 3H); MS: (M++1) 499.4,496.53.

The following compounds were prepared by the method of Example 8: N-[(S)-1-(1-Bezooxazol-2-yl-methanoyl)-propyl]-3-p2-(1,1-dif luoro-methoxy)- phenvlmethanesulfonyl]-propionamide (Compound 26) ;'H NMR: (CDC13) 7.85 (d, J=7.6Hz, 1H), 7.7- 7.0 (m, 7H), 6.51 (m, 2H), 5.60 (m, 1H), 4.34 (m, 3H), 3.29 (m, 2H), 2.80 (m, 2H), 2.13 (m, 1H), 1.87 (m, 1H), 0.96 (m, 3H); MS: (M++1) 481,480.48; N-[(S)-1-(I-Benzooxazol-2-yl-methanoel)-3-phenyl-propyl]-3-p -tolylmethanesulfonyl-propionamide (Compound 30);'H NMR: (CDC13) 7.9 (m, 1H), 7.62 (m, 1H), 7.56 (td, J=6.9,1.2Hz, 1H), 7.47 (td, J=7.1,1.2Hz, 1H), 7.3-7.1 (m, 9H), 6.47 (d, J=7.7Hz, 1H), 5.71 (m, 1H), 4.22 (s, 2H), 3.20 (m, 2H), 2.71 (m, 4H), 2.47 (m, 1H), 2.33 (s, 3H), 2.21 (m, 1H) ; MS: (M++1) 505.2,504.60.

3-(2-Difluoromethoxy-phenylmethanesulfonyl)-N-(1-ethyl-2,3-d ioxo-3-pyrrolidin-1-yl-propyl)-

propionamide; 3- (2-Difluoromethoxy-phenvlmethanesulfonyl)-N (1-ethyl-3-morpholin-4-yl-2, 3-dioxo-propyl)- propionamide; 3-(2-Difluoromethoxy-phenylmethanesulfonyl)-N-(1-ethyl-2,3-d ioxo-3-piperazin-1-yl-propyl)- propionamide ; 3-(2-Difluoromethoxy-phenylmethanesulfonyl)-N-[3-(1,1-dioxo- 116-thiomorpholin-4-yl)-1-ethyl-2,3- dioxo-propyl]-propionamide ; 3-(2-Difluoromethoxy-phenylmethanesulfonyl)-N-[1-ethyl-3-(4- methyl-sulfonyl-piperazin-1-yl)-2,3- dioxo-propyl]-propionamide; 3- [3- (2-Difluoromethoxy-phenylmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid dimethvlamide ; 3-r3- (2-Difluoromethoxy-phenvlmethanesulfonyl)-propionylamino]-2- oxo-pentanoic acid cvclopentyl- ethyl-amide; 3-r3-2-Difluoromethoxy-phenylmethanesulfonyl)-propionylamino ]-2-oxo-pentanoic acid phenylamide: 3-3- (2-Difluoromethoxv-phenylmethanesulfonvl)-propionylamino]-2- oxo-pentanoic acid pridin-3- ylamide; 3-[3-(2-Difluoromethoxy-phenylmethanesulfonyl)-propionylamin o]-2-oxo-pentanoic acid (tetrahydro- pyran-4-yl)-amide ;<BR> 3- 3- (2-Difluoromethoxy-phenylmethanesulfonvl)-propionvlamino]-2- oxo-pentanoic acid (1-benzoyi- piperidin-4-yl)-amide; and 3-r3- (2-Difluoromethoxv-phenylmethanesulfonvl)-propionvlaminol-2- oxo-pentanoic acid (2-<BR> morpholin-4-yl-ethyl)-amide.

EXAMPLE 9 (R)-N-[(S)-1-(1-Benzooxazol-2-yl-methanoyl)-propyl]-2-(2-nit ro-phenylamino)-3- phenylmethanesulfonyl-propionamide, (Compound 28) Step 1.3-Benzylsulfanyl-2- (2-nitro-phenylamino)-propionic acid (350mg, 1.05 mmol, Reference Example 5) was dissolved in 20mL methanol, treated with a 20mL aqueous solution of Oxone#

(970mg, 0. 12mmol), and stirred for 72 hours. Water (300mL) was added and the precipitate was filtered and dried to give 2-(2-nitro-phenylamino)-3-phenylmethanesulfonyl-propionic acid (215mg, 0.59mmol, 56% yield) Step 2. A mixture of 2- (2-nitro-phenylamino)-3-phenylmethanesulfonyl-propionic acid (215mg, 0.59mmol), HOBT (136mg, 0.148mmol), EDC (408mg, 2.13mmol), (S)-2-amino-1-benzooxazol-2-yl- butanol (122mg, 0.59mmol, {Reference Example 17 (a)}, 2.4mL dichloromethane and N-methyl morpholine (97uL, 0.89mmol) was allowed to stir 16 hours. The product was extracted into 20mL ethyl acetate and washed with three 5mL portions of 1N HCI, and one 30mL portion of saturated NaHCO3, dried over MgS04 and concentrated to give (R)-N-[(S)-1-(1-benzooxazol-2-yl-1-hydroxy- methyl)-propyl]-2- (2-nitro-phenylamino)-3-phenylmethane-sulfonyl-propionamide (223mg, 0. 40mmol, 45% yield).

Step 3. (R)-N [ (S)-1- (1-Benzooxazol-2-yl-1-hydroxy-methyl)-propyl]-2- (2-nitro-phenylamino)-3- phenylmethane-sulfonyl-propionamide (223mg, 0.4mmol) was dissolved in 1. 6mL dichloromethane and treated with Dess Martin periodinane (342mg, 0.80 mmol). The mixture was allowed to stir for 16 hours, then 20mL of 0. 26M Na2S203 in saturated NaHC03 was added and the mixture was extracted with two 30mL portions of ethyl acetate and washed with three 5mL portions of saturated NaHC03.

The organic layer was dried over MgS04 and concentrated. The crude product was dissolved in a minimum amount of hot ethyl acetate and crystallized by addition of dry diethyl ether. This crystallization was repeated to give clean (R)-7V- [ (S)-1- (1-Benzooxazol-2-yl-methanovD-propvl]-2- (2- nitro-phenylamino !-3-phenylmethanesulfonvl-propionamide (97mg, 0.176mmol, 44% yield);'H NMR: (DMSO) 8.67 (m, 1H), 8.12 (m, 1H), 7.81 (m, 1H), 7.65-7.35 (m, 10H), 6.78 (m, 2H), 5.51 (m, 1H), 4.68 (m, 1H), 4.37 (s, 2H), 3.62 (m, 1H), 3.38 (m, 1H), 2.15 (m, 1H), 1.91 (m, 1H), 0.98 (m, 3H); MS : (M++1) 551. 0, 550. 58.

The following compound was prepared by the method of Example 9: N-[1-(Benzooxazole-2-carbonyl)-propYI]-3-phenylmethanesulfon yl-2-(pyrimidin-2-ylamino)- propionamide.

EXAMPLE 10 (R)-N-[(S)-1-(1-Benzooxazol-2-yl-methanoyl)-butyl]-2-(5-nitr o-thiazol-2-ylamino)-3- phenylmethanesulfonyl-propionamide, (Compound 29)

Step 1. A mixture of (R)-3-benzylsulfanyl-2-(5-nitro-thiazol-2-ylamino)-propionic acid (42mgmg, 0.123mmol, Reference Example 6) HOBT (28mg, 0.148mmol), EDC (29mg, 0.148mmol), (S)-2- amino-1-benzooxazol-2-yl-pentan-1-ol {27mg, 0.123mmol, Reference Example 17 (c)}, ImL dichloromethane and N-methyl morpholine (14µL, 0. 123mmol) was allowed to stir for 16 hours. The product was extracted into 60mL ethyl acetate and washed with one 30mL portion of 1N HCI, and one 30mL portion of saturated NaHC03, dried over MgS04 and concentrated to give (R)-N-[(S)-1-(1- benzooxazol-2-yl-1-hydroxy-methyl)-butyl]-3-benzylsulfanyl-2 -(5-nitro-thiazol-2-ylamino)- propionamide (41.8mg, 0.077mmol, 63% yield).

Step 2. (R)-N-[(S)-1-(1-Henzooxazol-2-yl-1-hydroxy-methyl)-butyl]-3- benzylsulfanyl-2-(5-nitro- thiazol-2-ylamino)-propionamide (41.8mg, 0.077mmol) was dissolved in 0. 5mL methanol, treated with a 0. 5mL aqueous solution of Oxone# (43mg, 0.069mmol), and stirred for 1 hour. Methanol was removed under reduced pressure and 2mL water was added. The mixture was extracted with two lOmL portions of ethyl acetate, dried over MgS04, and concentrated. It was then dissolved in 0. 5mL dichloromethane and treated with Dess Martin periodinane (65mg, 0.154 mmol). The mixture was allowed to stir for 16 hours, then SmL of 0. 26M Na2S203 in saturated NaHC03 was added and the mixture was extracted with two lOmL portions of ethyl acetate and washed with three 5mL portions of saturated NaHC03. The organic layer was dried over MgS04 and concentrated. The product was purified by triturating with diethyl ether to give (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanyl)-butyl]- 2- (5-nitro-thiazol-2-ylamino)-3-phenylmethanesulfonyl-propiona mide (28mg, 054mmol, 26% yield); 'H NMR: (CDCI3) 7.96 (s, 1H), 7.87 (m, 1H), 7.7-7.3 (m, 9H), 5.57 (m, 1H), 5.06 (m, 1H), 4.47 (m, 2H), 3.75 (m, 1H), 3.48 (m, 1H), 2.09 (m, 1H), 1.85 (m, 1H), 1.43 (m, 1H), 1.24 (m, 1H), 0.94 (m, 3H); MS: (M++1) 572.2,571.63.

EXAMPLE 11 (a) (2S) (4,4-Difluoro-2-hvdroxv-5-phenyl-pentanoic acid (l (S)-cvano-3-phenyl-propyl)-amide, (Compound 33)

To a mixture of amino-acetonitrile hydrochloride (0. 37 mmol, 72.6mg), (2S)-4,4-difluoro-2-hydroxy- 5-phenyl-pentanoic acid (1.0 eq., 0.37 mmol, 85. 0mg, Reference Example 7) and N, N-diispropylethylamine (2.2 eq., 0.81 mmol, 105.2mg) in dry dichloromethane (4 mL) under nitrogen was added PYBOPS (1.1 eq., 0.41 mmol, 212mg). The mixture was stirred at room temperature for 15.5 hours and then concentrated in vacuum. The residue was diluted with ethyl acetate (30ml) and the mixture was washed with water (30mL), then with sodium bicarbonate (30mL) and then with water (30mL). The organic layer was dried over MgS04 and then concentrated in vacuum. The residue was purified over lOg silica gel, eluting with a mixture of ethyl acetate and heptane (1 : 2, v/v) to afford (2S) (4,4-difluoro-2-hydroxn-5-phenyl-pentanoic acid (liSBcyano-3- phenvl-propyl)-amide as a light tan solid (67.4 mg, 48.9%).'H NMR (CDCI3) 7. 3 (m, IOH), 7. 1 (d, J=7 Hz, 1H), 4.8 (q, J=7.4 Hz, 1H), 4.53 (bd, J=9.5 Hz, 1H), 3.2 (dt, J=16.2,4.2 Hz, 2H), 2.96 (s, 1H), 2.85 (m, 2H), 2.5 (m, 1H), 2.3-0.9 (m, 3H). LC/MS 89% parent (M+l).

(b) N- (1 (S)-cyano-3-phenvl-propyl)-2- (S)- (2-morpholin-4-vl-2-oxo-ethoxy)-4.-phenyl-butyramide, (Compound 34) By proceeding in a manner similar to Example I I (a) above but using (S)-2-amino-4-phenyl- butyronitrile hydrochloride and 2- (S)- (2-morpholin-4-yl-2-oxo-ethoxy)-4-phenyl-butyric acid [Reference Example 8] there was prepared N-(1(S)-cyano-3-phenyl-propyl)-2-(S)-(2-morpholin-4-yl- 2-oxo-ethoxy, l-4-phenvl-butvramide as an oil.'H NMR (CDCI3) 9.4 (d, J=8.2 Hz, 1H), 7.3 (m, 10H), 4.75 (q, J=7.5 Hz, 1H), 4.63 (d, J=15.1 Hz, 1H), 3.95 (d, J=15.3 Hz, 1H), 3.87 (dd, J=8.2,3.9 Hz, 1H), 3. 7 (m, 6H), 3. 32 (m, 2H), 2. 85 (m, 4H), 2. 1 (m, 3H), 2. 05 (m, 1H). LC/MS 100% (M+1) 450.

(c) N- (l- (S)-cvano-3-phenvl-propvl)-2- (S)-fluoro-4-phenyl-butyramide, (Compound 35)

By proceeding in a manner similar to Example 11 (a) above but using (S)-2-amino-4-phenyl- butyronitrile hydrochloride and (2S)-2-fluoro4-phenyl-butyric acid (Reference Example 9) there was prepared N- (1- (S)-cyano-3-phenvl-propyl)-2- (S)-fluoro-4-phenvl-butyramide as a light tan solid.'H NMR (CDCl3) 7.3 (m, 10H), 6. 6 (bs, 1H), 4.95 (ddd, J=49.2,8.2,3.5 Hz, 111), 4.8 (m, 1H), 3.8 (m, 4H), 2.3 (m, 1H), 2.2 (m, 3H). MS (CI, M+1) 325 : (d) N-(1-(S)-cyano-3-phenyl-propyl)-2,2-difluoro-4-phenyl-butyra mide, (Compound 36) By proceeding in a manner similar to Example 1 l (a) above but using (S)-2-amino-4-phenyl- butyronitrile hydrochloride and 2,2-difluoro-4-phenyl-butyric acid there was prepared N- (S)-cyano- 3-phenyl-propyl)-2,2-difluoro-4-phenyl-butyramide as a white solid.'H NMR (CDC13) 7.3 (m, 10H), 6.6 (d, J=8.1 Hz, 1H), 4.83 (q, J=7.4 Hz, 1H), 2.88 (dt, J=7.5,2.5 Hz, 2H), 2.79 (t, J=8 Hz, 2H), 2.4 (m, 2H), 2.2 (q, J=7.5 Hz, 2H). LC/MS 50% (M+1) 343.

(e) N- (1- (S)-cyaphenvl-propyl)-2- (S)-hydroxy-4-phenvl-bu amide, (Compound 37)

By proceeding in a manner similar to Example 11 (a) above but using (S)-2-amino-4-phenyl- butyronitrile hydrochloride and (2S)-2-hydroxy-4-phenyl-butyric acid there was prepared N- (1- (S)-cyano-3-phen Ll-propvl)-2- (S)-hvdroxv-4-phenyl-butyramide as a white solid.'H NMR (CDCl3) 7.3 (m, 10H), 6.9 (d, J=8.4 Hz, 1H), 4.86 (q, J=7.4 Hz, 1H), 4.2 (m, 1H), 2.84 (t, J=7.1 Hz, 2H), 2.77 (t, J=7.8 Hz, 2H), 2.5 (d, J=4.7 Hz, H), 2.2 (m, 3H), 1.95 (m, 1H). LC/MS 49% (M+1) 323.

N-(1-(S)-cyano-3-phenyl-propyl)-2-(R)-hydroxy-4-phenyl-butyr amide, (Compound 38)

By proceeding in a manner similar to Example 11 (a) above but using (S)-2-amino-4-phenyl- butyronitrile hydrochloride and (2R)-2-hydroxy-4-phenyl-butyric acid there was prepared N-(1-(S)- cyano-3-phenvl-propyl)-2- (R)-hv-4-phenyl-butvramide as a white solid.'H NMR (CDC13) 7.4- 7.1 (m, 10H), 6.9 (d, J=8.7 Hz, 1H), 4.87 (q, J=7.3 Hz, 1H), 4.1 (m, 1H), 2.85 (t, J=7.5 Hz, 2H), 2.77 (t, J=8.4 Hz, 2H), 2.3 (d, J=5.1 Hz, 1H), 2.2 (m, 3H), 2.0 (m, 1H). LC/MS 94% (M+1) 323.

(g) N- (l- (S)-cyano-3-phenvl-propyl)-2- (R)-methoxv-4-phenyl-butyramide, (Compound 39)

By proceeding in a manner similar to Example 11 (a) above but using (S)-2-amino-4-phenyl- butyronitrile hydrochloride (0.407 mmol, 80mg) and 2 (R)-methoxy-4-phenyl-butyric acid (Reference Example 10) there was prepared N- N-(1-S)-cyano-3-phenyl-propyl)-2-(R)-methoxy-4-phenyl-butyra mide as a white solid (91.8mg, 67%). 1H NMR (CDCl3) 7.2 (m, lOH), 6.8 (d, J=8.5 Hz, 1H), 4.86 (q, J=7.5 Hz, 1H), 3.67 (dd, J=6.5,4.5 Hz, 1H), 3.35 (s, 3H), 2.85 (m, 2H), 2.68 (t, J=8.0 Hz, 2H), 2.2-2.0 (m, 4H). LC/MS 84% (M+1) 337.

(h) 2,2-Difluoro-5-phennventanoic acid (l-cyano-cyclompy= (Compound 40)

By proceeding in a manner similar to Example 1 l (a) above but using 2,2-difluoro-5-phenyl-pentanoic acid and 1-amino-cyclopropanecarbonitrile hydrochloride there was prepared 2. 2-difluoro-5-phenyl- pentanoic acid (1-cyano-cyclopropyl)-amide. 1H NMR (CDCl3) 5 1. 32 (m, 2H), 1.64 (m, 2H), 1.82 (m, 2H), 2.12 (m, 2H), 2.8-2.56 (m, 2H), 6.82 (m, 1H), 7.36-7.15 (m, 5H). MS (ES-) 277.

(i) N- (l- (S)-Cyano-3-phenyl-propvl)-4-phenyl-butvramide, (Compound 41)

By proceeding in a manner similar to Example 11 (a) above but using (S)-2-amino-4-phenyl- butyronitrile hydrochloride and 4-phenylbutyric acid there was prepared N- !-cyano-3-phenyl-<BR> propyl ropvn-4-phenvl-butvramide as a colorless oil.'H NMR (CDCl3) : # 7.3 (m, 10H), 6.0 (d, J=8. 3 Hz, 1H), 4.9 (q, J=7.4 Hz, 1H), 2.8 (m, 2H), 2.65 (t, J=7.4 Hz, 2H), 2.15 (m, 4H), 1.95 (m, 2H). LC/MS 100% (M+1) 307.

EXAMPLE 12 2,2-difluoro-5-phenyl-pentanoic acid ((S)-1-cyano-3-phenyl-propyl)-amide, (Compound 42) A mixture of 2, 2-difluoro-5-phenyl-pentanoic acid (109mg, 0.509 mmol), (S)-2-amino-4-phenyl- butyronitrile hydrochloride (103mg, 0.523 mmol) and HATU (206mg, 0.542 mmol) in DMF (4mL) and stirred at room temperature for 5hours then evaporated under reduced pressure. The residue was taken in ethyl acetate washed with IN HCI, sodium bicarbonate and then water. Organic extract was dried over Na2SO4 and then evaporated under vacuum to give orange oil. The residue was subjected to mplc, eluting with a mixture of ethyl acetate and heptane (1: 9, v/v) to give 2,2-difluoro-5-phenyl- pentanoic acid ( S)-1-cvano-3-phenvpropvl)-amide as colorless oil (82 mg).'H NMR (CDC13) 7.3- 7.1 (m, 10H), 6.9 (bs, 1H), 4.80 (q, J=7.5 Hz, 1H), 2.80 (dt, J=7.3,2.7 Hz, 2H), 2.65 (t, J=7.5 Hz, 2H), 2.2-2.0 (m, 4H), 1.8 (m, 2H). MS 357 (MH+), 379 (M+Na).

EXAMPLE 13 (a) N- (4-Cvano-1-ethvl-piperidin-4-vl)-3-cvclohexyl-propionamide

Step 1. To a stirred solution of 1-ethyl-4-piperidone (25g, 0. 197mol) in 300ml of diethyl ether, and NH4CI (22. 3g, 0.41mol), was added NaCN (14. 5g, 0.295mol, in 70ml water) drop-wise at room temperature. After stirring for 24h the diethyl ether was separated and the water phase was extracted with n-BuOH, then washed with brine and dried. After removal of most of the n-BuOH under reduced pressure, the residue was diluted with 50ml of diethyl ether and then acidified with 2N HCl in diethyl ether solution at 0°C. The solid was dried under vacuum to yield 45g of 4-amino-1-ethyl-piperidine-4- carbonitrile HCI salt.

Step 2. To a stirred mixture of 3-cyclohexyl-propionic acid 156mg,lmmol), 4-amino-1-ethyl- piperidine-4-carbonitrile HCI salt (227, Irrtmol, prepared as in step 1 above), and HATU (570mg, 1.5mmol) in MeC12 (5ml), was added N, N-diisopropylethylamine (516mg, 4mmol) at room temperature. After stirring for 14 hours, the reaction mixture was extracted with ethyl acetate. The organic layer was washed with saturated NaHC03, brine, dried with MgS04 and concentrated to yield N- (4-Cyano-1-ethyl-piperidin-4-yl)-3-cvclohexyl-propionamide (170mg). LC-MS: elution time = 2.25min. 290.2 (M-1), 292.2 (M+1). (MS: API 150EX. LC: HP Agilent 1100 Series. Column: Phenomenex, 5u ODS3 100A 100X3mm. ; Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% acetonitrile, 1% water, 0.1% AcOH.

Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.).

(b) N-(4-Cvano-1-eth-piperidin-4-yl)-3- (2-difluoromethoxy-phenylmethanesulfonyl)- propionamide

By proceeding in a similar manner to Example 13 (a) but using 3- (2-difluoromethoxy- phenylmethanesulfonyl)-propionic acid (294mg, 1mmol) and 4-amino-1-ethyl-piperidine-4- carbonitrile HCI salt (227, lmmol) there was N-(4-cyano-1-ethyl-piperidin-4-yl)-3-(2-difluoromethoxy- phenylmethanesulfonyl)-propionamide 260mg). LC-MS: RT =1.96min., 428.2 (M-1), 430.3 (M+1).

MS: API 150EX. (LC: Agilent 1100Series, Column: Phenomenex, 5u ODS3 IOOA lOOX3mm. Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1 % acetonitrile, 0. 1 % AcOH. Solvent B, 99% actonitrile, 1% water, 0. 1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.).

EXAMPLE 14 (S)-tert-Butyl-carbamic acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester

(S)-N-Cyanomethyl-3-cyclohexyl-2-hydroxy-propiponamide (53mg, 0. 252mmol) was dissolved in dichloromethane (1mL). Triethylamine (O. lmL) was added and then tert.-butyl isocyanate (0.034mL, 0. 3mmol). The mixture was stirred at room temperature overnight. After dilution with ethyl acetate (100mL), the solution was washed with IN aqueous. HCl, brine, sat. aqueous NaHCO3, and brine, dried with MgS04 and evaporated under vacuum. Flash chromatography on silica gel (hexane/ethyl acetate 1: 1) gave (S)-tert-Butvl-carbamic acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester (63mg, 0.204mmol) as a white solid.

EXAMPLE 15 (a) (R)-Carbamic acid 1- (cyanomethyl-carbamovl)-2- (2-difluoromethoxy- phenylmethanesulfonv)-ethyl ester

(R)-N-Cyanomethyl-3-(2-(1,1-difluoromethoxy)-phenylmethanesu lfonyl)-2-hydroxy-propionamide {100mg, 0. 287mmol, Example l (a)} was dissolved in dichloromethane (2mL) and THF (ImL).

Trichloroacetyl isocyanate (0. 05 ImL, 0.43mmol) was added and the mixture was stirred for lh. The

solvents were removed under vacuum and the residue was dissolved in 1,4-dioxane (lOmL). IN aqueous. HCI (5mL) was added and the mixture was heated at 70°C for 4h. After cooling to room temperature, the mixture was extracted with ethyl acetate. The combined organic layers were washed with brine, dried with MgS04 and evaporated under vacuum. Flash chromatography on silica gel (hexane/ethyl acetate 1 : 3) gave (R)-carbamic acid 1- (cyanomethvl-carbamoyl)-2- (2-difluoromethoxy- phenvlmethanesulfonvl)-ethvl ester (35mg, 0.089mmol) as a white solid.'H NMR: (DMSO) 8.90 (t, J=4.8Hz, 1H), 7.48-7.43 (m, 2H), 7. 30-7. 21 (m, 2H), 7.11 (t, JH, F=73.6Hz, 1H), 6.98-6.76 (br, 2H), 5.28-5.23 (m, 1H), 4.60 (s, 2H), 4.15 (d, J=4.8Hz, 2H), 3.70 (dd, J=10. OHz, J=14.8Hz, 1H), 3.54 (d, J=14.4Hz, 1H). MS: (M+H) + 392.

(b) (S)-Carbamic acid 1-(cyanomethyl-carbamoyl)-2-cyclohexyl-ethyl ester

By proceeding in a manner similar to Example 8 (a) above but using (R)-N-cyanomethyl-3-cyclohexyl- 2-hydroxy-propionamide there was prepared (SCarbamic acid 1- (cyanometh-yl-carbamoyl)-2- cvclohexvi-ethvl ester.'H NMR: (DMSO) 8.63 (t, J=5. 6Hz, 1H), 6.63 (br, 2H), 4.81-4.77 (m, 1H), 4. 11 (d, J=5 : 2Hz, 2H), 1.74-0.81 (m, 13H). MS: (M+H) t 254.

EXAMPLE 16 (a) (R)-Morpholine-4-carboxylic acid 1-(1-cYano-cYclopropylcarbamoyl)-2- phenylmethanesulfonyl-ethyl ester

DMF was added to a mixture of (R)-morpholine-4-carboxylic acid 1-carboxy-2- phenylmethanesulfonyl-ethyl ester {from step 2 in Example 4 (a)} (60mg, 0.168mmol), HATU (200mg, 0. 52mmol), and 1-amino-cyclopropanecarbonitrile hydrochloride (100mg, 0.84mmol). 4- Methylmorpholine (O. SmL) was added and the mixture was stirred overnight. The mixture was diluted with ethyl acetate (100mL), washed with IN aqueous. HCI, brine, sat. aqueous. NaHC03, brine, dried with MgS04 and evaporated under vacuum. Flash chromatography on silica gel (hexane/ethyl acetate

1: 2) gave (R)-morpholine-4-carboxylic acid 1-(1-cyano-cyclopropylcarbamoyl)-2- phenylmethanesulfonyl-ethyl ester (7mg, 0. 017mmol). 1H NMR: (DMSO) 9.16 (s, 1H), 7.40-7.32 (m, SH), 5.24-5.19 (m, 1H), 4.55 (d, J=13.2Hz, 1H), 4.48 (d, J=13.2Hz, 1H), 3.63-3.25 (m, lOH), 1.51- 1.39 (m, 2H), 1.20-1.07 (m, 2H). MS: (M+H) + 422.

(b) (R)-Morpholine-4-carboxylic acid 1-(4-cyano-tetrahydro-pyran-4-ylcarbamoyl)-2- phenylmethanesulfonyl-ethyl ester

By proceeding in a manner similar to Example 16 (a) above but using 4-amino-tetrahydropyran-4- carbonitrile hydrochloride {prepared according to Example 13 (a) stepl but using tetrahydropyran-4- one} there was prepared (R)-morpholine-4-carboxvlic acid 1- hvdro-pyran-4- ylcarbamovl)-2-phenylmethanesulfony]-ethyl ester. LC-MS : elution time = 3.2gamin. 464.4 (M-i), 466.2 (M+1). (MS: API 150EX. LC: HP Agilent 1100 Series. Column : Phenomenex, 5u ODS3 100A 100X3mm. ; Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% actonitrile, 1% water, 0.1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.) EXAMPLE 17 3-Cyclohexyl-2-hydroxy-N-[1-(oxazolo[4,5-b]pyridine-2-carbon yl)-propyl]-propionamide

Step 1. To a stirred solution of [1- (hydroxy-oxazolo [4,5-b] pyridin-2-yl-methyl)-propyl]-carbamic acid tert-butyl ester (3.1 g, lOmmol, prepared as described in Reference Example 20 step2.) in dioxane (4ml) was added HCI (4N solution in 5ml of dioxane) at room temperature. After 2 hours, ethyl ether (50ml) was added and the reaction mixture was filtered. The resultant solid was washed with an additional 20ml of ethyl ether and dried under vacuum to yield 3g of 2-amino-1-oxazolo[4,5- b] pvridin-2-yl-butan-1-ol HCI salt.

Step 2. To a stirred mixture of 3-cyclohexyl-2-hydroxy-propionic acid (155mg, 0. 9mmol), 2-amino- 1-oxazolo [4,5-b] pyridin-2-yl-butan-1-ol HCI salt, and HOBt (168mg, l. lmmol) in MeCN (Sml), was added EDC (270mg, 1. 4mmol) and N-methylmorpholine (0. 45ml) at 23°C. After stirring for 14 hours, the reaction mixture was extracted with ethyl acetate. The organic layer was washed with saturated NaHCO3, brine, dried with MgS04 and concentrated to yield 293 mg of 3-cvclohexvl-2-hvdroxyl- (hydroxy-oxazolo[4,5-b]pyridin-2-yl-methyl)-propyl]-propiona mide. which was used in step 3 following without further purification. MS: 360.3 (M-1), 362.3 (M+1), 384.2 (M+Na).

Step 3. To a stirred solution of 3-cyclohexyl-2-hydroxy-N-[1-(hydroxy-oxazolo [4,5-b] pyridin-2-yl- methyl)-propyl]-propionamide (300mg, 0.83mmol) in MeCl2 (20ml), was added Mn02 (1. 44g, 16.6mmol) at room temperature. After stirring for 30min. the mixture was filtered to remove Mn02, and washed with 20ml of MeCI2. The solvent was removed under vacuum and the residue was purified by silica gel column chromatography to yield 3-cyclohexel-2-hvdroxv-N-[1-(oxazolo [45-blpvridine- 2-carbonyl)-propvll-propionamide (40mg). H'NMR (DMSO-8) : 8.71 (1H, dd, NH, diastereomer), 8.38 (1H, dd,), 8.28 (1H, m), 7.7-7.6 (1H, m), 5.5-5.4 (1H, m), 5.2-5.1 (1H, m), 3.95-3.991H, br., OH), 2.1-1.95 (1H, m), 1.85-1.75 (1, m), 1.7-0.8 (16H, m).

MS: 358.1 (M-l), 360.1 (M+l), 382 (M+Na).

EXAMPLE 18 (a) (R)-N- [1- (Benzothiazole-2-carbonyl)-butyl]-2-isopropvlamino-3-phenylm ethanesulfonyl- propionamide A solution of (R)-N- [1- (benzothiazol-2-yl-hydroxy-methyl)-butyl]-2-isopropylamino-3 - phenylmethanesulfonyl-propionamide {30mg, 0.06mmol, Example 30 (a)} in dichloromethane (lOmL) was treated with Dess-Martin-periodinane (51mg, 0.12mmol). This mixture was stirred at room temperature for 45 minutes then treated with resin-bound thiosulfate (400mg, 0.6mmol) and stirring was continued for a further 24 hours then the mixture was treated with AP-Trisamine (270mg, 0.6mmol). After stirring for a further 24 hours the reaction mixture was filtered and the filtrate was evaporated to give (R)-N-Ll- (benzothiazole-2-carbonvl)-buty-2-isopropYlamino-3- phenylmethanesulfonyl-propionamide (23mg, 75%) as mixture of diastereomers.'H NMR (CDCI3, 300MHz) : 8. 29-8.27 (m, 1H), 8.23-8.19 (m, 1H), 8.01-7.98 (m, 1H), 7.63-7.36 (m, 7H), 5.80-5.74 (m,

1H), 4.36-4.31 (m, 2H), [ 3. 79 (dd, J=9. SHz, 3Hz), 3.73 (dd, J=9Hz, 2.5Hz) 1H], 3.41-3.34 (m, 1H), 3.20-3.01 (m, 1H), 2.89-2.85 (m, 1H), 2.17-2.06 (m, 1H), 1.88-1.78 (m, 1H), 1.52-1.25 (m, 3H), 1.12- 1.06 (m, 6H), [0.96 (t, J=7.5Hz) 0.95 (t, J=7.5Hz) 1H]. LC/MS m/z=502 (M+H).

(b) (R)-N- [1- (Benzothiazole-2-carbonyl)-butyll-3-phenvlmethanesulfonvl-2- (tetrahydro-pvran-4- ylamino !-propionamide

By proceeding in a similar manner to Example 18 (a) but using (R)-N- [1- (benzothiazol-2-yl-hydroxy- methyl)-butyl]-3-phenylmethanesulfonyl-2-(tetrahydro-pyran-4 -ylamino)-propionamide {0.11 mmol, Example 29 (b)} and subjecting the crude product to HPLC there was re ared R-N-1- benzothiazole-2-carbonyl)-butyl]-3-phenylmethanesulfonyl-2-( tetrahydro-pyran-4-ylamino)- propionamide (lOmg, 16%). LC/MS retention time 2.92min (TIC), m/z=544 (M+H) (determined with method A).

(c) (R)-N- [l- (Benzothiazole-2-carbonyl)-butyl]-2-dibenzylamino-3-phenvlme thanesulfonyl- propionamide

By proceeding in a similar manner to Example 18 (a) but using (R)-N- [1- (benzothiazol-2-yl-hydroxy- methyl)-butyl]-2-dibenzylamino-3-phenylmethanesulfonyl-propi onamide {0. 11 mmol, Example 29 (a)} and subjecting the crude product to HPLC there was prepared (R)-N-f 1-fbenzothiazole-2-carbonyl)- butyl]-2-dibenzylamino-3-phenylmethanesulfonyl-propionamide (4mg) as mixture of diastereomers.

'H NMR (CDC13, 300MHz) : 8.33-7.89 (m, 3H), 7.61-7.55 (m, 2H), 7.47-7. 29 (m, 15H), 5.75 (m, 1H), [4.54 (d, J=14Hz), 4.51 (d, J=13.5Hz), 1H], [4.27 (d, J=14Hz), 4.25 (d, J=13.5Hz), 1H], 4.11-3.95 (m, 2H), [3.78 (d, J=13Hz), 3.76 (d, J=13Hz), 2H], [3.51 (d, J=13Hz), 3.50 (d, J=13Hz), 2H], 3.19-3.13 (m, 1H), 2.10-1.77 (m, 2H), 1.51-1.37 (m, 2H), 0.91-084 (m, 3H). LC/MS m/z=640 (M+H).

(d) (R)-N- [1- (Benzothiazole-2-carbonyl)-butyll-2-dimethylamino-3-phenvlme thanesulfonyl- propionamide

By proceeding in a similar manner to Example 18 (a) but using (R)-N- [1- (benzothiazol-2-yl-hydroxy- methyl)-butyl]-2-dimethylamino-3-phenylmethanesulfonyl-propi onamide {30mg, 0.06mmol, Example 30 (b)}, and subjecting the crude product to HPLC there was prepared (R)-N- [1- (benzothiazole-2- carbonyl)-butyl]-2-dimethylamino-3-phenylmethanesulfonyl-pro pionamide (11mg, 38%).

LC/MS retention time 2.98min (TIC), m/z=488 (M+H) (determined with method A).

EXAMPLE 19 (a) (R)-N- [ (S)-l- (Benzoxazole-2-carbonyl)-butyl]-3-phenylmethanesulfonyl-tetr ahydro-pyran- 4-vlamino !-propionamide A solution of (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-pheny lmethanesulfonyl-2- (tetrahydro-pyran-4-ylamino)-propionamide {0.22mmol, Example 31 (a)} in dichloromethane (lOmL) was treated with Dess-Martin-periodinane (187mg, 0.44mmol). This mixture was agitated at room temperature overnight then treated with resin-bound thiosulfate (1. 47g, 2.2mmol) and stirring was continued for a further 24 hours then the mixture was treated with Silicycle Triamine (61 lmg, 2.2mmol). After agitating for a further 24 hours the reaction mixture was filtered. The filtrate was evaporated and the residue was subjected to HPLC to give (R)-N-[(S)-1-(benzoxazole-2-carbonyl)- butl-3-phenylmethanesulfonyl-2- (tetrahydro-pvran-4-ylamino)-propionamide (9mg, 8%). LC/MS retention time 3.0min (TIC), m/z=528 (M+H) (determined with method B).

(b) (R)-N-[(S)-1-(Benzoxazole-2-carbonyl)-butyl]-2-(1-methyl-pip eridin-4-ylamino)-3- phenylmethanesulfonyl-propionamide

By proceeding in a similar manner to Example 19 (a) but using (R)-N-[(S)-1-(benzoxazol-2-yl- hydroxy-methyl)-butyl]-2- (l-methyl-piperidin-4-ylamino)-3-phenylmethanesulfonyl-propi onamide {0. 22mmol, Example 3 I (b)} there was prepared (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-(1- methyl-piperidin-4-ylamino)-3-phenylmethanesulfonyl-propiona mide (7mg, 6%).

LC/MS retention time 2.7min (TIC), m/z=541 (M+H) (determined with method A).

(c) (R)-N-[(S)-1-(Benzoxazole-2-carbonyl)-butyl]-2-(bis-thiophen -2-ylmethyl-amino)-3- phenylmethanesulfonyl-propionamide By proceeding in a similar manner to Example 19 (a) but using (R)-N-[(S)-1-(benzoxazol-2-yl- hydroxy-methyl)-butyl]-2- (bis-thiophen-2-ylmethyl-amino)-3-phenylmethanesulfonyl-prop ionamide {0. 22mmol, Example 31 (c)} there was prepared (R)-N-r (S)-1- (benzoxazole-2-carbonyl)-butyll-2- (bis- thiophen-2-ylmethyl-amino)-3-phenylmethanesulfonyl-propionam ide (5.3mg, 4%) LC/MS retention time 3.7min (TIC), m/z=636 (M+H) (determined with method A).

(d) (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-dibenzylamino -3-phenylmethanesulfonyl- propionamide

By proceeding in a similar manner to Example 19 (a) but using (R)-N-[(S)-1-(benzoxazol-2-yl- hydroxy-methyl)-butyl]-2-dibenzylamino-3-phenylmethanesulfon yl-propionamide {0. 22mmol, Example 31 (d)} there was prepared (R)-N-r (S)-l- (benzoxazole-2-carbonyl)-buty !]-2-dibenzylamino-3- phenvlmethanesulfonyl-propionamide (3.8mg, 3%). LC/MS retention time 4.14min (TIC), m/z=624 (M+H) (determined with method B).

(e) (S)-N- [ (S)-l- (Benzoxazole-2-carbonvl)-butvl]-2- (tetrahvdro-pyran-4-ylamino)-3-thiophen-2- yl-propionamide

By proceeding in a similar manner to Example 19 (a) but using (S)-N-[(S)-1-(benzoxazol-2-yl- <BR> <BR> hydroxy-methyl)-butyl]-2- (tetrahydro-pyran-4-ylamino)-3-thiophen-2-yl-propionamide {0. 22mmol, Example 31 (e)} there was prepared (S)-N-l (S)-1-(benzoxazole-2-carbonyl)-butyl]-2-(tetrahYdro- pyran-4-ylamino)-3-thiophen-2-yl-propionamide (6.5mg, 6%). LC/MS retention time 2.92min (TIC), m/z=456 (M+H) (determined with method B). (f) (S)-N-[(S)-1-(Benzoxazole-2-carbonyl)-butyl]-2-isopropylamin o-3-thiophen-2-yl- propionamide

By proceeding in a similar manner to Example 19 (a) but using (S)-N-[(S)-1-(Benzoxazol-2-yl- hydroxy-methyl)-butyl]-2-isopropylamino-3-thiophen-2-yl-prop ionamide {0. 22mmol, Example 31 (f)},

there was prepared (S)-N-l (S)-l-(benzoxazole-2-carbonyl !-butyl]-2-isopropylamino-3-thiophen-2 propionamide (10.6mg, 12%). LC/MS retention time 2.99min (TIC), m/z=414 (M+H) (determined with method B).

EXAMPLE 20 (a) (R)-N-[1-Benzothiazole-2-carbonyl)-butyl]-3-phenylmethanesul fonyl-2-(tetrahydro-pyran-4- vlamino !-propionamide A solution of (R)-N- [1- (benzothiazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesul fonyl-2- (tetrahydro-pyran-4-ylamino)-propionamide {0. 22mmol, Example 32(a)} in dichloromethane (10mL) was treated with Dess-Martin-periodinane (187mg (0.44mmol). After stirring at room temperature for 30minutes the reaction mixture was treated with saturated sodium thiosulfate solution (SOml) and saturated sodium bicarbonate solution (50ml). The phases were separated and the aqueous phase extracted with dichloromethane. The combined organic phases were washed with brine, then dried over magnesium sulfate and then evaporated. The residue was subjected to flash chromatography using a silica gel cartridge to give (R)-N- [1- !-butyll-3- phenvlmethanesulfontetrahvdro-pvran-4-ylamino)-propionamide (46mg, 38%) as mixture of diastereoisomers. The two diastereomers were separated by silica gel column chromatography eluting with 1: 1 v/v heptane-ethyl acetate mixture.

DiastereoisomerA: 'H NMR (CDC13, 300MHz) : 8.23-8.20 (m, 2H), 8.00 (dd, J=7Hz, 2Hz, 1H), 7.63-7.53 (m, 2H), 7.48- 7.40 (m, 5H), 5.80 (m, 1H), 4.38 (d, J=14Hz, 1H), 4.32 (d, J=14Hz, 1H), 3.97-3.90 (m, 2H), 3.80 (dd, J=9. SHz, 3Hz, 1H), 3.43-3.30 (m, 3H), 3.13 (dd, J=14.5Hz, 9.5Hz, 1H), 2.70 (m, 1H), 2.27 (m, 1H), 2.09 (m, 1H), 1.91-1.76 (m, 3H), 1.52-1.37 (m, 4H), 0.95 (t, J=7.5Hz, 3H).

LC/MS m/z=544 (M+H) DiastereoisomerB: 'H NMR (CDC13, 300MHz) : 8.22-8.19 (m, 2H), 8.01-7.98 (m, 1H), 7.63-7.53 (m, 2H), 7.44-7.37 (m, 5H), 5.74 (m, 1H), 4.35-4.31 (m, 2H), 3.99-3.94 (m, 2H), 3.86 (dd J=9. SHz, 3Hz, 1H), 3.49-3.33 (m, 3H), 3.08 (dd, J=14.5Hz, 9.5Hz), 2.75-2.70 (m, 1H), 2.22 (m, 1H), 2.15-2.06 (m, 1H), 1.91-1.75 (m, 3H), 1.53-1.37 (m, 4H), 0.96 (t, J=7.5Hz, 3H).

LC/MS m/z=544 (M+H) (b) (R)-N-r (S)-l- (Benzoxazole-2-carbonyl)-butyll-3-phenylmethanesulfonyl-2- (tetrahvdro-pyran- 4-ylamino)-propionamide

By proceeding in a similar manner to Example 20 (a) but using (R)-N-[(S)-1-(benzoxazol-2-yl- hydroxy-methyl)-butyl]-3-phenylmethanesulfonyl-2- (tetrahydro-pyran-4-ylamino)-propionamide {0. 22mmol, Example 32 (b)} there was prepared (R)-N- [(S)-1-(benzoxazole-2-carbonyl)-butyl]-3- phenylmethanesuflonyl-2-(tetrahydro-pyran-4-ylamino)-propion amide (48mg, 41%). 1H NMR (CDCl3, 300MHz) : 8.22 (d, J=8. 5Hz, 1H), 7.92 (d, J=8Hz, 1H), 7.68 (d, J=8.5Hz, 1H), 7.60-7.40 (m, 7H), 5.68- 5.61 (m, 1H), 4.37 (d, J=14HZ, 1H), 4.31 (d, J=14Hz, 1H), 3.97-3.91 (m, 2H), 3.80 (dd, J=9.5Hz, 3Hz, 1H), 3.43-3.32 (m, 3H), 3. 12 (dd, J=14. 5Hz, 9.5Hz, 1H), 2.73-2.66 (m, 1H), 2.26 (m, 1H), 2.13-2.05 (m, 1H), 1. 89-1. 77 (m, 3H), 1. 52-1.39 (m, 4H), 0.97 (t, J=7.5Hz, 3H). LC/MS m/z=528 (M+H).

EXAMPLE 21 (a) (R)-N- [ (S)-1- (Benzoxazole-2-carbonyl)-butyl]-2-isopropvlamino-3-phenylmet hanesulfonyl- propionamide A solution of (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-isopr opylamino-3- phenylmethanesulfonyl-propionamide {30mg, 0.063mmol, Example 31 (g)} in dichloromethane (lOmL) was treated with Dess-Martin-periodinane (53mg, 0.126mmol) and this mixture was stirred at room temperature for 1 hour then subjected to The Mettler-Toledo AllexTM liquid handler work-up as describedbelow: Dichloromethane (l5ml) was added to the reaction mixture, followed by a 1: 1 mixture (8ml) of saturated sodium thiosulfate solution and saturated sodium bicarbonate solution. The phases were

separated and the organic phase washed with another Sml of the thiosulfate/bicarbonate solution. The organic phase was then washed with brine and then dried over magnesium sulfate. The crude product was subjected to flash chromatography using a silica gel cartridge to give (R)-N- [ (S)-1- (benzoxazole- 2-carbonyl)-butl-2-isopropylamino-3-phenylmethanesulfonyl propionamide (6.2mg, 20%). LC/MS retention time 2.7min (TIC), m/z=486 (M+H) (determined with method C).

(b) (R)-N- [ (S)-1- (Benzoxazole-2-carbonvl)-butyll-2- [ (2-methoxy-ethvl)- (tetrahydro-pyran-4-yl)- aminol-3-phenvlmethanesulfonvl-propionamide

By proceeding in a similar manner to Example 21 (a) but using (R)-N- [ (S)-]- (Benzoxazol-2-yl- hydroxy-methyl)-butyl]-2-[(2-methoxy-ethyl)-(tetrahydro-pyra n-4-yl)-amino]-3- phenylmethanesulfonyl-propionamide {80mg, 0.136 mmol, Example 32 (d)} there was prepared (R)-N- L(S)-1- (Benzoxazole-2-carbonyl)-butyl]-2- [ (2-methoxv-ethyltetrahydro-pvran-4-yl)-amino]-3- phenvlmethanesulfbnyl-propionamide (7mg, 9%). LC/MS retention time 3.5min (TIC), m/z=586 (M+H) (determined with method C).

(c) (R)-N- [ (S)-1- (Benzoxazole-2-carbonyl)-butvl]-2-cvclohexylamino-3-phenylme thanesulfonyl- propionamide

By proceeding in a similar manner to Example 21 (a) but using (R)-N-[(S)-1-(benzoxazol-2-yl- hydroxy-methyl)-butyl]-2-cyclohexylamino-3-phenylmethanesulf onyl-propionamide {48mg, 0. 091mmol, Example 32 (e)} there was prepared (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2- cyclohexylamino-3-phenylmethanesulfonyl-propionamide (7.9mg, 16%). LC/MS retention time 2.99- 3.02min (TIC), m/z=526 (M+H) (determined with method C).

(d) (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-dimethylamino -3-phenylmethanesulfonyl- propionamide

By proceeding in a similar manner to Example 21 (a) but using (R)-N-[(S)-1-(Benzoxazol-2-yl- hydroxy-methyl)-butyl]-2-dimethylamino-3-phenylmethanesulfon yl-propionamide {lOmg, 0.021mmol, Example 32 (f)} there was prepared (R)-N-f(SLBenzoxazole-2-carbonvl)-butyl]-2- dimethvlamino-3-phenylmethanesulfonyl-propionamide (2.5mg, 24%). LC/MS retention time 2.82min (TIC), m/z=472 (M+H) (determined with method C).

EXAMPLE 22 (lS)-N-fl- (Benzooxazole-2-carbonvl)-butvl1-2- (S)-fIuoro-4-phenvl-butyramide Step 1. To a mixture of (S)-2-amino-1-benzoxazol-2-yl-pentan-1-ol {0. 549 mmol, 121 mg, Reference Example 17 (c)}, (S)-2-fluoro-4-phenyl-butyric acid (1.0 eq., 0.549 mmol, 100 mg, Reference Example 9) and N, N-diispropylethylamine (1.1 eq., 0.604 mmol, 78 mg) in dry dichloromethane (5 mL) under nitrogen was added PyBOP (1.1 eq., 0.603 mmol, 285 mg). The mixture was stirred at room temperature for 23.5 hr, then concentrated in vacuum. The residue was diluted with ethyl acetate (20 mL) and washed with sodium bicarbonate (30 mL) then water (30 mL). The organic layer was dried (MgS04) and concentrated in vacuum. The residue was purified by silica gel column chromatography, eluting with ethyl acetate and heptane (1 : 2) to afford (S)-N- [(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)- butyl]-2-fluoro-4-phenyl-butyramide as mixture of diastereoisomers (167.8 mg, 79.5%).

Step 2. To a solution of (S)-N- [(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-fluoro4-phe nyl- butyramide in dry dichloromethane (5mL) under nitrogen was added a 15% (wt in dichloromethane,

2.0 eq, 0.863 mmol, 2.44 g) of 1, 1, 1-triacetoxy-1, 1-dihydro-1, 2-benziodoxol-3 (1H)-one (Dess-Martin periodinane). The mixture was stirred at room temperature for 2 hr, then quenched by adding a solution of Na2S203 (4.0 eq., 1.73 mmol, 273 mg) in saturated Sodium bicarbonate solution (30 ml).

The organic layer was dried (MgS04) and concentrated in vacuum. The residue was purified over 10 g silica gel, eluting with ethyl acetate and heptane (1: 3) to afford (1S)-N- [1- (Benzooxazole-2- carbonyl)-butl-2- (S)-fluoro-4-phenyl-butvramide as a light yellow solid (156 mg, 94%).'H NMR (CDCl3) 7.95 (d, J=7.9 Hz, 1H), 7.7 (d, J=8.2 Hz, 1H), 7.6 (t, J=7. 3 Hz, 1H), 7.51 (t, J=7.4 Hz, 1H), 7.2 (m, 6H), 5.8 (m, 1H), 4.95 (ddd, J=49.4,8,3.5 Hz, 1H), 2.8 (m, 2H), 2.4 (m, 1H), 2.2 (m, 2H), 1.85 (m, 1H), 1.5 (m, 2H), 1.0 (t, J=7.3 Hz, 3H). LC/MS 86% (M+1) 383.

EXAMPLE 23 2*2-Difluoro-5-phenyl-pentanoic acid f (S)-1- (benzoxazole-2-carbonyl)-butyll-amide Step 1. A solution 2,2-Difluoro-5-phenyl-pentanoic acid (182 mg, 0.85 mmol) in DMF (10 mL) was treated with (S)-2-amino-1-benzoxazol-2-yl-pentan-1-ol (187 mg, 0.85 mmol), HATU (323 mg, 0.85 mmol) and N, N-Diisopropylethylamine (0.162 mL) and stirred at room temperature for 5 1/2 hrs. DMF evaporate off, crude taken up in ethyl acetate and washed with 1N HCI, saturated NaHC03 and brine.

Dried over Na2SO4 and evaporated under reduced pressure to give an oil. Purification by column chromatography eluting with 1: 1 mixture of ethyl acetate and heptane gave 2,2-Difluoro-5-phenyl- pentanoic acid [(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-amide as orange oil (216 mg).

MS 417 (MH+).

Step 2. A solution of 2, 2-Difluoro-5-phenyl-pentanoic acid [(S)-1-(benzoxazol-2-yl-hydroxy-methyl)- butyl]-amide (216 mg, 0.52 mmol) in dichloromethane (10 mL) was treated with 1,1,1-triacetoxy-1,1- dihydro-1, 2-benziodoxol-3 (1H)-one (Dess-Martin periodinane) (220 mg, 0.52 mmol) for lhr at room temperature. The reaction mixture was washed with 0.5 M Na2S203, saturated NaHC03, and water and dried over Na2SO4. Solvent evaporated under reduced pressure and crude purified by flash chromatography eluting with mixture of ethyl acetate and heptane to give 2, 2-Difluoro-5-phenyl- pentanoic acid [ !-l-(benzoxazole-2-carbonyl !-butyll-amide as offwhite solid (90 mg).

'H NMR (CDC13) 7.93 (d, J=8 Hz, 1H), 7.68 (d, J=8 Hz, 1H), 7.59 (t, J=8 Hz, 1H), 7.49 (t, J=8 Hz, 1H), 7.3-7.11 (m, 5H), 5.72 (m, 1H), 2.67 (t, J=7.5 Hz, 2H), 2.22-2.07 (m, 3H), 1.92-1.77 (m, 3H), 1.55-1.26 (m, 2H), 0.96 (t, J=7.4Hz, 3H).

LC/MS 415 (M+1).

EXAMPLE 24 (a) Morpholine4-carboxvlic acid (S)-1-[(S !-1-(benzooxazole-2-carbonyl)-propylcarbamoyll-2- cyclohexyl-ethyl ester Step 1. (S)-3-Cyclohexyl-2-hydroxy-propionic acid (3g, 17.4mmol) was dissolved in methanol (30mL). Trimethylorthoformate (5mL) and p-toluenesulfonic acid monohydrate (100mg) was added.

The mixture was stirred at ambient temperature overnight. Water (50mL) was added and stirring was continued for 2h. Methanol was removed under vacuum and the aqueous residue was extracted with ethyl acetate (3x50mL). The combined organic layers were washed with sat. aqueous NaHC03 and brine, dried with MgS04 and evaporated. (S)-3-Cyclohexyl-2-hydroxy-propionic acid methyl ester was obtained as a colorless liquid (3.1g, 16.7mmol).

Step 2. (S)-3-Cyclohexyl-2-hydroxy-propionic acid methyl ester (lg, 5.37mmol) was dissolved in dichloromethane (20mL). Pyridine (0.57mL, 7mmol) was added and the solution was cooled to 0°C under nitrogen. Trichloromethylchloroformate (0.66mL, 5. 5mmol) was added and the mixture was stirred for 30min at room temperature. Morpholine (O. SmL) was added and stirring was continued for 2h. After dilution with ethyl acetate (200mL), the solution was washed with IN aqueous. HCI and brine, dried with MgS04 and evaporated under vacuum. The residue was dissolved in methanol (50mL) and IN aqueous. NaOH solution (20mL) was added. The mixture was stirred at room temperature for 4h. Methanol was removed under vacuum and the aqueous residue was washed with diethylether. The aqueous layer was acidified with IN aqueous HCI and extracted with ethyl acetate (3xlOOmL). The combined organic layers were washed with brine, dried with MgS04 and evaporated under vacuum. The crude (S)-morpholine-4-carboxylic acid 1-carboxy-2-cyclohexyl-ethyl ester was used without further purification.

Step 3. By proceeding in a similar manner to that described in step3 Example 4 (a) but using (S)- morpholine-4-carboxylic acid 1-carboxy-2-cyclohexyl-ethyl ester there was prepared morpholine-4- carboxylic acid lic acid (S)-1- (S)-1- (benzooxazole-2-carbonyl)-propvlcarbamoy]-2-cyclohexyl-ethyl ester.

'H NMR: (DMSO) 8.61 (d, J=6.4Hz, 1H), 7.97 (d, J=8. 0Hz, 1H), 7.87 (d, J=8. 0Hz, 1H), 7.61 (t, J=8. 0Hz, 1H), 7.52 (t, J=8. 0Hz, 1H), 5.15-5.09 (m, 1H), 4.91-4.86 (m, 1H), 3.56-3.20 (m, 8H), 2.05- 1.93 (m, 1H), 1.79-0.78 (m, 14H), 0.96 (t, J=7.2Hz, 3H). MS: (M+H) + 472.

By proceeding in a similar manner to Example 24 (a) there was prepared: (b) Morpholine-4-carboxylic acid (S)-2-cyclohexyl-1-[(S)-1-(oxazolo[4,5-b]pyridine-2-carbonyl )- propelcarbamoel]-ethyl ester

'H NMR : (DMSO) 8.73-8.69 (m, 2H), 8.38 (d, J=8. 0Hz, IH), 7.67-7.62 (m, 1H), 5.08-5.02 (m, 1H), 4.88-4.83 (m, 1H), 3.57-3.20 (m, 8H), 2.07-1.95 (m, 1H), 1.79-0.75 (m, 14H), 0.97 (t, J=7.2Hz, 3H).

MS: (M+H) + 473;.

(c) Morpholine4-carboxylic acid (S)-2-cyclohexyl-1-[(S)-1-(5-ethyl-[1,3,4] oxadiazole-2- carbonyl)-propvlcarbamoyl]-ethyl ester

'H NMR: (DMSO) 8.62 (d, J=4.8Hz, 1H), 4.94-4.84 (m, 2H), 3.57-3.20 (m, 8H), 2.95 (q, J=7.2Hz, 2H), 1.98-1.87 (m, 1H), 1.74-0.82 (m, 14H), 1.29 (t, J=7.2Hz, 3H), 0.93 (t, J=7.2Hz, 3H). MS: (M+H) + 451 ; (d) Morpholine-4-carboxylic acid S)-2-cyclohexyl-1-[(S)-1-(5-phenyl-[1,3,4]oxadiazole-2- carbonyl)-propvlcarbamoyl]-ethyl ester

'H NMR: (DMSO) 8.69 (d, J=6. 0Hz, 1H), 8.07 (d, J=8Hz, 2H), 7.70-7.59 (m, 3H), 4.99-4.92 (m, 1H), 4.88-4.83 (m, 1H), 3.57-3.20 (m, 8H), 2.03-1.92 (m, 1H), 1.77-0.77 (m, 14H), 0.96 (t, J=7.2Hz, 3H).

MS: (M+H) + 499 ; (e) Morpholine-4-carboxvlic acid (S)-1- [ (S)-1- (benzooxazole-2-carbonyl)-propylcarbamoyl]-3- cyclohexyl-propyl ester 'H NMR : (DMSO) 8. 60 (d, J=6.8Hz, 1H), 7.97 (d, J=8. OHz, 1H), 7.87 (d, J=8. OHz, 1H), 7. 61 (t, J=8. OHz, 1H), 7. 52 (t, J=8. OHz, 1H), 5. 13-5.06 (m, 1H), 4.81-4.76 (m, 1H), 3.56-3.21 (m, 8H), 2.05- 1. 93 (m, 1H), 1. 79-1. 46 (m, 8H), 1. 19-0. 90 (m, 6H), 0.96 (t, J=7.2Hz, 3H), 0.77-0.62 (m, 2H). MS: (M+H) + 486 ; EXAMPLE 25 <BR> 4- 4, 4-Dimethyl-2- (morpholine-4-carbonyloxy)-pentanovlamino]-3-oxo-azepane-1-c arboxylic acid benzyl ester Sodium hydride (60% in mineral oil, lOg, 250mmol) was suspended in dry DMF. Allyl-carbamic acid benzyl ester (l9. lg, l00mmol) was added dropwise at ambient temperature. After stirring for 5min, 5- bromo-1-pentene (25g, 168mmol) was added dropwise. Stirring was continued at 50°C for 1h. The reaction was quenched with water and then partitioned between diethylether and water. The ether layer was washed with water and brine, dried with MgS04 and evaporated under vacuum. Flash chromatography (ethyl acetate/hexane 1: 9) gave 15. 5g allyl-pent-4-enyl-carbamic acid benzyl ester.

Allyl-pent-4-enyl-carbamic acid benzyl ester (15. 5g, 59. 8mmol) was dissolved in dichloromethane and bis (tricyclohexylphosphine) benzylidene ruthenium (IV) dichloride (lg) was added. The mixture was refluxed under a nitrogen atmosphere until TLC analysis showed complete reaction. The solvent was evaporated under vacuum and the residue was purified by flash chromatography (ethyl acetate/hexane 1: 9). Yield: 7.8g 2,3,4,7-Tetrahydro-azepine-1-carboxylic acid benzyl ester.

To a solution of 2, 3,4,7-tetrahydro-azepine-1-carboxylic acid benzyl ester (4.5g, 19.45mmol) in dichloromethane (50mL) was added m-chloroperbenzoic acid (60mmol). The mixture was stirred at ambient temperature for 16h. Sat aqueous K2CO3 solution was added and the mixture was extracted with dichloromethane. The combined organic layers were washed with sat. aqueous NaHCO3 and brine, dried with MgS04 and evaporated under vacuum. The crude epoxide was dissolved in a 8: 1 methanol/water mixture (lOOmL). Ammonium chloride (3.2g, 60mmol) and sodium azide (3.9g, 60mmol) was added and the mixture was heated at 60°C for 48h. Most of the solvent was removed under vacuum. The residue was extracted with ethyl acetate. The combined organic layers were washed with sat. aqueous NaHC03 (200mL) and brine (200mL), dried with MgS04 and evaporated under vacuum. Flash chromatography of the residue (hexane/ethyl acetate 3: 1) gave 3.3g of 4-azido-3- hydroxy-azepane-1-carboxylic acid benzyl ester.

To a solution of 4-azido-3-hydroxy-azepane-1-carboxylic acid benzyl ester (3.3g, 11.37mmol) in methanol (50mL) was added triethylamine (5mL) and 1,3-propanedithiol (3.42mL, 35mmol). The mixture was stirred at ambient temperature until TLC analysis showed complete consumption of the starting material. A white precipitate was removed by filtration and the filtrate was evaporated to dryness. The residue was triturated with a 1: 1 hexane/diethylether mixture to remove excess dithiol and dried under vacuum.

Crude 4-amino-3-hydroxy-azepane-1-carboxylic acid benzyl ester (150mg, 0.57mmol), morpholine-4- carboxylic acid 1-carboxy-3, 3-dimethyl-butyl ester (120mg, 0.46mmol), EDC (400mg, 2.1mmol), and HOBt (400mg, 2.5mmol) were combined. Dichloromethane (5mL) was added and then 4- methylmorpholine (0. 5mL). The mixture was stirred at ambient temperature for 2h. After dilution with ethyl acetate (lOOmL) the solution was washed with IN HCI, sat. aqueous NaHC03 and brine, dried with MgS04 and evaporated under vacuum. The residue was dissolved in DMSO (5mL).

Triethylamine (0.3mL) and then S03 pyridine complex (150mg) were added and the mixture was stirred at ambient temperature for 2h. After dilution with ethyl acetate (lOOmL), the solution was washed with water (50mL) and brine, dried with MgS04 and evaporated under vacuum. The residue was purified by flash chromatography on silica gel and gave 4-f4, 4-Dimethyl-2- (morpholine-4-

carbonyloxy)-pentanoylaminol-3-oxo-azepane-1-carboxylic acid benzyl ester (95mg, 0.189mmol) as a white solid.

2: 1 mixture of diastereomers,'H NMR: (DMSO) 8.14-8.08 (m, 1H), 7.40-7.25 (m, 5H), 5.18-4.89 (m, 3H), 4.51-4.33 (m, 2H), 4.01-3.76 (m, 2H), 3.60-3.25 (m, 8H), 2.95-2.79 (m, 1H), 1.84-1.54 (m, 6H), 0.92/0.91 (s, 9H). MS: (M+H) + 504. LC/MS m/z=474 (M+H) EXAMPLE 26 (a) (R)-N-r (S)-1- (Benzoxazole-2-carbonyl)-butyl]-3-cvclopropvlmethanesulfonyl -2- (tetrahydro- pvran-4-ylamino)-propionamide Step 1. (R)-2-Amino-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl] -3- cyclopropylmethanesulfonyl-propionamide {90mg, 0.22mmol, ReferenceExample 11 (s)} was dissolved in 5% acetic acid in acetonitrile (lOml). Tetrahydro-4H-pyran-4-one ( 10mg, 1. lmmol) was added, followed by (polystyrylmethyl) trimethylammonium cyanoborohydride (107mg, l. lmmol). The resulting reaction mixture was stirred for four hours and then filtered under suction. The solvents were evaporated under high vacuum. The residue was dissolved in 5ml dichloromethane, Silicycle Triamine (940mg, 2.2mmol) was added and the reaction mixture stirred for four hours. It was filtered under suction and the filtrate concentrated under reduced pressure to give (R)-N- [fS)-l-fBenzoxazol-2-vl- <BR> <BR> <BR> hydroxv-methyl)-butyll-3-cvclopropvlmethanesulfonvl-2- (tetrahvdro-pvran-4-vlamino)-propionamide (89mg, 0.18mmol, 82%).

Step 2. (R)-N- [ (S)-1- (Benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-cyclopropylmethane sulfonyl-2- (tetrahydro-pyran-4-ylamino)-propionamide (89mg, 0.18mmol) was dissolved in lOml dichloromethane. The Dess-Martin-periodinane (153mg, 0.36mmol) was added and the resulting reaction mixture stirred for two hours. The reaction mixture was poured into a 1/1-mixture of saturated sodium bicarbonate solution and saturated sodium thiosulfate solution. The aqueous phase was extracted with dichloromethane. The combined organic phases were washed with saturated sodium bicarbonate solution and brine. The organic phase was dried with magnesium sulfate and the dichloromethane evaporated under reduced pressure. The crude product was purified via flash chromatography (heptane/ethyl acetate 1/1 to elute) to give (R)-N-r (S)-I-(benzoxazole-2-carbonyl)- butyll-3-cyclopropvlmethanesulfonvl-2- (tetrahydro-pvran-4-vlamino)-propionamide (24mg,

0.049mmol, 27%).'H NMR (CDCl3, 300MHz) : 8.29 (d, J=8.5Hz, 1H), 7.93 (d, J=8Hz, 1H), 7.68 (d, J=8Hz, 1H), 7.59-7.46 (m, 2H), 5.67 (m, 1H), 3.99-3.93 (m, 2H), 3.84 (dd, J=9.5Hz, 2.5Hz, 1H), 3.56 (dd, J=14.5Hz, 2.5Hz, 1H), 3.42-3.33 (m, 2H), 3.24 (dd, J=14.5Hz, 9.5Hz, 1H), 3.02-2.99 (m, 2H), 2.78-2.71 (m, 1H), 2.13-2.07 (m, 1H), 1.95-1.78 (m, 3H), 1.55-1.41 (m, 5H), 1.23-1.16 (m, 1H), 1.00 (t, J=7.5Hz, 3H), 0.81-0.74 (m, 2H), 0.48-0.43 (m, 2H).

LC/MS m/z=492 (M+H) (b) (R)-N- [1- (benzoxazole-2-carbonvl)-butyl]-2-cvclohexylamino-3-cyclopro pvlmethanesulfonyl- propionamide

By proceeding in a similar manner to Example 26 (a) but using cyclohexanone there was prepared (R)-N- [l- (benzoxazole-2-carbon l =butvll-2-cyclohexylamino-3-cvclopropylmethanesu : fonvl- propionamide (predominantly as one diastereomer).'H NMR (CDCI3, 300MHz) : 8.37 (d, J=8.5Hz, 1H), 7.92 (d, J=8Hz, 1H), 7. 67 (d, J=8Hz, 1H), 7. 59-7.36 (m, 2H), 5.65 (m, 1H), 3.79 (dd, J=9.5Hz, 2.5Hz, 1H), 3.54 (dd, J=14. 25Hz, 2.5Hz, 1H), 3.24 (dd, J=14.25Hz, 9.5Hz, 1H), 3.02-2.95 (m, 2H), 2.49 (m, 1H), 2.12-2.07 (m, 1H), 1.96-1.17 (m, 15H), 0.98 (t, J=7Hz, 3H), 0.80-0.72 (m, 2H), 0.48- 0.43 (m, 2H). LC/MS m/z=490 (M+H)

(c) R)-N- [1- (Benzoxazole-2-carbonv !)-butvl]-2-cvcloheptylamino-3- cyclopropvlmethanesulfonyl-propionamide

By proceeding in a similar manner to Example 26 (a) but using cycloheptanone there was prepared (R)-N- [1- (benzoxazole-2-carbonvl)-butv]-2-cvcloheptvlamino-3-cvclopro pvlmethanesulfonyl- propionamide'H NMR (CDCl3, 300MHz) : [8.36 (d, J=8.5Hz), 8.28 (d, J=8.5Hz), 1H], [8.05 (dd, J=8Hz, 1Hz), 7.97 (dd, J=8.5Hz, 1. 5Hz), 1H], [7.92 (d, J=8.5Hz), 7.67 (d, J=8Hz), 1H], 7.59-7.48 (m, 1H), [7.44 (ddd, J=8Hz, 7.5Hz, 1Hz), 7.19 (ddd, J=8Hz, 7.5Hz, 1Hz), 1H], [5.65 (m), 5.62 (m), 1H],

[3.82 (dd, J=lOHz, 3Hz), 3.75 (dd, J=9Hz, 3Hz), 1H], [3.55 (dd, J=14.5Hz, 3Hz), 3.49 (dd, J=14.5Hz, 3Hz), 1H], 3. 27 (dd, J=14.5Hz, 9Hz, 1H), 3.03-2.96 (m, 2H), 2.72 (m, 1H), 2.14-2.05 (m, 1H), 1.91- 1.39 (m, 16H), 1.23-1.17 (m, 1H), [0.99 (t, J=7.25Hz), 0.98 (t, J=7.25Hz), 1H], 0.79-0.7 (m, 2H), 0.48- 0.44 (m, 2H). LC/MS m/z=504 (M+H).

(d) (R)-3-Phenylmethanesulfonyl-N- [ (S)-3-phenyl-1- (thiazole-2-carbonvl)-propvl]-2- (tetrahydro-<BR> pvran-4-vlamino)-propionamide By proceeding in a similar manner to Example 26 (a) but using (R)-2-Amino-N-[(S)-1-(hydroxy- thiazol-2ryl-methyl)-3-phenyl-propyl]-3-phenylmethanesulfony l-propionamide {Reference Example l l (k)} there was prepared (R)-3-phenylmethanesulfonyl-N- [(S)-3-phenyl-l- (thiazole-2-carbonyl)- propvl] 2-(tetrahydro-pyran-4-ylamino)-propionamide. 1H NMR (CI3, 300MHz) : 8.27 (d, J=9Hz, 1H), 8.06 (d, J=3Hz, 1H), 7.73 (d, J=3Hz, 1H), 7.47-7.39 (m, 5H), 7.25-7.11 (m, 5H), 5.72 (m, 1H), 4.36 (d, J=14Hz, 1H), 4.31 (d, J=14Hz, 1H), 3.97-3.90 (m, 2H), 3.76 (dd, J=9.5Hz, 3Hz, 1H), 3.40- 3.31 (m, 3H), 3.01 (dd, J=14.5Hz, 9.5Hz, 1H), 2.76-2.62 (m, 3H), 2.51-2.40 (m, 1H), 2.22-2.09 (m, 1H), 1.87-1.75 (m, 2H), 1. 53-1.38 (m, 3H) LC/MS m/z=556 (M+H); (e) (R)-N- [ (S)-l- (Benzoxazole-2-carbonvl)-3-phenyl-propvl]-3-cvclopropvlmetha nesulfonyl-2- (tetrahydro-pvran-4-vlamino)-propionamide

By proceeding in a similar manner to Example 26 (a) but using (R)-2-amino-N-[(S)-I-(hydroxy- thiazol-2-yl-methyl)-3-phenyl-propyl]-3-phenylmethanesulfony l-propionamide {Reference Example 11 (j)} there was prepared (R)-N- ( (S)-1- (Benzoxazole-2-carbonyl)-3-phenyl-propyll-3- cyclopropylmethanesulfonyl-2-(tetrahydro-pyran-4-ylamino)-pr opionamide. 1H NMR (CDCl3, 300MHz) : 8.36 (d, J=8.5Hz, 1H), 7.92 (d, J=8Hz, 1H), 7.67 (d, J=8Hz, 1H), 7.60-7.46 (m, 2H), 7.25- 7.16 (m, 5H), 5.72 (m, 1H), 3.99-3.93 (m, 2H), 3.81 (dd, J=9.5Hz, 3Hz, 1H), 3.52 (dd, J=14Hz, 3Hz, 1H), 3.41-3.33 (m, 2H), 3.15 (dd, J=14Hz, 9.5Hz, 1H), 3.01-2.70 (m, 2H), 2.81-2.70 (m, 3H), 2.53 (m, 1H), 2.27-2.23 (m, 1H), 1.94-1.44 (m, 5H), 1.22-1.17 (m, 1H), 0.80-0.74 (m, 2H), 0.47-0.42 (m, 2H).

LC/MS m/z=554 (M+H) ; (f) (R)-3-Cypro, vlmethanesulfonvl-N- [1- (5-ethyl-1, 2, 4-oxadiazole-3-carbonyl)-propyl]-2-<BR> (tetrahydro-pvran-4-ylamino)-propionamide By proceeding in a similar manner to Example 26 (a) but using (R)-2-Amino-3- cyclopropylmethanesulfonyl-N-{(S)-1-[(5-ethyl-1,2,4-oxadiazo l-3-yI)-hydroxy-methy !]-propyl}- propionamide {Reference Example 1 l (h)} there was prepared (R)-3-cyclopropylmethanesulfonyl-N- [1-(5-ethyl-1,2,4-oxadiazole-3-carbonyl)-propyl]-2-(tetrahyd ro-pyran-4-ylamino)-propionamide. 1H NMR (CDCl3, 300MHz) : [8.28 (d, J=8.5Hz), 8.15 (d, J=8Hz), 1H], [5.40 (m), 5.33 (m), 1H], 3.99-3.95 (m, 2H), [3.90 (dd, J=lOHz, 3Hz), 3.84 (dd, J=9.5Hz, 3Hz), 1H], [3.55 (dd, J=14Hz, 3Hz), 3.47 (dd, J=14hz, 11Hz), 1H], 3.45-3.33 (m, 2H), 3.23 (dd, 14Hz, lOHz, 1H), 3.07-2.94 (m, 4H), 2.82-2.71 (m, 1H), 2.19-2.08 (m, 1H), 1.95-1.77 (m, 5H), 1.58-1.43 (m, 1H), 1.45 (t, J=7.5Hz, 3H), 1.23-1.14 (m, 1H), [1.00 (t, J=7.5Hz), 0.97 (t, J= 7.5Hz), 3H], 0.81-0.73 (m, 2H), 0.48-0.41 (m, 2H). LC/MS m/z=457 (M+H); (g) (R)-3-Phenylmethanesulfonyl-N-[1-(3-phenyl-1,2,4-oxadiazole- 5-carbonyl)-propyl]-2- (tetrahydro-pyran-4-ylamino)-propionamide

By proceeding in a similar manner to Example 26 (a) but using (R)-2-Amino-N- {1- [hydroxy- (3- phenyl-1, 2,4-oxadiazol-5-yl)-methyl]-propyl}-3-phenylmethanesulfonyl- propionamide {Reference Example 1 l (g)} there was prepared (R)-3-phenylmethanesulfonyl-N-[1-(3-phenyl-1,2, 4-oxadiazole-5- carbonyD-propvl]-2- (tetrahydro-pyran-4-ylamino)-propionamide.'H NMR (CDCIs, 300MHz) : [8.15 (d, J=8Hz), 8.14 (d, J=8Hz), 1H], 7.61-7.39 (m, 10H), [5.46 (m), 5.40 (m), 1H], 4.344.28 (m, 2H), 4.09-3.93 (m, 2H), [3.87 (dd, J=9.5Hz, 3Hz), 3.81 (dd, J=9.5Hz, 3Hz), 1H], 3.41-3.32 (m, 3H), [3.16 (dd, J=13.5Hz, lOHz), 3.11 (dd, J=14Hz, 9.5Hz), 1H], 2.75-2.68 (m, 1H), 2.23-2.13 (m, 1H), 1.96-1.43 (m, 6H), 1.06-0.99 (m, 3H), LC/MS m/z=541 (M+H).

(h) (R)-N-[1-(3-Cyclopropyl-1,2,4-oxadiazole-5-carbonyl)-propyl] -3-phenylmethanesulfonyl-2- (tetrahvdro-pvran-4-ylamino)-propionamide By proceeding in a similar manner to Example 26 (a) but using (R)-2-Amino-3- phenylmethanesulfonyl-N- {(S)-I-[(3-cyclopropyl-1, 2,4-oxadiazol-5-yl)-hydroxy-methyl]-propyl}- propionamide {Reference Example 11 (1)} there was prepared (R)-N- [1- (3-cvclopropyl-1, 2, 4- oxadiazole-5-carbonyl)-propyl]-3-phenvlmethanesulfonvl-2- (tetrahvdro-pvran-4-ylamino)- propionamide.'H NMR (CDCl3, 300MHz) : [8.19 (d, J=8.5Hz), 8.11 (d, J=7.5Hz), 1H], 7.46-7.40 (m, 5H), [5.33 (m), 5.27 (m), 1H], 4.55-4.35 (m, 2H), 3.99-3.95 (m, 2H), [3.88 (dd, J=IOHz, 3Hz), 3.83 (dd, J=9.5Hz, 3Hz), 1H], 3.44-3.34 (m, 3H), 3.18-3.07 (m, 1H), 2.78-2.67 (m, 1H), 2.24-2.17 (m, 1H), 2.15-2.08 (m, 1H), 1.89-1.72 (m, 3H), 1.55-1.43 (m, 2H), 1.20-1.11 (m, 4H), [0.98 (t, J=7.5Hz), 0.97 (t, J=7.5Hz), 3H].

LC/MS m/z=505 (M+H).

EXAMPLE 27 (a) { (R)-1- [1- (Benzothiazol-2-yl-hydroxy-methyl)-butvlcarbamovll-2-phenylm ethanesulfonyl- ethvlT-carbamic acid tert-butvl ester

N-cyclohexylcarbodiimide, N'-methyl polystyrene (1.74g, 3.4mmol) suspended in a mixture of dichloromethane (lOml) and dimethylformamide (2mL) was treated with hydroxybenzotriazole (391mg, 2.89mmol) and L-N-boc-benzylsulfonylalanine (876mg, 2.55mmol). This mixture was stirred at room temperature for 30 minutes, then treated with 2-amino-1-benzothiazol-2-yl-pentan-1-ol {400mg, 1. 7mmol, Reference Example 17 (d)}) and after stirring for a further 2 hours the mixture was then treated with Silicycle-Triamine (2.36g, 8. 5mmol). The reaction mixture was stirred for 2 hours and then filtered. The filtrate was evaporated to give the title compound (888mg, 93%). LC/MS m/z=562.

(b) {(R)-1-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoy l]-2-phenylmethanesulfonyl- ethyll-carbamic acid tert-butvl ester By proceeding in a manner similar to Example 27 (a) above but using L-N-boc-benylsulfonylalanine (876mg, 2.55mmol) and (2S)-2-amino-1-benzooxazol-2-yl-pentan-1-ol {374mg, 1. 7mmol, Reference Example 17 (c)} there was prepared. { (R)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl ]- 2-phenvlmethanesulfonyl-ethvll-carbamic acid tert-butyl ester (908mg, 98%).

(c) {(S)-1-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoy l]-2-thiophen-2-yl-ethyl}- carbamic acid tert-butyl ester

By proceeding in a manner similar to Example 27 (a) above but using Resin-bound diimide (1.76g, 3.4mmol) suspended in dichloromethane (lOmL), hydroxybenzotriazole (391mg, 2.89mmol), (2S)-2- tert-butoxycarbonylamino-3-thiophen-2-yl-propionic acid (692mg, 2. 55mmol), (2S)-2-amino-1- benzooxazol-2-yl-pentan-1-ol {374mg, 1. 7mmol, Reference Example 17 (c)} and Silicycle-Triamine (2.36g, 8.5mmol) there was prepared { {(S)-1-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)- butylcarbamoyl]-2-thiophen-2-yl-ethyl}-carbamic acid ter-butyl ester (790mg (1.67mmol, 98%).

LC/MS: m/z=562 (M+H).

(d) f (R)-1- [1- (Benzothiazol-2-yl-hvdroxv-methyl)-butvlcarbamoyl]-2-phenylm ethanesulfonvl- ethyl}-carbamic acid tert-butyl ester By proceeding in a manner similar to Example 27 (a) above but using Resin-bound diimide (741mg, 1.26mmol), hydroxybenzotriazole (144mg, 1.07mmol), L-N-boc-benzylsulfonylalanine (326mg, 0.95mmol), 2-amino-l-benzothiazol-2-yl-pentan-l-ol {150mg, 0. 63mmol, Reference Example 17 (d)} and Silicycle-Triamine (2. 36g, 8.5mmol) there was prepared { (R)-1- [1-fbenzothiazol-2-vl-hydroxv- methyl)-butylcarbamoyl]-2-phenylmethanesulfonyl-ethyl}-carba mic acid tert-butyl ester, LC/MS m/z=562 (M+H), which was used without further purification (e) {R)-1-f(S)-l- (Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyll-2-phenylmet hanesulfonyl- ethyl I-carbamic acid tert-butyl ester

By proceeding in a manner similar to Example 27 (a) above but using Resin-bound diimide (1.76g, 3.4mmol), hydroxybenzotriazole (391mg, 2.89mmol), L-N-boc-benzylsulfonylalanine (876mg, 2.55mmol), (2S)-2-amino-1-benzooxazol-2-yl-pentan-1-ol {374mg, 1. 7mmol, Reference Example 17 (c)} and Silicycle-Triamine (2.36g, 8.5mmol) there was prepared { (R)-l- [ (S)-l- (benzoxazoI-2-yt- hydroxv-methyl)-butylcarbamol-2-phenvlmethanesulfonyl-ethvll -carbamic acid ter-butyl ester, LC/MS m/z=546 (M+H), 490 (M=H-butene), which was used directly in the next reaction.

(f) (R)-1- [ (S)-1- (Benzoxazol-2-vl-hvdroxv-methvl)-butylcarbamoyl]-2-<BR> ; cvclopropvlmethanesulfonyl-ethvl}-carbamicacidtert-buty ! ester By proceeding in a manner similar to Example 27 (a) above but using a suspension of Resin-bound diimide (1.07g, 1.82mmol) in dichloromethane (20ml), hydroxybenzotriazole (209mg, 1. 55mmol) and (R)-2-tert-butoxycarbonylamino-3-cyclopropylmethanesulfonyl- propionic acid (420mg, 1. 365mmol, Reference Example 22), (S)-2-amino-1-benzoxazol-2-yl-pentan-1-ol {200mg 0. 91mmol, Reference Example 17 (c)} and Silicycle-Triamine (2.8g, 9.1mmol) there was prepared (benzoxazol-2-vl-hydroxv-methyl)-butvlcarbamovl]-2-cycloprop ylmethanesulfonyl-ethyl}-carbamic acid ter-butyl ester (450mg, 97%). LC/MS m/z=532 (M+Na), 510 (M+H), 454 (M+H-isobutene).

(g) (R)-1-{1-[Hydroxy-(3-phenyl-1, 2,4-oxadiazol-5-yl)-methyl]-propylcarbamoyl}-2- phenylmethanesulfonyl-ethyl)-carbamic acid ter-butyl ester

By proceeding in a manner similar to Example 27 (f) above but using L-N-boc-benzylsulfonylalanine and (R)-2-tert-butoxycarbonylamino-3-phenylmethanesulfonyl-propi onic acid and (S)-2-amino-1-(3- phenyl- [1, 2,4] oxadiazol-5-yl)-butan-1-ol (Reference Example 21) there was prepared rydroxv- 3-phenyl-1, 2, 4-oxadiazol-5-yl)-methvll-propylcarbamovl}-2-phenvlmethanesu lfonyl-ethyl)- carbamic acid tert-butyl ester. LC/MS m/z=545 (M+Na), 467 (M+H-isobutene), 423 (M+H-Boc).

(i) ((R)-2-Cyclopropylmethanesulfonyl-1-{(S)-1-[(5-ethyl-1,2,4-o xadiazol-3-yl)-hydroxy- methyl]-propylcarbamoyl}-ethyl)-carbamic acid tert-butyl ester

By proceeding in a manner similar to Example 27 (f) above but using 2-amino-1- (5-ethyl- [1, 2,4]- oxadiazol-3-yl-butan-1-ol (Reference Example 23) there was prepared R-2- cyclopropylmethanesulfonyl-1-{(S)-1-[(5-ethyl-1,2,4-oxadiazo l-3-yl)-hydroxy-methyl]- propylcarbamo-ethy)-carbamic acid tert-butyl ester. LC/MS m/z=497 (M+Na), 419 (M+H- isobutene), 375 (M+H-Boc). (j) {(R)-1-[1-(Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2 -phenylmethanesulfonyl- ethy}-carbamic acid tert-butyl ester

By proceeding in a manner similar to Example 27 (f) above but using L-N-boc-benzylsulfonylalanine and (S)-2-amino-1-benzoxazol-2-yl-pentan-1-ol {Reference Example 17 (c)} there was prepared {(R !- 1-[1-(benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2-phen ylmethanesulfonyl-ethyl}-carbamic acid tert-butyl ester. LC/MS m/z=546 (M+H), 490 (M+H-isobutene).

(k) f (R)-1-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-3-phenyl-propy lcarbamoyl]-2- cyclopropylmethanesulfonyl-ethyl}-carbamic acid tert-butyl ester

By proceeding in a manner similar to Example 27 (f) above but using (2S)-2-amino-4-phenyl-1- benzoxazol-2-yl-butan-1-ol there was prepared {(R)-1-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-3- phenyl-propylcarbamoyl]-2-cyclopropylmethanesulfonyl-ethyl}- carbamic acid tert-butyl ester.

LC/MS m/z=572 (M+H), 516 (M+H-isobutene).

(1) {(R)-1-[(S)-1-(Hydroxy-thiazol-2-yl-methyl)-3-phenyl-propylc arbamoyl]-2- phenylmethanesulfonyl-ethyll-carbamic acid tert-butvl ester

By proceeding in a manner similar to Example 27 (f) above but using L-N-boc-benzylsulfonylalanine and (2S)-2-amino-4-phenyl-1-thiazol-2-yl-butan-1-ol (Reference Example 13) there was prepared {(R)-1-[(S)-1-(hydroxy-thiazol-2-yl-methyl)-3-phenyl-propylc arbamoyl]-2-phenylmethanesulfonyl- ethyll-carbamic acid tert-butyl ester. LC/MS m/z=574 (M+H). (m) { (R)-1-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl ]-2- cyclopropylmethanesulfonyl-ethyl}-carbamic acid ter-butyl ester

By proceeding in a manner similar to Example 27 (f) above but using N-Cyclohexylcarbodiimide, N'- methyl polystyrene (1.07g, 1.82mmol) suspended in dichloromethane (20mL), hydroxybenzotriazole (209mg, 1. 55mmol), (R)-2-tert-butoxycarbonylamino-3-cyclopropylmethanesulfonyl- propionic acid (420mg, 1.365mmol, Reference Example 22), (S)-2-amino-1-benzoxazol-2-yl-pentan-1-ol {200mg 0. 91mmol, Reference Example 17 (c)} and Silicycle-Triamine (2.8g, 9. 1mmol) there was prepared { (R)-l- [(S)-1- (benzoxazol-2-yl-hvdroxv-methyl)-butvlcarbamovl]-2-cycloprop vlmethanesulfonvl- ethyl I-carbamic acid tert-butvl ester (450mg, 0.88mmol, 97%). LC/MS m/z=532 (M+Na), 510 (M+H), 454 (M+H-isobutene).

(n) (R)-1- [Hydroxy-(3-phenyl-1,2,4-oxadiazol-5-yl)-methyl]-propylcarba moyl}-2- phenylmethanesulfonyl-ethyl)-carbamic acid ter-butyl ester By proceeding in a manner similar to Example 27 (m) above but using L-N-boc-benzylsulfonylalanine and (S)-2- amino-1- (3-phenyl- [1, 2,4] oxadiazol-5-yl)-butan-I-ol (Reference Example 21) there was prepared R-1-1- [hydroxy-(3-phenyl-1,2,4-oxadiazol-5-yl)-methyl]-propylcarba moyl}-2-phenylmethanesulfonyl-ethyl)-carbamic acid tert-butyl ester. LC/MS m/z=545 (M+Na), 467 (M+H-isobutene), 423 (M+H-Boc).

(o) ( ((R)-2-Cyclopropylmethanesulfonyl-1-{(S)-1-[(5-ethyl-1,2,4-o xadiazol-3-yl)-hydroxy- methyl]-propvlcarbamo-ethvl)-carbamic acid tert-butyl ester

By proceeding in a manner similar to Example 27 (m) above but using (S)-2-amino-1- (5-ethyl- [1, 2,4] oxadiazol- 3-yl)-butan-1-ol there was prepared ( (R)-2-Cyclopropylmethanesulfonyl-1-{(S)-1-[(5-ethyl-1,2,4-ox aidazol-3- vl)-hvdroxv-methvll-propvlcarbamoyl}-ethy)-carbamic acid tert-butyl este. LC/MS m/z=497 (M+Na), 419 (M+H-isobutene), 375 (M+H-Boc) (p) {(R)-1-[1-(Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2 -phenylmethanesulfonyl- ethyl}_carbamic acid tert-butyl ester

By proceeding in a manner similar to Example 27 (m) above but using L-N-boc-benzylsulfonylalanine and (S)-2-amino-1-benzoxazol-2-yl-pentan-1-ol {200mg 0. 91mmol, Reference Example 17 (c)} there was prepared { (R)-1-[1-(Benzoxazol-2-yl-hydroxy-methyl)-butylcarbamoyl]-2- phenvlmethanesulfonyl-ethyl}-carbamic acid tert-butyl ester. LC/MS m/z=546 (M+H), 490 (M+H- isobutene) (q) f (R)-1-[(S)-1-(Benzoxazol--yl-hydroxy-methyl)-3-phenyl-propyl carbamoyl]-2- cyclopropylmethanesulfonyl-ethyl}-carbamic acid ter-butyl ester

By proceeding in a manner similar to Example 27 (m) above but using (2S)-2-amino-4-phenyl-1- benzoxazol-2-yl-butan-1-ol there was prepared f (R)-l-r (S)-l- (Benzoxazol-2-vl-hvdroxv-methyl)-3-

phenyl-propylcarbamoyl]-2-cyclopropylmethanesulfonyl-ethyl}- carbamic acid tert-butyl ester.

LC/MS m/z=572 (M+H), 516 (M+H-isobutene).

(r) { (R)-1-r (S)-1- (Hvdroxv-thiazol-2-yl-methvl)-3-phenyl-propvlcarbamovl]-2- phenvlmethanesulfonyvl}-carbamic acid tert-butyt ester By proceeding in a manner similar to Example 27 (m) above but using L-N-boc-benzylsulfonylalanine and (2S)-2-amino-4-phenyl-1-thiazol-2-yl-butan-1-ol (Reference Example 13) there was prepared

{(R)-1-[(S)-1-(Hydroxy-thiazol-2-yl-methyl)-3-phenyl-propylc arbamoyl]-2-phenylmethanesulfonyl- ethyl}-carbamic acid tert butyl ester. LC/MS m/z=574(M+H) (s) ((R)-2-phenylmethanesulfonyl-1-{(S)-1-[(3-cyclopropyl-1, 2,4-oxadiazol-5-yl !-hvdroxy methy]-propylcarbamovl-ethyl)-carbamic acid tert-butvl ester

By proceeding in a manner similar to Example 27 (m) above but using L-N-boc-benzylsulfonylalanine and (S)-2-amino-1- (3-cyclopropyl-1, 2,4-oxadiazol-5-yl)-butan-1-ol (Reference Example 14) there was prepared ((R)-2-phenylmethanesulfonyl-1-{(S)-1-[(3-cyclopropyl-1,2,4- oxadiazol-5-yl)-hydroxy- methyll-propvlcarbamoyll-ethvl)-carbamic acid ter-butyl ester.

EXAMPLE 28 (R)-N-[1-(Benzoxazole-2-carbonyl)-butyl]-2-[cyclopropylmethy l-(tetrahydro-pyran-4-ylmethyl)- amino]-3-phenylmethanesulfonyl-propionamide

Step 1. (R)-2-Amino-N- [1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesulfo nyl- propionamide {200mg, 0.448mmol, Reference Example 11 (i)} was dissolved in 5% acetic acid in acetonitrile (lOml). Tetrahydro-pyran-4-carbaldehyde (51mg, 0.448mmol) was added and the reaction mixture stirred for 16 hours. (Polystyrylmethyl) trimethylammonium cyanoborohydride (218mg, 0.896mmol) was added and the reaction mixture stirred for 3 hours. Cyclopropanecarbaldehyde (157mg, 2.24mmol) was added and stirring continued for 3 hours. The mixture was filtered under suction and the filtrate concentrated under high vacuum.

Step 2. The residue was dissolved in 10ml dichloromethane. The Dess-Martin-periodinane (380mg, 0.896mmol) was added and the resulting reaction mixture stirred for two hours. The reaction mixture was poured into a 1/l-mixture of saturated sodium bicarbonate solution and saturated sodium thiosulfate solution. The aqueous phase was extracted with dichloromethane. The combined organic phases were washed with saturated sodium bicarbonate solution and brine. The organic phase was dried with magnesium sulfate and the dichloromethane evaporated under reduced pressure. The crude product was purified via flash chromatography (heptane/ethyl acetate 2/1 followed by heptane/ethyl acetate 1/1 to elute) to give R)-N- [1- (benzoxazole-2-carbonvl)-butyl1-2-fcvclopropvlmethyl- (tetrahvdro-p, vran-4-ylmethyl)-amino]-3-phenylmethanesulfonyl-propionamide as mixture of diastereomers. (83mg, 0.139mmol, 31%). LC/MS m/z=596 (M+H) retention time 3.84 (method C).

EXAMPLE 29 (a) (R !-N-I 1-(benzothiazol-2-vl-hedroxv-methyl)-butvl]-2-dibenzvlamino- 3- phenylmethanesulfonyl-propionamide (R)-2-Amino-N- [I- (benzothiazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesul fonyl-

propionamide {50mg, 0.11mmol, Reference Example 1 l (a)} was dissolved in a mixture of acetonitrile (5ml) and acetic acid (Iml). Benzaldehyde (56µl, 0.55mmol, 5 equivalents) and resin bound cyanoborohydride (54mg, 0.22mmol, 2 equivalents) were added. The reaction mixture was stirred overnight, filtered under suction and the filtrate evaporated to give the (R)-N-rl-(benzothiazol-2-vl- hydroxy-methyl)-butyl]-2-dibenzylamino-3-phenylmethanesulfon yl-propionamide which was used without further purification in the preparation of Example 18 (c).

(b) (R)-N-[1-(Benzothiazol-2-yl-hydroxy-methyl)-butyl]-3-phenylm ethanesulfonyl-2-(tetrahydro- pvran-4-ylamino)-propionamide

By proceeding in a manner similar to Example 29 (a) above but using tetrahydro-4H-pyran-4-one (51µl, 0.55mmol, 5 equivalents) there was prepared R)-N-[1-(benzothiazol-2-yl-hydroxy-methyl)- butyl]-3-phenylmethanesulfonyl-2-(tetrahydro-pyran-4-ylamino )-propionamide. LC/MS m/z=546 (M+H) EXAMPLE 30 (a) (R)-N-fl- (Benzothiazol-2-yl-hvdroxy-methyl)-butvl]-2-isopropvlamino-3 - phenvlmethanesulfonyl-propionamide

(R)-2-Amino-N- [1- (benzothiazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesul fonyl- propionamide {50mg, 0. 1 lmmol, Reference Example 11 (a)} was dissolved in a mixture of acetonitrile (Sml) and acetic acid (lml). Acetone (500µl) and resin bound cyanoborohydride (54mg, 0.22mmol, 2 equivalents) were added. The reaction mixture was stirred overnight, filtered under suction and

concentrated under vacuum. The residue was dissolved in dichloromethane and AP Trisamine (Argonaut Technology) (550mg, 1. 2mmol) was added. The mixture was stirred for two hours, filtered under suction and the filtrate concentrated under vacuum to give (R)-N- [1- (benzothiazol-2-yl-hydroxy- methyl)-butyl]-2-isopropylamino-3-phenylmethanesulfonyl-prop ionamide (30mg, 0.06mmol, 54%).

LC/MS m/z=504 (M+H).

(b) (R)-N-[l- (Benzothiazol-2-yvdroxv-methyl)-butyl]-2-dimethylamino-3- phenvlmethanesulfonvl-propionamide

By proceeding in a manner similar to Example 30 (a) above but using formaldehyde solution (75µl, 1mmol, 37w-% aqueous solution) there was prepared R)-N-[1-(benzothiazol-2-yl-hydroxy- ., methyl)-butyl]-2-dimethylamino-3-phenylmethanesulfonyl-propi onamide (30mg, 54%). LC/MS m/z=490 (M+H).

EXAMPLE 31 (a) (R)-N- [ (S)-l- (Benzoxazol-2-vI-hvdroxy-methyl)-butvl]-3-phenvlmethanesulfb nyI-2- (tetrahvdro-pvran-4-ylamino)-propionamide

A solution of (R)-2-amino-N- [ (S)-I- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3- phenylmethanesulfonyl-propionamide {100mg, 0. 22mmol, Reference Example I I (c)} in a mixture of acetonitrile (5mL) and acetic acid (lmL) was treated with tetrahydro-4H-pyran-4-one (101y1, 1.1 mmol). After agitating at room temperature for 3 hours the mixture was then treated with resin- bound cyanoborohydride (108mg, 0. 44mmol) and agitation was continued overnight. The reaction mixture was filtered and the filtrate was evaporated. The residue was dissolved in dichloromethane (lOmL) and the solution was treated with Silicycle Triamine (61 lmg, 2.2mmol), then agitated for 2

hours and then filtered. The solution of (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-3- phenylmethanesulfonyl-2-(tetrahydro-pyran-4-ylamino)-propion amide was used directly in the preparation of Example 20 (b).

(b) (R)-N-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-(1-me thyl-piperidin-4-ylamino)-3- phenylmethanesulfonyl-propionamide

By proceeding in a manner similar to Example 31 (a) above but using 1-methyl-4-piperidone (136y1, l. lmmol) there was prepared fR)-N- [ (S)-l- (Benzoxazol-2-yl-hydroxv-methyl)-butvl]-2- (l- methyl-piperidin-4-ylamino)-3-phenylmethanesulfonyl-propiona mide was used directly in the preparation of Example 19 (b).

(c) (R)-N-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-(bis- thiophen-2-ylmethyl-amino)-3- phenylmethanesulfbnyl-propionamide

By proceeding in a manner similar to Example 31 (a) above but using 2-thiophenecarboxaldehyde (20, lut1, 0.22mmol) there was prepared (R)-N- [fS)-l-fbenzoxazoI-2-yl- hvdroxy-methyl (bis-thiophen-2-vlmethyl-amino)3-phenylmethanesulfonyl-propi onamide was used directly in the preparation of Example 19 (c).

(d) (R)-N- (S)-I- !-butvll-2-dibenzvlamino-3- phenylmethanesulfonvl-propionamide

By proceeding in a manner similar to Example 31 (a) above but using benzaldehyde (22y1, 0. 22mmol) there was prepared (R)-N-[(S)-1- (benzoxazol-2-vl-hydry-methvl)-butyll-2- dibenzvlamino-3-phenvlmethanesulfonyl-propionamide which was used directly in the preparation of Example 19 (d).

(e) (S)-N- [ (S)-l- (BenzoxazoI-2-vl-hvdroxv-methyl)-butvl1-2- (tetrahydro-pvran-4-ylamino)-3- thiophen-2-vl-propionamide

By proceeding in a manner similar to Example 317 (a) above but using (S)-2-amino-N-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-thiophen-2-yl-prop ionamide {82mg, 0. 22mmol, Reference Example 1 l (b)} and tetrahydro-4H-pyran-4-one (101y1, l. lmmol) there was prepared (S)-N- [ (S)-1- (Benzoxazol-2-vl-hvdroxy-methyl)-butyl]-2- (tetrahvdro-pvran-4-ylamino)-3-thiophen-2-vl- propionamide which was used directly in the preparation of Example 19 (e). <BR> <BR> <P>(f) (S)-N-f (S)-1- (Benzoxazol-2-vl-hydroxv-methvl)-butv]-2-isopropvlamino-3-th iophen-2-yl- propionamide

By proceeding in a manner similar to Example 31 (a) above but using (S)-2-amino-N-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-thiophen-2-yl-prop ionamide {82mg, 0.22mmol, Reference

Example 11 (b)} and acetone (100y1) there was prepared (S)-N-[(S)-1-(benzoxazol-2-yl-hydroxy- methyl)-butvll-2-isopropylamino-3-thiophen-2-yl-propionamide which was used directly in the preparation of Example 19 (f).

(g) (R)-N- [ (S)-l- (Benzoxazol-2-vl-hvdroxy-methyl)-butyll-2-isopropylamino-3- phenylmethanesulfonyl-propionamide

By proceeding in a manner similar to Example 31 (a) above but using acetone (500fil) there was prepared (R0-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-isopr opylamino-3- phenylmethanesulfonyl-propionamide (30.5mg, 29%). LC/MS m/z=488 (M+H).

EXAMPLE 32 (a) (R)-N- [l- (Benzothiazol-2-yl-hvdroxy-methyl)-butyll-3-phenylmethanesul fonyl-2- (tetrahydro- pyran-4-ylamino)-propionamide A solution of (R)-2-amino-N-[1-(benzothiazol-2-yl-hydroxy-methyl)-butyl]-3 -phenylmethanesulfonyl- propionamide {100mg, 0. 22mmol, Reference Example 1 l (a)} in a mixture of acetonitrile and acetic acid (lOmL, 95: 5, v/v) was treated with tetrahydro-4H-pyran-4-one (101y1, l. lmmol) and resin-bound cyanoborohydride (108mg, 0.44mmol). This mixture was stirred at room temperature overnight then evaporated. The residue was dissolved in dichloromethane and the solution was treated with Silicycle Triamine (61 lmg, 2.2mmol) then stirred at room temperature for 2 hours then filtered. The filtrate was evaporated to give (R)-N- [l- (benzothiazol-2-yl-hydroxy-methyl)-butyll-3-phenvlmethanesul fonyl-2- (tetrahydrvran-4-ylamino)-propionamide, LC/MS m/z=546 (M+H), which was used directly in the preparation of Example 18 (b).

(b) (R)-N-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-pheny lmethanesulfonyl-2- (tetrahydro-pyran-4-ylamino)-propionamide

By proceeding in a manner similar to Example 32 (a) above but using (R)-2-amino-N-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesulfo nyl-propionamide {98mg, 0.22mmol, Reference Example 1 l (c)} there was prepared (R)-N- [(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]- 3-phenylmethanesulfonyl-2- (tetrahydro-pyran-4-ylamino)-propionamide, LC/MS m/z=530 (M+H), which was used directly in the preparation of Example 19 (a).

(c) (R)-N-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-pheny lmethanesulfonyl-2- (tetrahydro-pyran-4-ylamino)-propionamide By proceeding in a manner similar to Example 32 (a) above but using (R)-2-amino-N-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesulfo nyl-propionamide {Reference Example 1 l (c)} there was prepared (R)-N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-3- phenylmethanesulfonyl-2- (tetrahydro-pn-4-ylamino)-propionamide (106mg, 91%). LC/MS m/z=530 (M+H).

(d) (R [(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-[(2-methoxy -ethyl)-(tetrahydro- pyran-4-yl)-aminol-3-phenylmethanesulfonel-propionamide

By proceeding in a manner similar to Example 32 (a) above but using (R)-N-[(S)-1-(benzoxazol-2-yl- hydroxy-methyl)-butyl]-3-phenylmethanesulfonyl-2- (tetrahydro-pyran-4-ylamino)-propionamide {53mg, O. lmmol, Reference Example32 (c)} and 2-methoxyethanal (53mg, 0.55mmol) there was prepared (R)-N-[(S)-1-(benzoxazole-2-yl-hydroxy-methyl)-butyl]-2-[(2- methoxy-ethyl)-(tetrahydro- vyl)-aminol-3-phenylmethanesulfonvl-propionamide (56mg, 95%).

LC/MS m/z=588 (M+H) (e) (R)-N-r (S)-1- (Benzoxazol-2-yl-hydroxy-methvl)-butvl]-2-cvclohexylamino-3- phenylmethanesulfonyl-propionamide

By proceeding in a manner similar to Example 32 (a) above but using (R)-2-amino-N-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesulfo nyl-propionamide {49mg, O. 1 mmol, Reference 1 l (c)} and cyclohexanone (52y1, 0. 5mmol) there was prepared (R)-N-r (S)-1- (Benzoxazol-2- yl-hydroxy-methyl)-butyl]-2-cyclohexylamino-3-phenylmethanes ulfonyl-propionamide (48mg, 83%).

(f) (R)-N-[(S)-1-(Benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-dimet hylamino-3- phenylmethanesulfonel-propionamide

By proceeding in a manner similar to Example 32 (a) above but using (R)-2-amino-N-[(S)-1- (benzoxazol-2-yl-hydroxy-methyl)-butyl]-3-phenylmethanesulfo nyl-propionamide {49mg, O. 1 lmmol, Reference Exaple 1 l (c)} and formaldehyde (75µl, 1mmol, 37 w-% in water), there was prepared (R)- N-[(S)-1-(benzoxazol-2-yl-hydroxy-methyl)-butyl]-2-dimethyla mino-3-phenylmethanesulfonyl- propionamide (lOmg, 19%). LC/MS m/z=474 (M+H).

EXAMPLE 33 The following compounds of Formula 1 are provided by methods described in the application: (a) N-Cyanomethyl-3-cYclohexyl-propionamide

'H NMR: (CDCl3) 6.22 (br s, 1H), 4.20 (s, 2H), 2.23 (m, 2H), 1.65 (m, 5H), 1.50 (m, 2H), 1.10-1.30 (m, 4H), 0.90 (m, 2H); LC-MS: t=3. 67min., 193.0 (M-1), 195. 1 (M+1). MS: API 150EX. (LC: Agilent I lOOSeries, Column: Phenomenex, 5u ODS3 100A 100X3mm. Flow Rate : 2mli'min. Two solvent gradient : Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% actonitrile, 1% water, 0. 1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.); (b) N-Cvanomethvl-3- (2-difluoromethoxy-phenvlmethanesulfonyl)-propionamide

'H NMR: (CDC13) 7.52 (d, 1H, J=8Hz), 7.43 (t, 1H, J=8Hz), 7.29 (d, 1H, J=8Hz), 7.20 (d, 1H, J=8Hz), 6.40 (m, 1H), 4.41 (s, 2H), 4.16 (d, 2H, J=6Hz), 3.72 (s, 1H), 3.34 (t, 2H, J=8Hz), 2.77 (t, 2H, J=8Hz); LC-MS: t=3.02min., 331.1 (M-1), 333.1 (M+1). MS: API 150EX. (LC: Agilent 1100Series, Column: Phenomenex, 5u ODS3 100A 100X3mm. Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% actonitrile, 1% water, 0.1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.).

(c) 3-(3-Cyclohexyl-propionylamino !-2-oXo-5-phenvl-pentanoic acid thiazol-2-ylamide

data for the compound as drawn and for it's enol and hydrate forms: LC-MS: t=4.74min. 426.4 (M-1), 428.2 (M+1) ; 4.97min, 426.2 (M-1), 428.2 (M+1) ; 5.57min, 426.3 (M-1), 427.9 (M+1). MS: API 150EX. (LC: Agilent 1100Series, Column: Phenomenex, 5u ODS3 100A 100X3mm. Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% acetonitrile, 1% water, 0. 1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.) (d) 3-Cvclovl-N (1-formvl-3-phenvl-propyl)-propionamide LC-MS: t=4.57min., 300.4 (M-1), 302.3 (M+1). MS: API 150EX. (LC: Agilent 1100Series, Column: Phenomenex, 5u ODS3 100A 100X3mm. Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% actonitrile, 1% water, 0.1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 6min. Then gradient back to 100% A, 0% B from t = 7 to t = 15 min.) (f- (2-Difluoromethoxy-phenvlmethanesulfonyl)-N-[ (Sl-1- (5-ethyl- [1, 3, 4] oxadiazole-2- carbonvl)-propvll-propionamide LC-MS: RT =2.32min., 460.3 (M+1) 482.2 (M+23) MS: API 150EX. (LC: Agilent 1100Series, Column: Phenomenex, 5u ODS3 100A 100X3mm. Flow Rate: 2ml/min. Two solvent gradient:

Solvent A, 99% water, 1% acetonitrile, 0.1% AcOH. Solvent B, 99% actonitrile, 1% water, 0.1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 2.5min. Then gradient back to 100% A, 0% B from t = 3.0 to t = 3.5 min. Then gradient held at 100% A, 0% B from t=3. 5 to 5 min.) (g) N [ (S)-1- (Benzooxazole-2-carbonvl)-propyl]-2- (2-cvano-phenylamino)-3-cyclohexvl- propionamide

'H NMR: (CDCI3) 7.83 (d, 1H, J=8Hz), 7.59 (d, 1H, J=8Hz), 7.43-7.58 (m, 2H), 7.02-7.25 (m, 4H), 6.59 (t, 1H, J=8Hz), 6.49 (d, 1H, J=8Hz), 5.40-5.47 (m, 1H), 4.77 (m, 1H), 3.83-3.88 (m, 1H), 2.12-2.22 (m, 1H), 1.85-2.00 (m, 2H), 1.55-1.83 (m. 8H), 1.12-1.35 (m, 4H), 0.95-1.10 (m, 3H); LC-MS : t=2.97min., 457.5 (M-1), 459.3 (M+1), 481.4 (M+23) MS: API 150EX. (LC : Agilent 1100Series,.

Column: Phenomenex, 5u ODS3 100A 100X3mm. Flow Rate: 2ml/min. Two solvent gradient: Solvent A, 99% water, 1% acetonitrile, 0. 1% AcOH. Solvent B, 99% actonitrile, 1% water, 0. 1% AcOH. Gradient from 100% A, 0% B to 0% A, 100% B from t = 0 to t = 2.5min. Then gradient back to 100% A, 0% B from t = 3.0 to t = 3.5 min. Then gradient held at 100% A, 0% B from t=3. 5 to 5 min.) (h) N-Cvanomethyl-3-cyclohexy4-methoxy-phenoxy)-propionamide (Compound 1);'H NMR: (CDC13) 7.42-7.36 (m, 5H), 6.90 (t, 1H), 4.55 (d, 1H), 4.51 (d, 1H), 4.22 (dd, 1H), 4.16 (dd, 1H), 4.00 (t, 1H), 1.70-0.80 (m, 13H); MS: (M+1) 301; (i) 2-Benzyloxv-N-cyanomethyl-3-cvclohexyl-propionamide (Compound 2)

using 2 (R)-benzyloxy-4-phenyl-butyric acid as starting material.'H NMR: (CDC13) 8 6.84-6.80 (m, 4H), 6.75 (t, 1H), 4.55 (dd, 1H), 4.24 (dd, 1H), 4.12 (dd, 1H), 3.78 (s, 3H), 1.80-0.85 (m, 13H); MS: (M-1) 315.

(j) (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-butyl]-2-benzylo xy-3-phenylmethanesulfonyl- propionamide (Compound 3) ;'H NMR: (CDCl3) 7.89 (d, 1H), 7.68 (d, 1H), 7.60-7.32 (m, 13H), 5.70 (m, 1H), 4.79 (d, 1H), 4.77 (d, 1H), 4.53 (dd, 1H), 4.33 (d, 1H), 4.30 (d, 1H), 3.38 (dd, 1H), 3.25 (dd, 1H), 2.15-2.05 (m, 1H), 1.84-75 (m, 1H), 1.45-1.30 (m, 2H), 0.93 (t, 3H); MS: (M++1) 535, (M-1) 533; (k) (R)-N-[ (S-1- (1-benzooxazol-2-yl-methanovl)-propvl]-2-methoxymethoxv- 3-phenelmethanesulfonvl-propionamide (Compound 9);'HNMR (DMSO): 8.87 (d, J=6.91Hz, 1H), 7.99 (d, J=7.91Hz, 1H), 7.89 (d, J=8.15Hz, 1H), 7.64 (t, J=8. 1Hz, 1H), 7.54 (t, J=8. 1Hz, 1H), 7.4-7.3 (m, 5H), 5.3-5.2 (m, 1H), 4.7-4.65 (m, 1H), 4.65-4.63 (m, 2H), 4.55-4.50 (m, 2H), 3.53-3.26 (m, 2H), 3.34 (s, 3H), 2.11-1.98 (m, 1H), 1.81-1.69 (m, 1H), 0.97 (t, J=7.15Hz, 3H); MS: 473 (M-1), 497 (M+23); (1) (S)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-butyl]-2-hydroxy -3-phenyl-propionamide (Compound 10); (m) (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-3-phenyl methanesulfonyl-2- thisopropvtsilanyloxv-propionamide (Compound 12) ;'HNMR (CD3Cl) : 7. 93(d, J=8.15Hz, 1H), 7.6(d, J=8. 1Hz, 1H), 7.6-7.4 (m, 3H). 7.4-7.3 (m, 5H), 5.85-5.73 (m, 1H), 4.85-4.74 (m, 1H), 4.5-4.3 (m, 2H), 3.47-3.35 (m, 2H), 2.35-2.15 (m, 1H), 2.15-1.95 (m, 1H), 1.3-0.8 (m, 24H); MS : 609.4 (M+23) ; (n) (R)-N [ (S1-1- (1-benzothiazol-2-vl-methanoyl)-propvl]-2-hv-3-phenylmethane sulfonyl- propionamide (Compound 13);'HNMR (CD3CI) : 8.21 (d, J=8.67Hz, 1H), 7.98 (d, J=8.6Hz, 1H), 7.7- 7.55 (m, 3H), 7.45-7.3 (m, 5H), 5.8-5.7 (m, 1H), 4.75-4.6 (m, 1H), 4.4-4. 3 (m, 2H), 4.08 (br, 1H), 3.62- 3.5 (m, 1H), 3.3-3.1 (m, 1H), 2. 3-2. 15 (m, 1H), 2.05-1.9 (m, 1H), 0.997 (t, J=7.4Hz, 3H); MS: 469.2(M+23); (o) (R)-2-hydroxy-3 !-2-hydroxy-3-phenvlmethanesulfonvl-N-r (S !-l-(l-pvridazin-3-vl-methanovl)-butyl]- propionamide (Compound 16);'HNMR (CD3CI) : 9.35 (dd, J=4.93Hz, J=1.72Hz, 1H), 8.14 (dd, J=1.72Hz, J=8.39Hz, 1H), 7.69 (dd, J=4.93Hz, J=8.39Hz, 1H), 7.65 (d, J=7.6Hz, 1H), 7.5-7.36 (m, 5H), 6.04-5.96 (m, 1H), 4.75-4.63 (m, 1H), 4.45-4.3 (m, 3H), 3.53 (dd, J=2. 48Hz, J=14.85Hz, 1H), 3.22 (dd, J=14.82Hz, J=2.48Hz, 1H), 2.2-2.07 (m, 1H), 1.81-1.65 (m, 1H), 1.6-1.2 (m, 2H), 0.93 (t, J=7.18Hz, 3H); MS: 403.6 (M-1), 428 (M+23); (p) (S)-3-((R)-2-hydroxy-3-phenylmethanesulfonyl-propanoylamino) -2-oxo-pentanoic acid benzylamide (Compound 18) ;'HNMR (CD3CI) : 7.45-7.25 (m, IOH), 5.34-5.26 (m, 1H), 4.7-4.6 (m,

1H), 4.47 (d, J=6.18Hz, 2H), 4.4-4.3 (m, 2H), 4.15-4.05 (m, 1H), 3.55-3.45 (m, 1H), 3.25-3.13 (m, 1H), 22.2-2.0 (m, 1H), 1.8-1.6 (m, 1H), 1.61 (s, 2H), 0.95 (t, J=6.91Hz, 3H); MS: 469.2 (M+23); (q) (R [ (S)-1- (1-benzooxazol-2-vl-methanovl)-propvll-3-f2- (1, 1-difluoro-methoxv- phenylmethanesulfonvl]-2-hvdroxy-propionamide (Compound 21) ;'HNMR (CD3CI) : 7.91 (d, J=7.91Hz, 1H), 7.75 (d, J=7.9Hz, 1H), 7.7-7.2 (m, 6H), 6.63 (t, J=73.41Hz, 1H), 5.7-5.58 (m, 1H), 5.4- 5.29 (m, 1H), 4.7-4.6 (m, 1H), 4.51 (s, 2H), 4.19 (br, 1H), 3.72-3.63 (m, 1H), 3. 35-3. 2 (m, 1H), 2.3-2.0 (m, 1H), 2.0-1.7 (m, 1H), 0.99 (t, J=6.9Hz, 3H); MS: 495.5 (M-1), 497.2 (M+1); (r) (R)-N-r (S)-1-(1-benzothiazol-2-el-methanovI)-propvll-3-r2-(11-diflu oro-methoxy)- phenylmethanesulfonel]-2-hydroxy-propionamide (Compound 22) ;'HNMR (CD3CI) : 8.21 (d, J=8.15Hz, 1H), 7.99 (d, J=8. 1Hz, 1H), 7.73-7.2 (m, 6H), 6.63 (t, J=73.4Hz, 1H), 5.85-5.75 (m, 1H), 5.3 (s, 1H), 4.78-4.7 (m, 1H), 4.56-4.4 (m, 2H), 4.19-4.09 (m, 1H), 3.7-3.6 (m, 1H), 3.35-3.2 (m, 1H), 2.28 (s, 2H), 1.27 (t, J=6.9Hz, 3H); MS; 511.4 (M-1), 513.6 (M+1) ; and (s) (2R, 5S)-2-[2-(1,1-difluoro-methoxy)-phenylmethanesulfonylmethyl] -6-ethoxy-5- ethyl-morpholin-3-one (Compound 24).

ENZYME ASSAY EXAMPLE- Cathepsin S Assay Solutions of test compounds in varying concentrations were prepared in 10 L of dimethyl sulfoxide (DMSO) and then diluted into assay buffer (40 1L, comprising: MES, 50 mM (pH 6.5); EDTA, 2.5 mM ; and NaCl, 100 mM). Human cathepsin S (0.158 pMoles in 25 IAL of assay buffer) was added to the dilutions. The assay solutions were mixed for 5-10 seconds on a shaker plate, covered and incubated for 30 minutes at ambient temperature. Z-Val-Val-Arg-AMC (9 nMoles in 25 pL of assay buffer) was added to the assay solutions and hydrolysis was followed spectrophotometrically at (# 460 nm) for 5 minutes. Apparent inhibition constants (Ks) were calculated from the enzyme progress curves using standard mathematical models.

ENZYME ASSAY EXAMPLE Cathepsin B Assay Solutions of test compounds in varying concentrations were prepared in 10 uL of dimethyl sulfoxide (DMSO) and then diluted into assay buffer (40 µL, comprising: N, N-bis (2-hydroxyethyl)-2-aminoethanesulfonic acid (BES), 50 mM (pH 6); polyoxyethylenesorbitan monolaurate, 0.05%; and dithiothreitol (DTT), 2.5 mM).

Human cathepsin B (0.025 pMoles in 25 uL of assay buffer) was added to the dilutions. The assay solutions were mixed for 5-10 seconds on a shaker plate, covered and incubated for 30 minutes at ambient temperature. Z- FR-AMC (20 nMoles in 25 liL of assay buffer) was added to the assay solutions and hydrolysis was followed

spectrophotometrically at (k 460 nm) for 5 minutes. Apparent inhibition constants (Ks) were calculated from the enzyme progress curves using standard mathematical models.

ENZYME ASSAY EXAMPLE Cathepsin K Assay Solutions of test compounds in varying concentrations were prepared in 10 jiL of dimethyl sulfoxide (DMSO) and then diluted into assay buffer (40 1L, comprising: MES, 50 mM (pH 5.5); EDTA, 2.5 mM ; and DTT, 2.5 mM). Human cathepsin K (0.0906 pMoles in 25 pL of assay buffer) was added to the dilutions. The assay solutions were mixed for 5-10 seconds on a shaker plate, covered and incubated for 30 minutes at ambient temperature. Z-Phe-Arg-AMC (4 nMoles in 25 pL of assay buffer) was added to the assay solutions and hydrolysis was followed spectrophotometrically at (k 460 nm) for 5 minutes. Apparent inhibition constants (Ks) were calculated from the enzyme progress curves using standard mathematical models.

ENZYME ASSAY EXAMPLE Cathepsin L Assay Solutions of test compounds in varying concentrations were prepared in 10 uL of dimethyl sulfoxide (DMSO) and then diluted into assay buffer (40 p1L, comprising: MES, 50 mM (pH 5.5); EDTA, 2.5 mM ; and DTT, 2.5 mM). Human cathepsin L (0.05 pMoles in 25 uL of assay buffer) was added to the dilutions. The assay solutions were mixed for 5-10 seconds on a shaker plate, covered and incubated for 30 minutes at ambient temperature. Z-Phe-Arg-AMC (1 nMoles in 25 tiL of assay buffer) was added to the assay solutions and hydrolysis was followed spectrophotometrically at (# 460 nm) for 5 minutes. Apparent inhibition constants (Kj) were calculated from the enzyme progress curves using standard mathematical models.

According to applicants'assays conducted as described above, the apparent inhibition constants (Ki) for the following listed compoundsof the invention, against Cathepsin S, were about or below 0.01 uM : morpholine-4-carboxylic acid (R)-1- (cyanomethyl-carbamoyl)-2- [2- (1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-ethyl ester, (Compound 31), Example 3 (a); morpholine-4-carboxylic acid (R)-1-[(@-1-(1-benzooxazol-2-yl-methanoyl)-propylcarbamoyl]- 2- phenylmethanesulfonyl-ethyl ester, (Compound 11), Example 4 (a); morpholine-4-carboxylic acid (R)-1-[(2-1-(1-benzooxazol-2-yl-methanoyl)-propylcarbamoyl]- 2-[2- (1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-ethyl ester, (Compound 14), Example 4 (b); morpholine-4-carboxylic acid (R)-1-[(2-1-(1-benzothiazol-2-yl-methanoyl)-propylcarbamoyl] -2-[2- (1, 1-difluoro-methoxy)-phenylmethanesulfonyl]-ethyl ester, (Compound 15), Example 4 (c); pyrrolidine-1-carboxylic acid (R)-1-[(@-1-(1-benzooxazol-2-yl-methanoyl)-propylcarbamoyl]- 2- phenylmethanesulfonyl-ethyl ester, (Compound 19). Example 4 (d);

dimethyl-carbamic acid (R)-1-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propylcarbamoyl] -2- phenylmethanesulfonyl-ethyl ester, (Compound 20)., Example 4 (e); morpholine-4-carboxylic acid (R)-1-[(S)-1-(1-benzylcarbamoyl-methanoyl)-propylcarbamoyl]- 2 phenylmethanesulfonyl-ethyl ester, (Compound 25). Example 4 (f) ; morpholine-4-carboxylic acid (S)-1-[(S)-1-(oxazolo [4,5-b] pyridine-2-carbonyl)-propylcarbamoyl] 2-phenylmethanesulfonyl-ethyl ester, Example 4 (g); morpholine-4-carboxylic acid (S)-1-[(S)-1-(5-ethyl-[1, 3,4] oxadiazole-2-carbonyl)-propylcarbamoyl]- 2-phenylmethanesulfonyl-ethyl ester, Example 4 (h); (R)-3-[2-(1, I-difluoro-methoxy)-phenylmethanesulfonyl]-N-((S)-1-formyl-p ropyl)-2-hydroxy- propionamide. (Compound 23), Example 6; (R)-N-[(55-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-2-hydrox y-3-phenyl-methanesulfonyl- propionamide, (Compound 5), Example 7; (S)-3-{3-[2-(1,1-difluoro-methoxy)-phenylmethanesulfonyl]-pr opanoylamino}-3-oxo-pentanoic acid benzylamide, (Compound 27), Example 8 (a); (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-2-(2-nit ro-phenylamino)-3- phenylmethanesulfonyl-propionamide, (Compound 28), Example 9; (R)-N-[(S)-1-(l-benzooxazol-2-yl-methanoyl)-butyl]-2 (5-nitro-thiazol-2-ylamino)-3- phenylmethanesulfonyl-propionamide, (Compound 29), Example 10; (R)-N-[(S)-I-(benzoxazole-2-carbonyl)-butyl]-3-phenylmethane sulfonyl-2-(tetrahydro-pyran-4- ylamino)-propionamide ; Example 19 (a); (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-isopropylamin o-3-phenylmethanesulfonyl propionamide, Example 21 (a); (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-[(2-methoxy-e thyl)-(tetrahydro-pyran-4-yl)-amino]-3- phenylmethanesulfonyl-propionamide, Example 21 (b); (R)-N-[(S)-1-(benzoxazole-2-carbonyl)-butyl]-2-cyclohexylami no-3-phenylmethanesulfonyl- propionamide, Example 21 (c); morpholine-4-carboxylic acid (S)-2-cycloheXyl-1-[(S)-l-(oxazolo [4,5-b] pyridine-2-carbonyl)- propylcarbamoyl]-ethyl ester, Example 24 (b); 3-(2-difluoromethoxy-phenylmethanesulfonyl)-N-[(S)-1-(oxazol o [4,5-b] pyridine-2-carbonyl)-propyl]- propionamide, Example 33 (e); (S)-3-((R)-2-hydroxy-3-phenylmethanesulfonyl-propanoylamino) -2-oxo-pentanoic acid benzylamide (Compound 18), Example 33 (p); (R)-N-[(S)-1-(1-benzooxazol-2-yl-methanoyl)-propyl]-3-[2-(1, 1-difluoro-methoxy)- phenylmethanesulfonyl]-2-hydroxy-propionamide (Compound 21), Example 33 (q) ; Moreover, the compounds of the present invention were observed to have varying degrees of selective inhibitory action on cathepsin S protease. For example, the above listed 22 compounds were found to inhibit cathepsin S protease activity at concentrations that are more than 75 fold less than those concentrations required to produce an equiactive inhibition on cathepsin K protease.

EXAMPLE Representative Pharmaceutical Formulations Containing a Compound of Formula I ORAL FORMULATION Compound of Formula I 10-100 mg Citric Acid Monohydrate 105 mg Sodium Hydroxide 18 mg Flavoring Water q. s. to 100 mL INTRAVENOUS FORMULATION Compound of Formula I 0.1-10 mg Dextrose Monohydrate q. s. to make isotonic Citric Acid Monohydrate 1.05 mg Sodium Hydroxide 0.18 mg Water for Injection q. s. to 1.0 mL TABLET FORMULATION Compound of Formula I 1% Microcrystalline Cellulose 73% Stearic Acid 25% Colloidal Silica 1%.