INDOLIN-2-ONE DERIVATIVES

The present invention is concerned with indolin-2-one derivatives of general formula

wherein

A is phenyl or a six membered heteroaryl group, containing one or two N atoms, selected from

or the amine group -NR 1 R2 may form together with two neighboring carbon atoms from the group A an additional fused ring, selected from

are independently from each other hydrogen, C(0)-lower alkyl, cycloalkyl, -(CH ₂ )2-lower alkoxy, lower alkyl or oxetanyl;

or R 1 and R 2" ma form together with the N atom to which they are attach the group

R is hydrogen or lower alkyl;

as well as with a pharmaceutically acceptable salt thereof, with a racemic mixture, or with its corresponding enantiomer and/or optical isomer and/or stereoisomer thereof.

The amine group NR 1 R2 and R 3 ^J may have different positions on A.

Now it has been found that the compounds of formula I may be used for the treatment of CNS diseases. The described compounds have been shown to reverse the L-687,414 ((3R,4R)-3 amino- l-hydroxy-4-methyl-pyrrolidin-2-one, a NMD A glycine site antagonist) induced hyperlocomotion, a behavioral pharmacodynamic mouse model for schizophrenia, described by D. Alberati et al. in Pharmacology, Biochemistry and Behavior, 97 (2010), 185 - 191. The authors described that hyperlocomotion induced by L-687,414 was inhibited by a series of known antipsychotic drugs. The compounds of formula I demonstrate marked activity in this model. These findings predict antipsychotic activity for the present compounds, making them useful for the treatment of positive (psychosis) and negative symptoms of schizophrenia, substance abuse, alcohol and drug addiction, obsessive-compulsive disorders, cognitive impairment, bipolar disorders, mood disorders, major depression, resistant depression, anxiety disorders, Alzheimer's disease, autism, Parkinson's disease, chronic pain, borderline personality disorder, sleep disturbances, chronic fatigue syndrome, stiffness, antiinflammatory effects in arthritis and balance problems, and treatment of epilepsy and neurodevelopmental disorders with co-morbid epilepsy.

In addition to the reversal of L-687,414 induced hyperlocomotion experiment as described above, some compounds of the present invention have been tested in SmartCube , an automated system in which the behaviors of compound-treated mice in response to multiple challenges are captured by digital video and analyzed with computer algorithms {Roberds et al., Frontiers in Neuroscience, 2011, Vol. 5, Art. 103, 1-4; Vadim Alexandrov, Dani B runner, Taleen Hanania, Emer Leahy Eur. J. Pharmacol. 2015, 750, 82-99). In this way, the neuro-pharmacological effects of a test compound can be predicted by similarity to major classes of compounds, such as antipsychotics, anxiolytics and antidepressants. Examples 1, 3, 15, 18, 20, 39, 50 and 54 show similarity to atypical antipsychotics. The results are shown in Table 3.

In addition to the above-mentioned experiments, it has been shown that some of the compounds of formula I are also ENT1 inhibitors (equilibrative nucleoside transporter 1 protein).

Therapeutic potential of ENT1 inhibitors is directly or indirectly (via effects of adenosine and/or adenosine receptor modulation) described in the literature for the treatment of the following diseases:

autoimmune disease (US 2006/253263), cancer (W09857643), viral infections and fungal infections (WO2004060902), neurodegenerative disease, Parkinson's disease, Alzheimer's disease, Huntington's disease, amyotrophic lateral sclerosis, psychiatric diseases, substance abuse, ADHD, depression, epilepsy, anxiety, schizophrenia (WO0168105, EP 1252910,

EP1612210, WO2009018275), autism spectrum disorders (Susan A. Masinoa, Masahito

Kawamura Jr., Jessica L. Cotea, Rebecca B. Williams, David N. Ruskina, Neuropharmacology, 2013, 68, 116-121., pain (W 02009062990, W 02009064497), inflammation, asthma, (US

2007213296, Inflammation research, 2011, 60, 75-76), cardiovascular diseases (Trends in Pharmacological science, 2006, 27, 416-425), sleep disorders, (Psychopharmacology, 1987, 91, 434-439), and ophthalmology and inflammatory retinal diseases (World Journal of Diabetes, vol. 1, 12 - 18), epilepsy and neurodevelopmental disorders with co-morbid epilepsy (ENTl

Inhibition Attenuates Epileptic Seizure Severity Via Regulation of Glutamatergic

Neurotransmission, Xu et al, Neuromol Med (2015) 17:1-11 and Epi gene tic changes induced by adenosine augmentation therapy prevent epileptogenesis, Williams- Karnesky et al

J Clin Invest. 2013 Aug;123(8):3552-63.

Schizophrenia is a complex mental disorder typically appearing in late adolescence or early adulthood with a world-wide prevalence of approximately 1 % of the adult population, which has enormous social and economic impact. The criteria of the Association of European Psychiatrists (ICD) and the American Psychiatric Association (DSM) for the diagnosis of schizophrenia require two or more characteristic symptoms to be present: delusions, hallucinations, disorganized speech, grossly disorganized or catatonic behavior (positive symptoms), or negative symptoms (alogia, affective flattening, lack of motivation, anhedonia). As a group, people with schizophrenia have functional impairments that may begin in childhood, continue throughout adult life and make most patients unable to maintain normal employment or otherwise have normal social function. They also have a shortened lifespan compared to the general population, and suffer from an increased prevalence of a wide variety of other neuropsychiatric syndromes, including substance abuse, obsessive-compulsive symptoms and abnormal involuntary movements. Schizophrenia is also associated with a wide range of cognitive impairments, bipolar disorders, major depression and anxiety disorders, the severity of which limits the functioning of patients, even when psychotic symptoms are well controlled. The primary treatment of schizophrenia is antipsychotic medications. Antipsychotics, for example risperidone and olanzapine, however, fail to significantly ameliorate the negative symptoms and cognitive dysfunction.

Antipsychotic drugs have shown clinical efficacy for the treatment of the following diseases:

Fibromyalgia, which is a syndrome characterized by chronic generalized pain associated with different somatic symptoms, such as sleep disturbances, fatigue, stiffness, balance problems, hypersensitivity to physical and psychological environmental stimuli, depression and anxiety (CNS Drugs, 2012, 26, 2, 135-53).

Schizoaffective disorders: includes psychotic and affective symptoms, this disorder falls on a spectrum between bipolar disorders (with depressive and manic episodes, alcohol and drug addiction, substance abuse) and schizophrenia. J. Clin. Psychiatry, 2010, 71, S2, 14-9,

Pediatr. Drugs 2011, 13, 5, 291-302

Major depression: BMC Psychiatry 2011, 11, 86

Treatment resistent depression: Journal of Psychopharmacology, 0(0) 1- 16

Anxiety: European Neuropsychopharmacology, 2011, 21, 429-449 Bipolar disorders: Encephale, International J. of Neuropsychopharmacology, 2011, 14, 1029- 104, International J . of Neuropsychopharmacology, 2012, 1-12; J. of

Neuropsychopharmacology, 2011, 0, 0, 1- 15

Mood disorders: J. Psychopharmacol. 2012, Jan 11, CNS Drugs, 2010, 2, 131-61

Autism: Current opinion in pediatrics, 2011, 23, 621 - 627; J. Clin. Psychiatry, 2011, 72, 9,

1270-1276

Alzheimer's disease: J. Clin. Psychiatry, 2012, 73, I, 121-128

Parkinson's disease: Movement Disorders, 2011, 26, 6

Chronic fatigue syndrome: European Neuropsychopharmacology, 2011, 21, 282-286

Borderline Personality disorder: J. Clin. Psychiatry, 2011, 72, 10, 1363-1365

/. Clin. Psychiatry, 2011, 72, 10, 1353-1362

Anti-inflammatory effects in arthritis: European J. of Pharmacology, 2012, 678, 55-60

Objects of the present invention are novel compounds of formula I and the use of compounds of formula I and their pharmaceutically acceptable salts for the treatment of CNS diseases related to positive (psychosis) and negative symptoms of schizophrenia, substance abuse, alcohol and drug addiction, obsessive-compulsive disorders, cognitive impairment, bipolar disorders, mood disorders, major depression, treatment resistant depression, anxiety disorders, Alzheimer's disease, autism, Parkinson's disease, chronic pain, borderline personality disorder, neurodegenerative disease, sleep disturbances, chronic fatigue syndrome, stiffness, inflammatory disease, asthma, Huntington's disease, ADHD, amyotrophic lateral sclerosis, arthritis, autoimmune disease, viral and fungal infections, cardiovascular diseases, ophthalmology and inflammatory retinal diseases and balance problems, epilepsy and neurodevelopmental disorders with co-morbid epilepsy.

Further objects of the present invention are medicaments containing such novel compounds as well as methods for preparation of compounds of formula I, a combination of compounds of formula I with marketed antipsychotics, antidepressants, anxiolytics or mood stabilizers, and methods for the treatment of CNS disorders as mentioned above.

Encompassed by the present invention are corresponding prodrugs of compounds of formula I. A common antipsychotic drug for the treatment of schizophrenia is olanzapine.

Olanzapine (Zyprexa) belongs to a drug class known as atypical antipsychotics. Other members of this class include for example clozapine (Clozaril), risperidone (Risperdal), aripiprazole (Abilify) and ziprasidone (Geodon).

Olanzapine is approved for the treatment of psychotic disorders, long term treatment of bipolar disorders and in combination with fluoxetine for the treatment of depressive episodes associated with bipolar disorders and for the treatment of resistant depression.

The compounds of the present invention may be combined with antipsychotic drugs like olanzapine (Zyprexa), clozapine (Clozaril), risperidone (Risperdal), aripiprazole (Abilify), amisulpride (Solian), asenapine (Saphris), blonanserin (Lonasen), clotiapine (Entumine), iloperidone (Fanapt), lurasidone (Latuda), mosapramine (Cremin), paliperidone (Invega), perospirone (Lullan), quetiapine (Seroquel), remoxipride (Roxiam), sertindole (Serdolect), sulpiride (Sulpirid, Eglonyl), ziprasidone (Geodon, Zeldox), zotepine (Nipolept), haloperidol (Haldol, Serenace), droperidol (Droleptan), chlorpromazine (Thorazine, Largactil), fluphenazine (Prolixin), perphenazine (Trilafon), prochlorperazine (Compazine), thioridazine (Mellaril, Melleril), trifluoperazine (Stelazine), triflupromazine (Vesprin), levomepromazine (Nozinan), promethazine (Phenergan), pimozide (Orap) and cyamemazine (Tercian).

One preferred embodiment of the invention is a combination, wherein the marketed antipsychotic drug is olanzapine (Zyprexa), clozapine (Clozaril), risperidone (Risperdal), aripiprazole (Abilify) or ziprasidone.

Furthermore, the compounds of the present invention can be combined with

antidepressants such as selective serotonin reuptake inhibitors [Citalopram (Celexa),

Escitalopram (Lexapro, Cipralex), Paroxetine (Paxil, Seroxat), Fluoxetine (Prozac), Fluvoxamine (Luvox), Sertraline (Zoloft, Lustral)], serotonin-norepinephrine reuptake inhibitors [Duloxetine (Cymbalta), Milnacipran (Ixel, Savella), Venlafaxine (Effexor), Desvenlafaxine (Pristiq), Tramadol (Tramal, Ultram), Sibutramine (Meridia, Reductil)], serotonin antagonist and reuptake inhibitors [Etoperidone (Axiomin, Etonin), Lubazodone (YM-992, YM-35,995), Nefazodone (Serzone, Nefadar), Trazodone (Desyrel)], norepinephrine reuptake inhibitors [Reboxetine (Edronax), Viloxazine (Vivalan), Atomoxetine (Strattera)], norepinephrine-dopamine reuptake inhibitors [Bupropion (Wellbutrin, Zyban), Dexmethylphenidate (Focalin), Methylphenidate (Ritalin, Concerta)], norepinephrine-dopamine releasing agents [Amphetamine (Adderall), Dextroamphetamine (Dexedrine), Dextromethamphetamine (Desoxyn), Lisdexamfetamine (Vyvanse)], tricyclic antidepressants [Amitriptyline (Elavil, Endep), Clomipramine (Anafranil), Desipramine (Norpramin, Pertofrane), Dosulepin [Dothiepin] (Prothiaden), Doxepin (Adapin, Sinequan), Imipramine (Tofranil), Lofepramine (Feprapax, Gamanil, Lomont), Nortriptyline (Pamelor), Protriptyline (Vivactil), Trimipramine (Surmontil)], tetracyclic antidepressants

[Amoxapine (Asendin), Maprotiline (Ludiomil), Mianserin (Bolvidon, Norval, Tolvon), Mirtazapine (Remeron)], monoamine oxidase inhibitors [Isocarboxazid (Marplan), Moclobemide (Aurorix, Manerix), Phenelzine (Nardil), Selegiline [L-Deprenyl] (Eldepryl, Zelapar, Emsam), Tranylcypromine (Parnate), Pirlindole (Pirazidol)] , 5-HT1A Receptor Agonists [Buspirone (Buspar), Tandospirone (Sediel), Vilazodone (Viibryd)], 5-HT2 Receptor Antagonists

[Agomelatine (Valdoxan), Nefazodone (Nefadar, Serzone), selective Serotonin Reuptake Enhancers [Tianeptine].

A preferred embodiment of this invention is a combination, wherein the marketed anti-depressive drug is citalopram (Celexa), escitalopram (Lexapro, Cipralex), paroxetine (Paxil, Seroxat), fluoxetine (Prozac), sertraline (Zoloft, Lustral) duloxetine (Cymbalta), milnacipran (Ixel, Savella), venlafaxine (Effexor), or mirtazapine (Remeron).

Compounds can also be combined with anxiolytics such as Alprazolam (Helex, Xanax, Xanor, Onax, Alprox, Restyl, Tafil, Paxal), Bretazenil, Bromazepam (Lectopam, Lexotanil, Lexotan, Bromam), Brotizolam (Lendormin, Dormex, Sintonal, Noctilan),

Chlordiazepoxide (Librium, Risolid, Elenium), Cinolazepam (Gerodorm), Clonazepam (Rivotril, Klonopin, Iktorivil, Paxam), Clorazepate (Tranxene, Tranxilium), Clotiazepam (Veratran, Clozan, Rize), Cloxazolam (Sepazon, Olcadil), Delorazepam (Dadumir), Diazepam (Antenex, Apaurin, Apzepam, Apozepam, Hexalid, Pax, Stesolid, Stedon, Valium, Vival, Valaxona), Estazolam (ProSom), Etizolam (Etilaam, Pasaden, Depas), Flunitrazepam (Rohypnol, Fluscand, Flunipam, Ronal, Rohydorm), Flurazepam (Dalmadorm, Dalmane), Flutoprazepam (Restas), Halazepam (Paxipam), Ketazolam (Anxon), Loprazolam (Dormonoct), Lorazepam (Ativan, Temesta, Tavor, Lorabenz), Lormetazepam (Loramet, Noctamid, Pronoctan), Medazepam (Nobrium), Midazolam (Dormicum, Versed, Hypnovel, Dormonid), Nimetazepam (Erimin), Nitrazepam (Mogadon, Alodorm, Pacisyn, Dumolid, Nitrazadon), Nordazepam (Madar, Stilny), Oxazepam (Seresta, Serax, Serenid, Serepax, Sobril, Oxabenz, Oxapax), Phenazepam

(Phenazepam), Pinazepam (Domar) , Prazepam (Lysanxia, Centrax), Premazepam, Quazepam (Doral), Temazepam (Restoril, Normison, Euhypnos, Temaze, Tenox), Tetrazepam (Mylostan), Triazolam (Halcion, Rilamir), Clobazam (Frisium, Urbanol), Eszopiclone (Lunesta), Zaleplon (Sonata, Starnoc), Zolpidem (Ambien, Nytamel, Stilnoct, Stilnox, Zoldem, Zolnod), Zopiclone (Imovane, Rhovane, Ximovan; Zileze; Zimoclone; Zimovane; Zopitan; Zorclone), Pregabalin (Lyrica) and Gabapentin (Fanatrex, Gabarone, Gralise, Neurontin, Nupentin).

One preferred embodiment of the invention is a combination, wherein the marketed anxiolytic drug is alprazolam (Helex, Xanax, Xanor, Onax, Alprox, Restyl, Tafil, Paxal), chlordiazepoxide (Librium, Risolid, Elenium), clonazepam (Rivotril, Klonopin, Iktorivil, Paxam), diazepam (Antenex, Apaurin, Apzepam, Apozepam, Hexalid, Pax, Stesolid, Stedon, Valium, Vival, Valaxona), Estazolam (ProSom), eszopiclone (Lunesta), zaleplon (Sonata, Starnoc), Zolpidem (Ambien, Nytamel, Stilnoct, Stilnox, Zoldem, Zolnod), pregabalin (Lyrica) or gabapentin (Fanatrex, Gabarone, Gralise, Neurontin, Nupentin).

A further object of the invention is a combination with mood stabilizers such as

Carbamazepine (Tegretol), Lamotrigine (Lamictal), Lithium (Eskalith, Lithane, Lithobid), and Valproic Acid (Depakote).

Compounds can also be combined with procognitive compounds such as donepezil (Aricept), galantamine (Razadyne), rivastigmine (Exelon) and memantine (Namenda).

The preferred indications using the compounds of the present invention are psychotic diseases like schizophrenia.

As used herein, the term "lower alkyl" denotes a saturated straight- or branched-chain group containing from 1 to 7 carbon atoms, for example, methyl, ethyl, propyl, isopropyl, n- butyl, i-butyl, 2-butyl, t-butyl and the like. Preferred alkyl groups are groups with 1 - 4 carbon atoms.

As used herein, the term "lower alkoxy" denotes an alkyl group as defined above, wherein the alkyl residue is attached via an oxygen atom.

The term "cycloalkyl" denotes an alkyl ring with 3 - 6 carbon ring atoms.

The term "pharmaceutically acceptable acid addition salts" embraces salts with inorganic and organic acids, such as hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, citric acid, formic acid, fumaric acid, maleic acid, acetic acid, succinic acid, tartaric acid, methane- sulfonic acid, p-toluenesulfonic acid and the like.

One embodiment of the invention are compounds of formula IA

wherein

R 1/R 2 are independently from each other hydrogen, C(0)-lower alkyl, cycloalkyl, -(CH ₂ )2-lower alkoxy, lower alkyl or oxetanyl;

or R 1 and R 2" ma form together with the N atom to which they are attach the group

R is hydrogen or lower alkyl;

and wherein the amine group NR 1 R2 may also be in p-position and R 3 may be in meta position, as well as a pharmaceutically acceptable salt thereof, a racemic mixture, or its

corresponding enantiomer and/or optical isomer and/or stereoisomer thereof, for example the compounds

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(6-morpholinopyraz in-2-yl)indolin-2-one l-(6-aminopyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5- yl)indolin-2-one

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(6-(2-oxopyrrolidi n-l-yl)pyrazin-2-yl)indolin-2-one

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(6-(pyrrolidin- l-yl)pyrazin-2-yl)indolin-2-one

N-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindoli n-l-yl)pyrazin-2-yl)acetamide

1- (6-(4,4-difluoropiperidin-l-yl)pyrazin-2-yl)-3,3-dimethyl-6- (2-methylpyrimidin-5-yl)indolm

2- one

l-(6-(cyclopropylamino)pyrazin-2-yl)-3,3-dimethyl-6-(2-me thylpyrimidin-5-yl)indolin-2-one l-[6-(2-methoxyethylamino)pyrazin-2-yl]-3,3-dimethyl-6-(2-me thylpyrimidin-5-yl)indol-2-one 1 -(6-(4-hydroxypiperidin- 1 -yl)pyrazin-2-yl)-3 ,3-dim

one

1- (6-(l,l-dioxidothiomorpholino)pyrazin-2-yl)-3,3-dimethyl-6-( 2-methylpyrimidin-5-yl)ind

2- one

l-(6-(4-hydroxy-4-methylpiperidin-l-yl)pyrazin-2-yl)-3,3- dimethyl-6-(2-methylpyrimidin^ yl)indolin-2-one

l-(6-((2-methoxyethyl)(methyl)aniino)pyrazin-2-yl)-3,3-di methyl-6-(2-methylpyrimidin-5- yl)indolin-2-one

l-(6-((lR,5S)-3-oxa-6-azabicyclo[3.1.1]heptan-6-yl)pyrazi n-2-yl)-3,3-dimethyl-6-(2- methylpyrimidin-5-yl)indolin-2-one

l-(6-(6-oxa-l-azaspiro[3 ]heptan-l-yl)pyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin -5- yl)indolin-2-one

3- (6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-y l)pyrazin-2-yl)oxazolidin-2-one l-(6-((lR,5S)-6-oxa-3-azabicyclo[3.1.1]heptan-3-yl)pyrazin-2 -yl)-3,3-dimethyl-6-(2- methylpyrimidin-5-yl)indolin-2-one

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(6-(oxetan-3-ylani ino)pyrazin-2-yl)indolin-2-one 3,3-dimethyl-l-(5-methyl-6-morpholinopyrazin-2-yl)-6-(2-meth ylpyrimidin-5-yl)indolin-2-

1- (6-((2-methoxyethyl)amino)-5-methylpyrazin-2-yl)-3,3-dimethy l-6-(2-methylpyrimidin-5- yl)indolin-2-one

3-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l -yl)-3-methylpyrazin-2- yl)oxazolidin-2-one

(R)-3-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindol in-l-yl)pyrazin-2-yl)-4- isopropyloxazolidin-2-one

(S)-3-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindol in-l-yl)pyrazin-2-yl)-4- isopropyloxazolidin-2-one

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(5-morpholinopyraz in-2-yl)indolin-2-one

3 ,3 -dimethyl- 1 -(5 -(2-methyl- 1 H-intidazol- 1 -yl)^

2- one

l-(5-((lR,5S)-3-oxa-6-azabicyclo[3.1.1]heptan-6-yl)pyrazi n-2-yl)-3,3-dimethyl-6-(2- methylpyrimidin-5-yl)indolin-2-one l-(5-((2-hydroxyethyl)amino)pyrazin-2-yl)-3,3^

one

rac-(lS,5R)-4-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl) -2-oxoindolin-l-yl)pyrazin-2-yl)-2- oxa-4-azabicyclo [3.2.0]heptan-3-one

3-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l -yl)pyrazin-2-yl)-5,5- dimethyloxazolidin-2-one or

l-(6-(l,l-dioxidoisothiazolidin-2-yl)pyrazin-2-yl)-3,3-di methyl-6-(2-methylpyrimidin-5 yl)indolin-2-one.

One embodiment of the invention are compounds of formula IB

wherein

R 17R 2 are independently from each other hydrogen, C(0)-lower alkyl, cycloalkyl, -(CH ₂ )2-lower alkoxy, lower alkyl or oxetanyl;

or R 1 and R 2" ma form together with the N atom to which they are attached the group

R is hydrogen or lower alkyl;

and wherein the amine group NR 1 R2 and R 3 may be in other positions,

as well as a pharmaceutically acceptable salt thereof, a racemic mixture, or its

corresponding enantiomer and/or optical isomer and/or stereoisomer thereof, for example the compound

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(4-morpholinopyrim idin-2-yl)indolin-2-one. One embodiment of the invention are compounds of formula IC

wherein

R 1/R 2 are independently from each other hydrogen, C(0)-lower alkyl, cycloalkyl, -(CH ₂ )2-lower alkoxy, lower alkyl or oxetanyl;

or R 1 and R 2" ma form together with the N atom to which they are attached the group

R is hydrogen or lower alkyl;

and wherein the amine group NR 1 R 2 may be in other positions,

as well as a pharmaceutically acceptable salt thereof, a racemic mixture, or its

corresponding enantiomer and/or optical isomer and/or stereoisomer thereof, for example compound

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(2-morpholinopyrim idin-4-yl)indolin-2-one.

One embodiment of the invention are compounds of formula ID

wherein

R 1/R 2 are independently from each other hydrogen, C(Q)-lower alkyl, cycloalkyl, -(CH ₂ ) ₂ -lower alkoxy, lower alkyl or oxetanyl;

or R 1 and R 2" ma form together with the N atom to which they are attached the group

R is hydrogen or lower alkyl;

and wherein the amine group NR 1 R 2 may be in other positions,

as well as a pharmaceutically acceptable salt thereof, a racemic mixture, or its

corresponding enantiomer and/or optical isomer and/or stereoisomer thereof, for example compounds

l-(5-aminopyridin-3-yl)-3,3-dimethyl-6-(2-methylpyrimidin -5-yl)indolin-2-one or

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(5-morpholinopy ridin-3-yl)indolin-2-one.

One embodiment of the invention are compounds of formula IE

wherein

R 1/R 2 are independently from each other hydrogen, C(0)-lower alkyl, cycloalkyl, -(CH ₂ )2-lower alkoxy, lower alkyl or oxetanyl;

or R 1 and R 2" may form together with the N atom to which they are attached the group

R is hydrogen or lower alkyl;

and wherein the amine group NR 1 R2 and R 3 may be in other positions,

as well as a pharmaceutically acceptable salt thereof, a racemic mixture, or its

corresponding enantiomer and/or optical isomer and/or stereoisomer thereof, for example the compounds

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(6-morpholinopyrid in-2-yl)indolin-2-one

3-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l -yl)pyridin-2-yl)oxazolidin-2-one l-(6-amino-5-methylpyridin-2-yl)-3,3-dimethyl-6-(2-methylpyr imidin-5-yl)indolin-2-one

N-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindoli n-l-yl)-3-methylpyridin-2- yl)acetamide

3,3-dimethyl-l-(5-methyl-6-morpholinopyridin-2-yl)-6-(2-meth ylpyrimidin-5-yl)indolin-2-one or

3-(6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l -yl)-3-methylpyridin-2- yl)oxazolidin-2-one.

One embodiment of the invention are compounds of formula IF

wherein

the amine group -NR 1 R2 , for R 2 being hydrogen, may form together with two neighboring carbon atoms from the group A as described in formula I an additional fused ring, selected from

R is hydrogen;

as well as with a pharmaceutically acceptable salt thereof, with a racemic mixture, or with its corresponding enantiomer and/or optical isomer and/or stereoisomer thereof, for example the compounds

l-(lH-indol-4-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5-yl) indolin-2-one

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(lH-pyrrolo[2,3 -c]pyridin-4-yl)indolin-2-one 5-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl )-l-methyl-lH-imidazo[4,5- b]pyrazin-2(3H)-one

5- (3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)- lH-imidazo[4,5-b]pyrazin- 2(3H)-one

6- (3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)- 3,3-dimethyl-lH-pyrrolo[2,3- b]pyridin-2(3H)-one

7- (3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)- lH-pyrido[2,3-b][l,4]oxazin- 2(3H)-one

6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl )-l,3,3-trimethyl-lH-pyrrolo[2,3- b]pyridin-2(3H)-one l-cyclopropyl-6-(3,3-dimethyl-6-(2-methylpyrimidm^

pyrrolo[3,2-c]pyridin-2(3H)-one

,3,3,3',3'-pentamethyl-6-(2-methylpyrimidin-5-yl)-[l,6'-biin doline]-2,2'-dione

-(4-methoxybenzyl)-3,3,3 3'-tetramethyl-6-(2-methylpyrimidin-5-yl)-[l,6'-biindoline]- 2,2'- dione

6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl )-3,3-dimethyl-lH-pyrrolo[3,2- c]pyridin-2(3H)-one

3,3,3', 3'-tetramethyl-6-(2-methylpyrimidin-5-yl)-[l,6'-biindoline]- 2,2'-dione

3,3-dimethyl-l-(2-methyloxazolo[4,5-b]pyridin-5-yl)-6-(2-met hylpyrimidin-5-yl)indolin-2-one

7'-fluoro- ,3,3,3 3'-pentamethyl-6-(2-methylpyrimidin-5-yl)-[l,6'-biindoline]- 2,2'-dione

6- (3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)- 4-methyl-2H- benzo [b] [ 1 ,4] oxazin-3 (4H)-one

3 ,3 -dimethyl- 1 -( 1 -methyl- 1 H-benzo[d] [ 1 ,2 _^

one

7- cyclopropyl-3-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxo indolin-l-yl)-5,5-dimethyl-5H- pyrrolo[2,3-c]pyridazin-6(7H)-one

5-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl )-l,3,3-trimethyl-lH-pyrrolo[2,3- b]pyridin-2(3H)-one

3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-l-(lH-pyrrolo[2,3-b] pyridin-6-yl)indolin-2-one 3,3,3', 3'-tetramethyl-6-(2-methylpyrimidin-5-yl)- -(oxetan-3-yl)-[l,6'-biindoline]-2,2'-dione 3,3-dimethyl-l-(l-methyl-lH-indazol-6-yl)-6-(2-methylpyrimid in-5-yl)indolin-2-one l-(l,3-dimethyl-lH-pyrazolo[3,4-b]pyridin-6-yl)-3,3-dimethyl -6-(2-methylpyrimidin-5- yl)indolin-2-one or

3, 3 -dimethyl- 1-(1 -methyl- lH-indol-6-yl)-6-(2-methylpyrimidin-5-yl)indolin-2-one.

The present compounds of formula I and their pharmaceutically acceptable salts can be prepared by methods known in the art, for example, by processes described below, which processes comprise

a) reacting a compound of formula

with a compound of formula

Y-A(R ³ )-NR ¹ R ² 2

to a compound of formula

wherein Y is CI, Br or I and the other groups have the meaning as described above and, if desired, converting the compounds obtained into pharmaceutically acceptable acid addition salts or

b) reacting a compound of formula 4

with HNR ^X R ²

to a compound of formula I

wherein X is CI, Br or I and the other groups have the meaning as described above and, if desired, converting the compounds obtained into pharmaceutically acceptable acid addition salts. The preparation of compounds of formula I of the present invention may be carried out in sequential or convergent synthetic routes. Syntheses of the compounds of the invention are shown in the following schemes. The skills required for carrying out the reaction and purification of the resulting products are known to those skilled in the art. The substituents and indices used in the following description of the processes have the significance given herein before unless indicated to the contrary.

In more detail, the compounds of formula I can be manufactured by the methods given below, by the methods given in the examples or by analogous methods. Appropriate reaction conditions for the individual reaction steps are known to a person skilled in the art. The reaction sequence is not limited to the one displayed in the schemes, however, depending on the starting materials and their respective reactivity the sequence of reaction steps can be freely altered. Starting materials are either commercially available or can be prepared by methods analogous to the methods given below, by methods described in the examples, or by methods known in the art.

Scheme 1

Compounds of formula I with A = substituted pyrazines, pyrimidines, pyridazines, pyridines, and fused rings can be prepared by coupling compounds 1 ( WO2014/202493 Al) with aryl- halogenides 2 (Y = CI, Br, I) in the presence of copper(I)iodide, a ligand such as Ν,Ν'- dimethylethylendiamine and a base, e.g. potassium carbonate. Scheme 2

base, HN R ¹ R ²

Compounds of formula 4 can be synthesized with compounds 1 (WO2014/202493 Al) and aryl- halogenides 3 (Y = CI, Br, I) in the presence of copper(I)iodide, a ligand such as Ν,Ν'- dimethylethylendiamine and a base, e.g. potassium carbonate. Final compounds I can be prepared from compounds 4 (X= CI, F) by aromatic substitution in a presence of a base, preferentially triethylamine or potassium carbonate.

Experimental Part

The following examples are provided for illustration of the invention. They should not be considered as limiting the scope of the invention, but merely as being representative thereof.

Abbreviations:

Boc, t-butyloxycarbonyl;

DIPEA, diisopropylethylamine;

DMAP, dimethylaminopyridine;

DMF, dimethylformamide;

DMSO, dimethylsulfoxide;

EDCI, 1 -ethyl-3-(3-dimethylaminopropyl)carbodiirnid;

EtOAc, ethyl acetate;

HOBt, 1-hydroxybenzotriazole; MeOH, methanol;

NMP, N-methyl-2-pyrrolidon;

PMB, p-methoxybenzyl;

TFA, trifluoroacetic acid;

THF, tetrahydrofuran.

General: Silica gel chromatography was either performed using cartridges packed with silica gel (ISOLUTE® Columns, TELOSTM Flash Columns) or silica-NH2 gel (TELOSTM Flash NH ₂ Columns) on ISCO Combi Flash Companion or on glass columns on silica gel 60 (32-60 mesh, 60 A). MS: Mass spectra (MS) were measured with ion spray positive or negative method on a

Perkin-Elmer SCIEX API 300.

Example 1

3 -Diinethyl-6-(2-methylpyriinidin-5-yl)-l-(6-morpholinopyrazi n-2-yl)indolin-2-one

In a pressure tube, argon was bubbled through a suspension of 3,3-dimethyl-6-(2- methyl pyri m idin-5-y 1 )i ndol i n-2-onc (80 mg, 3 16 μ ηιοΐ. Eq: 1, W02( ) 14/2( 12493 Al), 4-(6- bromopyrazin-2-yl)morpholine (116 mg, 474 μπιοΐ, Eq: 1.5) and potassium carbonate (87.3 mg, 632 μπιοΐ, Eq: 2) in acetonitrile (1.26 ml) for 5 minutes. Copper (I) iodide (6.02 mg, 31.6 μπιοΐ, Eq: 0.1) and N,N'-dimethylethylenediamine (5.57 mg, 6.8 μΐ, 63.2 μπιοΐ, Eq: 0.2) were added, again flushed with argon, and the tube was sealed and the reaction mixture was heated to 120 °C overnight. The crude material was diluted with dichloromethane and concentrated in vacuo. The residue was purified by chromatography on silica gel to afford the desired product as a white solid (115 mg, 87 ). MS (m/z) = 417.2 [M + H]+.

Example 2

l-(6-Aimnopyrazin-2-yl)-3 -diinethyl-6-(2-methylpyri

In a pressure tube, argon was bubbled through a suspension of 3,3-dimethyl-6-(2- methyl pyri m idin-5-y 1 )i ndol i n-2-onc (80 mg, 316 μη οΐ, Eq: 1 , W( )2 ⁽ 1 1 4/202493 Al ), 6- bromopyrazin-2-amine (82.4 mg, 474 μπιοΐ, Eq: 1.5) and potassium carbonate (87.3 mg, 632 μπιοΐ, Eq: 2) in acetonitrile (1.26 ml) for 5 minutes. Copper (I) iodide (12 mg, 63.2 μπιοΐ, Eq: 0.2) and N,N'-dimethylethylenediamine (1 1.1 mg, 13.6 μΐ, 126 μπιοΐ, Eq: 0.4) were added, again flushed with argon, the tube was sealed and the reaction mixture was heated to 120 °C overnight. The crude material was diluted with dichloromethane and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a white solid (80 mg, 73 %). MS (m/z) = 347.2 [(M+H) ⁺ ].

Example 3

3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-l-(6-(2-ox

one

Example 3 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (from WO2014/202493 Al) with 1 -( 6-bromopyra/i n-2-y 1 )py rrol idi n-2-onc in analogy to example 2 to give the title compound (97 %) as a light yellow solid.

MS (m/z) = 415.2 [(M+H) ⁺ ].

Example 4

3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-l-(6-(pyrrolidin-l-yl) pyrazin-2-yl)indolin-2-one

Example 4 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (from WO2014/202493 Al) with 2-bromo-6-( pyrrol id in- 1 -yl )pyra/ine in analogy to example 2 to give the title compound (92 %) as a light red solid. MS (m/z) = 401.2 [(M+H) ⁺ ].

Example 5

N-(6-(3 -Dimethyl-6-(2-methylpyrimidin-5-yl)-^

l-(6-Aminopyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrirnidi n-5-yl)indolin-2-one (55 mg, 159 μπιοΐ, Eq: 1, Example 2) and acetic anhydride (32.4 mg, 30 μΐ, 318 μπιοΐ, Eq: 2) were combined with acetic acid (529 μΐ). The reaction mixture was heated to 80 °C and stirred for 2h. The reaction mixture was poured into 50 mL of saturated sodium bicarbonate and extracted with dichloromethane (2 x 50 mL). The organic layers were combined and washed with saturated sodium bicarbonate and brine, dried over sodium sulfate then filtered and evaporated in vacuo. The residue was purified by chromatography on silica gel to afford the desired product as a white solid (53 mg, 85 %). MS (m/z) = 389.1 [M + H]+

Example 6

l-(6-(4,4-Difluoropiperidin-l-yl)pyrazin-2-yl)-3,3-diinethyl -6-(2-methylpyrimidin-5- yl)indolin-2-one

a)l-(6-Chloropyrazin-2-yl)-3 -dimethyl-6-(2-methylpy

Example 6a was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (from WO2014/202493 Al) with 2-bromo-6-chloropyrazine in analogy to example 1 to give the title compound (58 %) as a light yellow solid. MS (m/z) = 366.2 [(M+H) ⁺ ]. b) l-(6-(4,4-Difluoropiperidin-l-yl)pyrazin-2-yl)-3 -dim

l)indolin-2-one

l-(6-Chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidi n-5-yl)indolin-2-one (50 mg, 137 μπιοΐ, Eq: 1), triethylamine (27.7 mg, 38.1 μΐ, 273 μπιοΐ, Eq: 2) and 4,4-difluoropiperidine hydrochloride (25.8 mg, 164 μπιοΐ, Eq: 1.2) were combined with tetrahydrofuran (342 μΐ). The reaction mixture was heated to 100-150 °C for 3 days with regular addition of the amine and the base until no starting material was left. The crude material was concentrated in vacuo.

The residue was purified by chromatography on silica gel, followed by preparative HPLC to afford the desired product as a white solid (29 mg, 47 ). MS (m/z) = 451.2 [M + H]+.

Example 7

l-(6-(Cyclopropylamino)pyrazin-2-yl)-3 -diinethyl-6-(2-methylpyrimidin-5-yl)indolin-2- one

l-(6-Chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidi n-5-yl)indolin-2-one (50 mg, 137 μπιοΐ, Eq: 1, Example 6a) and cyclopropylamine (546 mg, 674 μΐ, 9.57 mmol, Eq: 70) were combined. The reaction mixture was heated to 100 °C and stirred for 5h.

The residue was purified by chromatography on silica gel, followed by trituration with diisopropylether to afford the desired product as a light yellow solid (30 mg, 56 %).

MS (m/z) = 387.2 [M + H]+.

Example 8

l-[6-(2-Methoxyethylamino)pyrazin-2-yl]-3 -dimethyl-6-(2-methylpyrimidin-5-yl)indol-2- one

l-(6-Chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidi n-5-yl)indolin-2-one (50 mg, 137 μπιοΐ, Eq: 1, Example 6a) and 2-methoxyethanamine (616 mg, 716 μΐ, 8.2 mmol, Eq: 60) were heated for 24h at 100 °C.

The residue was purified by chromatography on silica gel to afford the desired product as a white foam (52 mg, 94 ). MS (m/z) = 405.2 [M + H]+.

Example 9

l-(6-(4-Hydroxypiperidin-l-yl)pyrazin-2-yl)-3,3-dimethyl-6-( 2-methylpyrimidin-5- yl)indolin-2-one

Example 9 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with piperidin-4-ol in analogy to example 6b to give the title compound (88 %) as a white solid. MS (m/z) = 431.2 [(M+H) ⁺ ].

Example 10

l-(6-(1 -Di xidothiomorpholino)pyrazin-2-yl)-3 -dimethyl-6-(2-methylpyriinidin-5- l)indolin-2-one

Example 10 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with thiomorpholine 1,1 -dioxide in analogy to example 6b to give the title compound (77 %) as a white solid. MS (m/z) = 465.2 [(M+H) ⁺ ].

Example 11

l-(6-(4-Hydroxy-4-methylpiperidin-l-yl)pyrazin-2-yl)-3,3-dim ethyl-6-(2-methylpyrimidin-

5-yl)indolin-2-one

l-(6-Chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidi n-5-yl)indolin-2-one (52 mg, 142 μπιοΐ, Eq: 1, Example 6a), 4-methylpiperidin-4-ol (24.6 mg, 213 μπιοΐ, Eq: 1.5) and potassium carbonate (39.3 mg, 284 μπιοΐ, Eq: 2) were combined with acetonitrile (711 μΐ). The reaction mixture was heated to 100 °C and stirred for 3 days until no starting material was left.

The residue was purified by chromatography on silica gel to afford the desired product as a light yellow foam (63 mg, 99 %). MS (m/z) = 445.2 [M + H]+. Example 12

l-(6-((2-Methoxyethyl)(methyl)amino)pyrazin-2-yl)-3 -dimethyl-6-(2-methylpyrimidin l)indolin-2-one

Example 12 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrirnidin- 5- yl)indolin-2-one (Example 6a) with 2-methoxy-N-metliylethanamine in analogy to example 1 1 to give the title compound (95 %) as a light yellow solid. MS (m/z) = 419.2 [(M+H) ⁺ ].

Example 13

l-(6-((lR,5S)-3-Oxa-6-azabicyclo[3.1.1]heptan-6-yl)pyrazin-2 -yl)-3,3-dimethyl-6-(2- meth lpyrimidin-5-yl)indolin-2-one

Example 13 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with (lR,5S)-3-oxa-6-azabicyclo[3.1.1]heptane 2,2,2- trifluoroacetate in analogy to example 11 to give the title compound (91 %) as a light yellow solid. MS (m/z) = 429.2 [(M+H) ⁺ ].

Example 14

l-(6-(6-Oxa-l-azaspiro[3.3]heptan-l-yl)pyrazin-2-yl)-3,3- dimethyl-6-(2-methylpyrimidin-5- yl)indolin-2-one

Example 14 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with 6-oxa-l-azaspiro[3.3]heptan-l-ium oxalate in analogy to example 11 to give the title compound (17 %) as a white solid. MS (m/z) = 429.3 [(M+H) ⁺ ].

Example 15

3-(6-(3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)pyra zin-2-yl)oxazolid^ one

In a pressure tube, argon was bubbled through a suspension of l-(6-chloropyrazin-2-yl)-3,3- dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (50 mg, 137 μπιοΐ, Eq: 1, Example 6a), oxazolidin-2-one (17.9 mg, 205 μπιοΐ, Eq: 1.5) and potassium carbonate (37.8 mg, 273 μπιοΐ, Eq: 2) in acetonitrile (911 μΐ) for 5 minutes. Copper (I) iodide (10.4 mg, 54.7 μπιοΐ, Eq: 0.4) and N,N'-dimethylethylenediamine (9.64 mg, 11.8 μΐ, 109 μπιοΐ, Eq: 0.8) were added, again flushed with argon, the tube was sealed and the reaction mixture was heated to 120 °C for 6.5h.

The residue was purified by chromatography on silica gel to afford the desired product as a light yellow solid (30 mg, 52 ). MS (m/z) = 417.2 [M + H]+.

Example 16

l-(6-((lR,5S)-6-Oxa-3-azabicyclo[3.1.1]heptan-3-yl)pyrazin-2 -yl)-3,3-dimethyl-6-(2- methylpyrimidin-5-yl)indolin-2-one

Example 16 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with (lR,5S)-6-oxa-3-azabicyclo[3.1.1]heptan-3-ium oxalate in analogy to example 11 to give the title compound (92 %) as a light yellow solid. MS (m/z) = 429.3 [(M+H) ⁺ ].

Example 17

3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-l-(6-(oxetan-3-ylainin o)pyrazin-2-yl)indolin-2- one

Example 17 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with oxetan-3-amine in analogy to example 8 to give the title compound (36 %) as a light yellow solid. MS (m/z) = 403.2 [(M+H) ⁺ ].

Example 18

3 -Diinethyl-l-(5-methyl-6-morpholinopyrazin-2-yl)-6-(2-methyl pyrimidin-5-yl)indolin-2- one

a) 4-(6-Chloro-3-methylpyrazin-2-yl)morpholine

3,5-Dichloro-2-methylpyrazine (100 mg, 613 μπιοΐ, Eq: 1), cesium fluoride (280 mg, 1.84 mmol, Eq: 3) and morpholine (53.4 mg, 52.9 μΐ, 613 μ ηιοΐ. Eq: 1) were combined with dimethyl sulfoxide (2.04 ml) and stirred at room temperature overnight. The reaction mixture was poured into 20 mL of water and extracted with ethyl acetate (2 x 25 mL). The organic layers were washed with water, dried over sodium sulfate then filtered and evaporated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a light yellow viscous oil (78 mg, 59 %). MS (m/z) = 214.1 [M + H]+. b) 3 -Dimethyl-l-(5-methyl-6-morpholinopyrazin-2-y^

one

In a pressure tube, argon was bubbled through a suspension of 3,3-dimethyl-6-(2- methyl pyri m idin-5-y 1 )i ndol i n-2-onc (80 mg, 316 μ ηιοΐ. Eq: 1, W02( ) 14/2( 12493 Al), 4-(6- chloro-3-methylpyrazin-2-yl)morpholine (74.2 mg, 347 μπιοΐ, Eq: 1.1) and cesium carbonate (134 mg, 411 μπιοΐ, Eq: 1.3) in dioxane (1.58 ml) for 5 minutes. Xantphos (36.5 mg, 63.2 μπιοΐ, Eq: 0.2) and tris(dibenzylideneacetone)dipalladium (0) (57.8 mg, 63.2 μπιοΐ, Eq: 0.2) were added, again flushed with argon, the tube was sealed and the reaction mixture was heated to 120 °C overnight.

The residue was purified by chromatography on silica gel to afford the desired product as a light red foam (90 mg, 66 %). MS (m/z) = 431.2 [M + H]+.

Example 19

l-(6-((2-Methoxyethyl)amino)-5-methylpyrazin-2-yl)-3 ^

yl)indolin-2-one

a) 6-Chloro-N-(2-methoxyethyl)-3-methylpyrazin-2-amine

Example 19a was prepared from 3,5-dichloro-2-methylpyrazine with 2-methoxyethanamine in analogy to example 18a to give the title compound (53 %) as a white solid. MS (m/z) = 202.1 [(M+H) ⁺ ]. b) l-(6-((2-Methoxyethyl)amino)-5-methylpyrazm^

l)indolin-2-one6-chloro-N-(2-methoxyethyl)-3-methylpyrazin-2 -amine

Example 19b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (WO2014/202493 Al) with 6-chloro-N-(2-methoxyethyl)-3-methylpyrazin-2-amine in analogy to example 18b to give the title compound (65 %) as a light yellow foam.

MS (m/z) = 417.4 [(M-H) ⁺ ].

Example 20

3-(6-(3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-3-m ethylpyrazin-2- l)oxazolidin-2-one

a) 3-(6-Chloro-3-methylpyrazin-2-yl)oxazolidin-2-one

Example 20a was prepared from 3,5-dichloro-2-methylpyrazine with oxazolidin-2-one in analogy to example 18a to give the title compound (77 %) as a colorless viscous oil.

MS (m/z) = 214.1 [(M+H) ⁺ ]. b) 3-(6-(3 -Dimethyl-6-(2-methylpyrirnidin-5-yl)-2-oxoindolin-l-yl)-3-m ethylpyrazin-2- yl)oxazolidin-2-one

Example 20b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (WO2014/202493 Al) with 3-(6-chloro-3-methylpyrazin-2-yl)oxazolidin-2-one in analogy to example 18b to give the title compound (79 %) as a light brown foam.

MS (m/z) = 431.3 [(M+H) ⁺ ].

Example 21

(R)-3-(6-(3 -Diinethyl-6-(2-methylpyriinidin-5-yl)-2-oxoindolin-l-yl)pyr azin-2-yl)-4- iso ropyloxazolidin-2-one

Example 21 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with (R)-(+)-4-isopropyloxazolidin-2-one in analogy to example 15 to give the title compound (24 %) as a light yellow amorphous solid.

MS (m/z) = 459.4 [(M+H) ⁺ ].

Example 22

(S)-3-(6-(3,3-Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindol in-l-yl)pyrazin-2-yl)-4- isopropyloxazolidin-2-one

Example 22 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with (S)-(-)-4-isopropyloxazolidin-2-one in analogy to example 15 to give the title compound (24 %) as a light yellow amorphous solid.

MS (m/z) = 459.4 [(M+H) ⁺ ].

Example 23

3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-l-(2-morph^

Example 23 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 4-(4-bromopyrimidin-2-yl)morpholine in analogy to example 2 to give the title compound (99 %) as a white foam. MS (m/z) = 417.2 [(M+H) ⁺ ].

Example 24

3 -Diinethyl-6-(2-methylpyrimidin-5- l)-l-(4-morpholinopyrimidin-2-yl)indolin-2-one

Example 24 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 4-(2-bromopyrimidin-4-yl)morpholine in analogy to example 2 to give the title compound (70 %) as a colorless solid. MS (m/z) = 417.2 [(M+H) ⁺ ].

Example 25

l-(5-Aminopyridin-3-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5- yl)indolin-2-one

Example 25 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 5-bromopyridin-3-amine in analogy to example 2 to give the title compound (100 %) as a light brown solid. MS (m/z) = 346.1 [(M+H) ⁺ ].

Example 26

3 -Diinethyl-6-(2-methylpyrimidin-5- l)-l-(5-morpholinopyridin-3-yl)indolin-2-one

Example 26 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 4-(5-bromopyridin-3-yl)morpholine in analogy to example 2 to give the title compound (46 %) as a white solid. MS (m/z) = 416.2 [(M+H) ⁺ ].

Example 27

3,3-Diinethyl-6-(2-methylpyrimidin-5-yl)-l-(6-morpholinopyri din-2-yl)indolin-2-one

Example 27 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 4-(6-bromopyridin-2-yl)morpholine in analogy to example 2 to give the title compound (72 %) as a white solid. MS (m/z) = 416.2 [(M+H) ⁺ ].

Example 28

3-(6-(3 -Diinethyl-6-(2-methylpyriinidin-5-yl)-2-oxoindolin-l-yl)pyr idin-2-yl)oxazolidin-2- one

a)l-(6-Chloropyridin-2-yl)-3 -dimethyl-6-(2-methylpyrimidin-5-yl)m^

Example 28a was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (WO2014/202493 Al) with 2-bromo-6-chloropyridine in analogy to example 2 to give the title compound (63 %) as a yellow solid. MS (m/z) = 365.2 [(M+H) ⁺ ]. b) 3-(6-(3 -Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)pyrid in-2-yl)oxazolidin- one

Example 28b was prepared from l-(6-chloropyridin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one with oxazolidin-2-one in analogy to example 15 to give the title compound (42 %) as a white solid. MS (m/z) = 416.3 [(M+H) ⁺ ].

Example 29

l-(6-Amino-5-methylpyridin-2-yl)-3 -dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-

Example 29 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 6-bromo-3-methylpyridin-2-amine in analogy to example 2 to give the title compound (89 %) as a light yellow solid. MS (m/z) = 360.2 [(M+H) ⁺ ].

Example 30

N-(6-(3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-3-m ethylpyridin-2- l)acetamide

l-(6-Amino-5-methylpyridin-2-yl)-3,3-dimethyl-6-(2-methyl pyrimidin-5-yl)indolin-2-one (72 mg, 200 μmol, Eq: 1, Example 29) was diluted with acetic acid (668 μΐ). Acetic anhydride (40.9 mg, 37.8 μΐ, 401 μπιοΐ, Eq: 2) was then added. The reaction mixture was stirred for 2h at 80 °C. The reaction mixture was poured into saturated sodium bicarbonate and extracted with dichloromethane (2x). The organic phases were combined and washed brine, dried over sodium sulfate then filtered and evaporated in vacuo to afford the desired product as a light yellow solid (82 mg, 100 %). MS (m/z) = 402.3 [(M+H) ⁺ ].

Example 31

3 -Diinethyl-l-(5-methyl-6-morpholinopyridin-2-yl)-6-(2-methyl pyrimidin-5-yl)indolin-2- one

a)l-(6-Fluoro-5-methylpyridin-2-yl)-3 -dimethyl-6-(2-methylpyrimidin-5-yl)indoH

Example 31a was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (WO2014/202493 Al) with 6-bromo-2-fluoro-3-methylpyridine in analogy to example 2 to give the title compound (75 %) as a white solid. MS (m/z) = 363.2 [(M+H) ⁺ ]. b) 3 -Dimethyl-l-(5-methyl-6-morpholinopyridin-2-yl)-6-(2-methylp yrimidin-5-yl)indolin-2- one

l-(6-Fluoro-5-methylpyridin-2-yl)-3,3-dimethyl-6-(2-methy lpyrimidin-5-yl)indolin-2-one (53.8 mg, 148 μmol, Eq: 1) and morpholine (776 mg, 779 μΐ, 8.91 mmol, Eq: 60) were heated for 2 days at 110 °C.

The residue was purified by chromatography on silica gel to afford the desired product as a light yellow foam (55 mg, 86 %). MS (m/z) = 430.3 [M + H]+.

Example 32

3-(6-(3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-3-m ethylpyridi

yl)oxazolidin-2-one

l-(6-Fluoro-5-methylpyridin-2-yl)-3,3-dimethyl-6-(2-methy lpyrimidin-5-yl)indolin-2-one (40 mg, 110 μπιοΐ, Eq: 1, Example 31a) was dissolved in dimethylsulfoxide (368 μΐ). Cesium fluoride (50.3 mg, 331 μηιοΐ, Eq: 3) and oxazolidin-2-one (12.5 mg, 143 μηιοΐ, Eq: 1.3) were added . The reaction mixture was stirred for 24h at 100 °C. The reaction mixture was poured into water and extracted with ethyl acetate (2x). The organic phases were combined and washed brine, dried over sodium sulfate then filtered and evaporated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as an off- white solid (14 mg, 29 %). MS (m/z) = 430.3 [(M+H) ⁺ ].

Example 33

l-(lH-Indol-4-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5-yl)ind olin-2-one

Example 33 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 4-bromo-lH-indole in analogy to example 2 to give the title compound (44 %) as a white solid. MS (m/z) = 369.2 [(M+H) ⁺ ].

Example 34

3,3-Diinethyl-6-(2-methylpyrimidin-5-yl)-l-(lH-pyrrolo[2,3-c ]pyridin-4-yl)indolin-2-one

Example 34 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 4-bromo- i I l-pyrrolo| 2,3-c (pyridine in analogy to example 2 the title compound (17 %) as a white solid. MS (m/z) = 370.2 [(M+H) ⁺ ].

Example 35

5-(3,3-Diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-y l)-l-methyl-lH-imidazo[4,5- b]pyrazin-2(3H)-one

a) l-(6-Amino-5-(methylamino)pyrazin-2-yl)-3 -dim

one

Example 35a was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 5-bromo-N2-methylpyrazine-2,3-diamine in analogy to example 2 to give the title compound (52 %) as a brown solid. MS (m/z) = 376.2 [(M+H) ⁺ ]. b) 5-(3 -Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-l-me thyl-lH-imidazor4,5- blpyrazin-2(3H)-one

l-(6-Amino-5-(methylamino)pyrazin-2-yl)-3,3-dimethyl-6-(2 -methylpyrimidin-5-yl)indolin-2- one (60 mg, 160 μ ηιοΐ. Eq: 1) and 1 , -carbonyldiimidazole (64.8 mg, 400 μ ηιοΐ. Eq: 2.5 ) were combined with tetrahydrofuran (864 μΐ). The reaction mixture was heated to 50 °C and stirred overnight.

The residue was purified by chromatography on silica gel and finally triturated with ethyl acetate to afford the desired product as a light brown solid (19 mg, 29 ). MS (m/z) = 402.2 [M + H]+. Example 36

5-(3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-lH- iinidazo[4,5-b]pyrazin-

2(3H)-one

a)l-(5,6-Diaminopyrazin-2-yl)-3 -dimethyl-6-(2-meth^

Example 36a was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (WO2014/202493 Al) with 5-bromopyrazine-2,3-diamine in analogy to example 2 to give the title compound (94 %) as a light yellow solid. MS (m/z) = 362.1 [(M+H) ⁺ ]. b) 5-(3 -Dimethyl-6-(2-methylpyrimidin-5-yl)-^^

2(3H)-one

Example 36b was prepared from l-(5,6-diaminopyrazin-2-yl)-3,3-dimethyl-6-(2- methylpyrimidin-5-yl)indolin-2-one in analogy to example 35b to give the title compound (62 %) as a light yellow cristalline solid. MS (m/z) = 388.2 [(M+H) ⁺ ].

Example 37

6-(3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-3,3 -diinethyl-lH- pyrrolo[2,3-b]pyridin-2(3H)-one

a) 6-Chloro-l-(4-methoxybenzyl)-3 -dimethyl-lH-pyrrolor2 -blpyridin-2(3H)-one

6-Chloro-3,3-dimethyl-lH-pyrrolo[2,3-b]pyridin-2(3H)-one (300 mg, 1.53 mmol, Eq: 1, PCT Int. Appl., 2014040969) was dissolved in dimethylformamide (10.2 ml). Cesium carbonate (994 mg, 3.05 mmol, Eq: 2) and l-(chloromethyl)-4-methoxybenzene (263 mg, 229 μΐ, 1.68 mmol, Eq: 1.1) were added. The reaction mixture was stirred at 80 °C for 5h. The reaction mixture was poured into 50 mL of water and extracted with ethyl acetate (2x). The combined organic layers were washed with brine, dried over sodium sulfate then filtered and evaporated in vacuo to afford the desired product as a light yellow solid (473 mg, 97 ). MS (m/z) = 317.1 [M + H]+. b) 6-(3,3-Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl )-l-(4-methoxybenzyl)-3,3- dimethyl-lH-pyrrolor2,3-blpyridin-2(3H)-one

3,3-Dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (80 mg, 316 μπιοΐ, Eq: 1,

WO2014/202493 Al) was dissolved in dry and degassed dioxane (1.58 ml ) under argon atmosphere. Then 6-chloro-l-(4-methoxybenzyl)-3,3-dimethyl-lH-pyrrolo[2,3-b]p yridin-2(3H)- one (150 mg, 474 μπιοΐ, Eq: 1.5) and cesium carbonate (134 mg, 411 μπιοΐ, Eq: 1.3), followed by tris(dibenzylideneacetone)dipalladium (0) (57.8 mg, 63.2 μπιοΐ, Eq: 0.2) and xantphos (36.5 mg, 63.2 μπιοΐ, Eq: 0.2) were added and the tube was flushed with Argon. The reaction mixture was stirred for 24h at 120 °C.

The residue was purified by chromatography on silica gel to afford the desired product a light yellow solid (158 mg, 94 ). MS (m/z) = 534.3 [M + H]+. c) 6-(3 -Dimethyl-6-(2-methylpyrimidin-5-yiy^

bl ridin-2(3H)-one

6-(3 ,3-Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin- 1 -yl)- 1 -(4-methoxybenzyl)-3 ,3 - dimethyl-lH-pyrrolo[2,3-b]pyridin-2(3H)-one (158.9 mg, 298 μπιοΐ, Eq: 1) and trifluoroacetic acid (1.65 ml) were heated for few days at 110 °C until no starting material was left. The reaction mixture was evaporated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as an off- white solid (42 mg, 34 ). MS (m/z) = 414.3 [M + H]+.

Example 38

7-(3,3-Diinethyl-6-(2-methylpyriinidin-5-yl)-2-oxoindolin-l- yl)-lH-pyrido[2,3- b][l,4]oxazin-2(3H)-one

Example 38 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 7-bromo-lH-pyrido[2,3-b][l,4]oxazin-2(3H)-one in analogy to example 2 to give the title compound (88 %) as a brown solid. MS (m/z) = 402.2 [(M+H) ⁺ ]. Example 39

6-(3 -Diinethyl-6-(2-methylpyriinidin-5-yl)-2-oxoindolin-l-yl)-l, 3 _? 3-trimethyl-lH- pyrrolo[2,3-t>]pyridin-2(3H)-one

Example 39 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 6-chloro-l ,3,3-trimethyl-lH-pyrrolo[2,3-b]pyridin-2(3H)-one (PCT Int. AppL, 2014040969) in analogy to example 37b to give the title compound (64 %) as a brown solid. MS (m/z) = 428.3 [(M+H) ⁺ ].

Example 40

l-Cyclopropyl-6-(3,3-dimethyl-6-(2-methylpyrimidin-5-yl)- 2-oxoindolin-l-yl)-3,3-dimethyl- lH-pyrrolo[3,2-c]pyridin-2(3H)-one

Example 40 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 6-chloro-l-cyclopropyl-3,3-dimethyl-lH-pyrrolo[3,2-c]pyridin - 2(3H)-one (PCT Int. AppL, 2014040969) in analogy to example 37b to give the title compound (51%) as a white solid. MS (m/z) = 454.4 [(M+H) ⁺ ].

Example 41

l',3,3 _? 3' _? 3'-Pentamethyl-6-(2-methylpyrimidin-5-yl)-[l,6'-biindo line]-2,2'-dione

a) 6-bromo- 1 ,3 ,3 -trimethylindolin-2-one

Sodium hydride (4.53 g, 94.3 mmol, Eq: 4) and dry tetrahydrofuran (20 ml) were mixed under argon. A suspension of 6-bromoindolin-2-one (5 g, 23.6 mmol, Eq: 1.00) in dry tetrahydrofuran (50 ml) was added in portions. The mixture was stirred at room temperature for 20 min. Then iodomethane (13.4 g, 5.87 ml, 94.3 mmol, Eq: 4) was added dropwise at 23-26 °C. The light brown suspension was stirred at room temperature overnight. The reaction mixture was carefully quenched with 10 ml of saturated ammonium chloride. The mixture was diluted with 200 ml of ethyl acetate, 100 ml of water and 50 ml of saturated sodium bicarbonate. The mixture was extracted with 100 ml of ethyl acetate (2x) and the organic layers were washed with 50 ml of saturated sodium bicarbonate. The combined organic layers were dried with sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product a white solid (4.16g, 69 %). MS (m/z) = 254.4/256.4 [M + H]+. b) l 3 3'-Pentamethyl-6-(2-methylpyrimidin-5-yl)-ri,6'-biindolinel- 2,2'-dione

Example 41b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (WO2014/202493 Al) with 6-bromo-l,3,3-trimethylindolin-2-one in analogy to example 2 to give the title compound (100 %) as an off-white solid. MS (m/z) = 427.3 [(M+H) ⁺ ]. Example 42

l'-(4-Methox benz l)-3 3'-tetΓameth l-6-(2-meth l ΓiInidin-5- l)-[l,6'-biindoline]-

2,2'-dione

a) 6-Bromo-l-(4-methoxybenzyl)-3,3-dimethylindolin-2-one

6-Bromo-3,3-dimethylindolin-2-one (6.58 g, 27.4 mmol, Eq: 1.00, W02< 114/202493 Al), 1 - (chloromethyl)-4-methoxybenzene (4.72 g, 4.11 ml, 30.1 mmol, Eq: 1.1) and cesium carbonate (17.9 g, 54.8 mmol, Eq: 2) were combined with dimethylformamide (170 ml). The reaction mixture was heated to 80 °C and stirred for 20 h. The crude reaction mixture was concentrated in vacuo. The reaction mixture was poured into 200 mL of water and extracted with ethyl acetate (2 x 200 mL). The organic layers were washed with water, dried over sodium sulfate and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a light brown crystalline solid (9.18 g, 93 %). MS (m/z) = 362.4 [(M+H) ⁺ ]. b) r-(4-Methoxybenzyl)-3,3,3',3'-tetramethyl-6-(2-methylpyrimid in-5-yl)-ri,6'-biindolinel-2,2'- dione

Example 42b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al ) with 6-bromo- 1 -( 4-methoxyben/yl )-3.3-di methyl i ndol in-2-one in analogy to example 2 to give the title compound (97 %) as a light yellow foam.

MS (m/z) = 533.4 [(M+H) ⁺ ].

Example 43

6-(3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-3,3 -diinethyl-lH- pyrrolo[3,2-c] ridin-2(3H)-one

a) 6-Chloro-l-(methoxymethyl)-3,3-dimethyl- lH-pyrrolor3,2-clpyridin-2(3H)-one

6-Chloro-3,3-dimethyl-lH-pyrrolo[3,2-c]pyridin-2(3H)-one (70 mg, 356 μιηοΐ, Eq: 1 , PCT Int. Appl., 2012143726) and sodium hydride (17.1 mg, 427 μπιοΐ, Eq: 1.2) were combined with dimethylformamide (890 μΐ) and tetrahydrofuran (890 μΐ) at 10 °C. After 30min,

chloro(methoxy)methane (43 mg, 40.6 μΐ, 534 μmol, Eq: 1.5) was added and the reaction mixture was stirred at room temperature for 2h. The reaction mixture was poured into water and extracted with ethyl acetate. The organic layers were washed with water, dried over sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a light yellow solid (68 mg, 79 %). MS (m/z) = 241.1 [M + H]+. b) 6-(3 -Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-l-(m ethoxym dimeth l-lH-pyrrolor3,2-clpyridin-2(3H)-one

Example 43b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 6-chloro-l-(methoxymethyl)-3,3-dimethyl-lH-pyrrolo[3,2- c]pyridin-2(3H)-one in analogy to example 37b to give the title compound (94 %) as an orange foam. MS (m/z) = 458.3 [(M+H) ⁺ ]. c) 6-(3 -Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxom^

clpyridin-2(3H)-one

6-(3 ,3-Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin- 1 -yl)- 1 -(methoxymethyl)-3 ,3 - dimethyl-lH-pyrrolo[3,2-c]pyridin-2(3H)-one (111 mg, 243 μπιοΐ, Eq: 1) was combined with trifluoroacetic acid (2.43 ml). The reaction mixture was heated to 85 °C in a sealed tube and stirred for 1 day then to 120 °C and stirred for 1.5 days. The reaction mixture was diluted with water, then saturated sodium bicarbonate was added and it was extracted with dichloromethane. The organic layers were dried over sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a white solid (49 mg, 48%). MS (m/z) = 414.3 [(M+H) ⁺ ].

Example 44

3 3'-TetΓameth l-6-(2-meth l Γimidin-5- l)-[l,6'-biindoline]-2,2'-dione

A solution of -(4-methoxybenzyl)-3,3,3 3'-tetramethyl-6-(2-methylpyrimidin-5-yl)-[l,6'- biindoline]-2,2'-dione (0.21 g, 394 μη οΐ, Eq: 1, Example 42) in trifluoroacetic acid (1.78 g, 1.2 ml, 15.6 mmol, Eq: 39.5) was heated to 110 °C for lOh. The reaction mixture was diluted with dichloromethane and concentrated in vacuo. The reaction mixture was diluted with ethyl acetate, water and basified with 1M sodium carbonate. The mixture was extracted 2 times with ethyl acetate and the organic layers were washed with 1M sodium bicarbonate. The combined organic layers were dried with sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a light yellow solid (123 mg, 75 %). MS (m/z) = 413.3 [(M+H) ⁺ ].

Example 45

3 -Diinethyl-l-(2-methyloxazolo[4,5-b]pyridin-5- one

3,3-Dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (100 mg, 395 μπιοΐ, Eq: 1,

W02( 114/202493 Al), 5-bromo-2-methyloxazolo[4,5-b]pyridine (109 mg, 5 13 μ ηιοΐ. Eq: 1.30), copper (I) iodide (7.52 mg, 39.5 μπιοΐ, Eq: 0.10), potassium carbonate (109 mg, 790 μπιοΐ, Eq: 2.00) and (lR,2R)-Nl,N2-dimethylcyclohexane-l,2-diamine (11.6 mg, 12.8 μΐ, 79 μπιοΐ, Eq: 0.20) were combined with degassed dioxane (6 ml) and flushed with nitrogen. The reaction mixture was heated to 110 °C and stirred for 24h under nitrogen atmosphere. The reaction mixture was poured into saturated sodium bicarbonate and extracted with ethyl acetate (2x). The organic layers were combined and washed with water and brine. The organic phase was dried over sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a yellow solid (50 mg, 32 ). MS (m/z) = 386.3 [(M+H) ⁺ ].

Example 46

7'-FluoΓO-1^3 3'-pentameth l-6-(2-meth lp Γimidin-5- l)-[l,6'-biindoline]-2,2'-dione

a) 7-Fluoro-l,3,3-trimethylindolin-2-one

Sodium hydride (6.35 g, 159 mmol, Eq: 4) was suspended in tetrahydrofuran (72.3 ml) and 7- fluoroindolin-2-one (6 g, 39.7 mmol, Eq: 1.00) was added portionwise during 20 min. The reaction mixture was stirred at room temperature for 4h. The reaction was quenched with 20 ml of ammonium chloride at 5-15 °C and then was diluted with tert-butyl methyl ether and water. The mixture was extracted with tert-butyl methyl ether (2x) and washed with brine. The combined organic phases were dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by chromatography on silica gel to afford the desired product as a pink solid (7.48g, 97 ). MS (m/z) = 194.4 [M + H]+. b) 7-Fluoro-l,3,3-trimethyl-6-(trimethylsilyl)indolin-2-one

7-Fluoro-l,3,3-trimethylindolin-2-one (7.4 g, 38.3 mmol, Eq: 1.00) and trimethylsilyl chloride (4.58 g, 5.38 ml, 42.1 mmol, Eq: 1.1) were dissolved in dry tetrahydrofuran (57.4 ml). The mixture was cooled to -75 °C and a fresh solution of lithium diisopropylamide (prepared from diisopropylamine (4.5 g, 6.34 ml, 44.0 mmol, Eq: 1.15) and n-buthyl lithium (26.3 ml, 42.1 mmol, Eq: 1.1) in dry tetrahydrofuran (19.1 ml) at -40 °C) was added dropwise during 10 min (increase of temperature maximum to -68°C). The reaction mixture was stirred for 4h in an ice bath then at room temperature overnight. The reaction mixture was quenched with water and extracted with ethyl acetate (2x). The organic phase was washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as an orange solid (6.32 g, 62 ). MS (m/z) = 266.5 [M + H]+. c) 7-Fluoro-6-iodo-l,3,3-trimethylindolin-2-one

7-Fluoro-l,3,3-trimethyl-6-(trimethylsilyl)indolin-2-one (6.23 g, 23.5 mmol, Eq: 1.00) was dissolved in dry dichloromethane (354 ml). The reaction was cooled to 0°C and iodine monochloride, 1M in dichloromethane (23.5 ml, 23.5 mmol, Eq: 1.00) was added dropwise. The reaction mixture was stirred at room temperature overnight. Iodine monochloride, 1M in dichloromethane (11.7 ml, 11.7 mmol, Eq: 0.5) was added again and stirred for 45 min. The reaction mixture was quenched with sodium thiosulfate and it was stirred for 30 min. The mixture was extracted with dichloromethane and washed with water. The organic phase was dried over sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as an orange solid (6.84 g, 91 %). MS (m/z) = 320.3 [M + H]+. d) 7'-Fluoro-l\3 \3'-pentamethyl-6-(2-methylpyrimidin-5-yl)-ri,6'-biindolinel -2,2'-dione

Example 46d was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 7-!luoro-6-iodo- 1 -tri methyl indolin-2-one in analogy to example 2 to give the title compound (18 %) as a colorless amorphous solid. MS (m/z) = 445.3 [(M+H) ⁺ ].

Example 47

6-(3,3-Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl )-4-methyl-2H- benzo[b] [l,4]oxazin-3(4H)-one

Example 47 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 6-bromo-4-methyl-2H-benzo[b] [l,4]oxazin-3(4H)-one in analogy to example 45 to give the title compound (55 %) as an off-white solid. MS (m/z) = 415.3 [(M+H) ⁺ ].

Example 48

3,3-Dimethyl-l-(l-methyl-lH-benzo[d][l,2,3]triazol-6-yl)-6-( 2-methylpyrimidin-5- yl)indolin-2-one

Example 48 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 6-bromo- 1 -methyl- 1 ! !-ben/o|d]| 1 ,2.3 |tria/olc in analogy to example

2 to give the title compound (80 %) as an off-white solid. MS (m/z) = 385.3 [(M+H) ⁺ ].

Example 49

3 -Diinethyl-6-(2-methylpyrimidin-5- l)-l-(5-morpholinopyrazin-2-yl)indolin-2-one

Example 49 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 4-(5-bromopyrazin-2-yl)morpholine in analogy to example 2 to give the title compound (81 %) as a white solid. MS (m/z) = 417.2 [(M+H) ⁺ ].

Example 50

3 -Diinethyl-l-(5-(2-methyl-lH-imidazol-l-yl)pyrazin-2-yl)-6-( 2-methylpyrimidin-5- yl)indolin-2-one

Example 50 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 2-bromo-5-(2-methyl- 1 11-imida ol- 1 -yl )pyra/.ine in analogy to example 2 to give the title compound (91 %) as a light yellow solid.

MS (m/z) = 412.2 [(M+H) ⁺ ].

Example 51

l-(5-((lR,5S)-3-Oxa-6-azabicyclo[3.1.1]heptan-6-yl)pyrazin-2 -yl)-3,3-dimethyl-6-(2- methylpyrimidin-5-yl)indolin-2-one

a) (lR,5S)-6-(5-Bromopyrazin-2-yl)-3-oxa-6-azabicyclor3.1.11hep tane

2,5-Dibromopyrazine (70 mg, 288 μπιοΐ, Eq: 1) was dissolved in dimethylsulfoxide (961 μΐ). Cesium Fluoride (131 mg, 865 μπιοΐ, Eq: 3) and 3-oxa-6-azabicyclo[3.1.1]heptane 2,2,2- trifluoroacetate (61.5 mg, 288 μπιοΐ, Eq: 1) were added. The reaction mixture was stirred at 70 °C for 48h. The reaction mixture was diluted with water and extracted with ethyl acetate (2x). The combined organic phases were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as an off- white solid (41 mg, 56 %). MS (m/z) = 256.1 [M + H]+. b) l-(5-((lR,5S)-3-Oxa-6-azabicvclor3.1.11heptan-6-yl)pyrazin-2 -yl)-3,3-dimethyl-6-(2- methylpyrimidin-5-yl)indolin-2-one

Example 51b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with (lR,5S)-6-(5-bromopyrazin-2-yl)-3-oxa-6-azabicyclo[3.1.1]hep tane in analogy to example 2 to give the title compound (86 %) as an off-white solid. MS (m/z) = 429.2 [(M+H) ⁺ ].

Example 52

l-(5-((2-Hydroxyethyl)amino)pyrazin-2-yl)-3 -diinethyl-6-(2-methylpyrimidin-5- yl)indolin-2-one

a) 2-((5 -Bromopyrazin-2-yl)amino)ethanol

Example 52a was prepared from 2,5-dibromopyrazine with 2-aminoethanol in analogy to example 51a to give the title compound (60 %) as an off-white solid.

MS (m/z) = 220.0 [(M+H) ⁺ ]. b) l-(5-((2-Hydroxyethyl)amino)pyrazin-2-yl)-3 -dimethyl-6-(2-methylpyrimidin-5-yl)indoli 2-one

Example 52b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 2-((5-bromopyrazin-2-yl)amino)ethanol in analogy to example 2 to give the title compound (82 %) as a white foam. MS (m/z) = 391.3 [(M+H) ⁺ ]. Example 53

7-Cyclopropyl-3-(3 -diinethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l-yl)-5,5 -dimethyl-

5H-pyrrolo[2,3-c]pyridazin-6(7H)-one

a 3 ,6-Dichloro-N-cyclopropylpyridazin-4-amine

3,4,6-Trichloropyridazine (10 g, 53.4 mmol, Eq: 1.00) and cyclopropanamine (31.1 g, 38.2 ml, 534 mmol, Eq: 10) were combined with tetrahydrofuran (100 ml). The reaction mixture was heated to 50 °C and stirred for 3h. The reaction mixture was diluted with ethyl acetate and water. The mixture was extracted 2 times with ethyl acetate and the organic layers washed with brine. The combined organic layers were dried with sodium sulfate, filtered and concentrated in vacuo. The residue was purified by chromatography on silica gel to afford the desired product as a light yellow crystalline solid (9.75 g, 89 %). MS (m/z) = 204/206 [M + H]+. b) 5,8-Dichloro-l-cyclopropyl-7-isobutyryl-3,3-dimethyl-l,6,7-t riazaspiror3.51nona-5,8-dien-2- one

3,6-Dichloro-N-cyclopropylpyridazin-4-amine (8.68 g, 42.5 mmol, Eq: 1.00), triethylamine (7.75 g, 10.7 ml, 76.6 mmol, Eq: 1.8) and isobutyryl chloride (6.94 g, 6.82 ml, 63.8 mmol, Eq: 1.5) were combined with dichloromethane (130 ml) and stirred for 20h at room temperature. The reaction mixture was diluted with methylene chloride and water and extracted 2 times with methylene chloride. The combined organic layers were dried with sodium sulfate, filtered and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a yellow solid (13.75 g, 93 %). MS (m/z) = 344.09 [M + H]+. c) 3-Chloro-7-cyclopropyl-5,5-dimethyl-5H-pyrrolor2,3-clpyridaz in-6(7H)-one

5,8-Dichloro-l-cyclopropyl-7-isobutyryl-3,3-dimethyl-l,6,7-t riazaspiro[3.5]nona-5,8-dien-2-one (10.4g, 30.3 mmol, Eq:l) and sodium tert-butoxide (5.82 g, 60.6 mmol, Eq: 2) were combined with dioxane (250 ml). The flask was evacuated and flushed with argon 3 times. Then di-1- adamantylphosphine oxide (214 mg, 606 μπιοΐ, Eq: 0.02) and palladium (II) acetate (136 mg, 606 μπιοΐ, Eq: 0.02) were added and stirred at 80 °C overnight. The crude reaction mixture was concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a light yellow crystalline solid (2 g, 27 ). MS (m/z) = 238.2 [M + H]+. d) 7-Cyclopropyl-3-(3 -dimethyl-6-(2-methylpyri

5H-pyrrolor2,3-clpyridazin-6(7H)-one

Example 53d was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 3-chloro-7-cyclopropyl-5,5-dimethyl-5H-pyrrolo[2,3-c]pyridaz in- 6(7H)-one in analogy to example 37b to give the title compound (46 %) as a white solid.

MS (m/z) = 455.3 [(M+H) ⁺ ]. Example 54

5-(3 -Diinethyl-6-(2-methylpyriinidin-5-yl)-2-oxoindolin-l-yl)-l, 3 _? 3-trimethyl-lH- pyrrolo[2,3-b]pyridin-2(3H)-one

a) 5-Bromo- 1.3.3-trimethvl- 1 1 l-pvrrolo|2.3-b|pvridin-2(3l I l-one

5-Bromo-lH-pyrrolo[2,3-b]pyridin-2(3H)-one (500 mg, 2.35 mmol, Eq: 1) was combined with dimethylformamide (4 ml). Sodium hydride (113 mg, 2.82 mmol, Eq: 1.20) and iodomethane (500 mg, 223 μΐ, 3.52 mmol, Eq: 1.50) were added and it was stirred at room temperature for 2h. The reaction mixture was poured into water and extracted with ethyl acetate (2x). The organic layers were combined and washed with brine, dried over sodium sulfate and concentrated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as a yellow solid (150 mg, 25 %). MS (m/z) = 255.1 [M + H]+. b) 5 -(3 ,3 -Dimethyl-6-(2-methylp yrimidin-5- yl)-2-oxoindolin- 1 - yl)- 1 ,3 ,3 -trimethyl- 1 H- pyrrolor2,3-blpyridin-2(3H)-one

Example 54b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 5-bromo-l,3,3-trimethyl-lH-pyrrolo[2,3-b]pyridin-2(3H)-one in analogy to example 45 to give the title compound (83 %) as a light yellow solid.

MS (m/z) = 428.4 [(M+H) ⁺ ].

Example 55

rac-(lS,5R)-4-(6-(3 -Diinethyl-6-(2-methylpyriinidin-5-yl)-2-oxoindolin-l-yl)pyr azin-2-yl)-

2-oxa-4-azabicyclo[3.2.0]heptan-3-one

l-(6-Chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidi n-5-yl)indolin-2-one (0.08 g, 219 μmol, Eq: 1, Example 6a), rac-(lS,5R)-2-oxa-4-azabicyclo[3.2.0]heptan-3-one (32.2 mg, 284 μπιοΐ, Eq: 1.3) and potassium carbonate (60.4 mg, 437 μπιοΐ, Eq: 2) were mixed in acetonitrile (1.09 ml) in a pressure tube and argon was bubbled through the reaction mixture for 5 minutes. Then N,N'-dimethylethylenediamine (7.71 mg, 9.42 μΐ, 87.5 μπιοΐ, Eq: 0.4) and copper(I) iodide (8.33 mg, 43.7 μπιοΐ, Eq: 0.2) were added, it was flushed again for 2 minutes with argon, the tube was sealed and the reaction heated to 120 °C for 24h.

The residue was purified by chromatography on silica gel to afford the desired product as a white solid (19 mg, 19 %). MS (m/z) = 443.4 [M + H]+.

Example 56

3-(6-(3,3-Dimethyl-6-(2-methylpyrimidin-5-yl)-2-oxoindolin-l -yl)pyrazin-2-yl)-5,5- dimethyloxazolidin-2-one

Example 56 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with 5,5-dimethyloxazolidin-2-one in analogy to example 55 to give the title compound (43 %) as a white solid. MS (m/z) = 445.3 [(M+H) ⁺ ].

Example 57

l-(6-(1 -Dioxidoisothiazolidin-2-yl)pyrazin-2-yl)-3 -diinethyl-6-(2-methylpyrimW

yl)indolin-2-one

Example 57 was prepared from l-(6-chloropyrazin-2-yl)-3,3-dimethyl-6-(2-methylpyrimidin-5 - yl)indolin-2-one (Example 6a) with isothiazolidine 1,1 -dioxide in analogy to example 55 to give the title compound (50 %) as a light yellow solid. MS (m/z) = 451.3 [(M+H) ⁺ ].

Example 58

3 -Diinethyl-6-(2-methylpyrimidin-5-yl)-l-(lH-pyrrolo[2,3-b]py ridin-6-yl)indolin-2-one

Example 58 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 6-chloro-lH-pyrrolo[2,3-b]pyridine in analogy to example 18b to give the title compound (9 %) as an amorphous yellow solid. MS (m/z) = 370.2 [(M+H) ⁺ ].

Example 59

3,3 _? 3' _? 3'-Tetramethyl-6-(2-methylpyrimidin-5-yl)-l'-(oxetan-3 -yl)-[l,6'-biindoline]-2,2'- dione

Example 59 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (from WO2014/202493 Al) with 6-bromo-3,3-dimethyl-l-(oxetan-3-yl)indolin-2-one (from

WO2014/202493 A I ) in analogy to example 2 to give the title compound (100 %) as a white solid. MS (m/z) = 469.3 [(M+H) ⁺ ].

Example 60

3 -Diinethyl-l-(l-methyl-lH-indazol-6-yl)-6-(2-methylpyriinidi n-5-yl)indolin-2-one

Example 60 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (from WO2014/202493 Al) with 6-bromo-l -methyl- lH-indazole in analogy to example 2 to give the title compound (99 %) as a white solid. MS (m/z) = 384.3 [(M+H) ⁺ ].

Example 61

l-(1 -Diinethyl-lH-pyrazolo[3,4-b]pyridin-6-yl)-3 -diinethyl-6-(2-methylpyrimidin-5- yl)indolin-2-one

a) 6-( 'hloro- 1 .3-dimethyl- 1 1 l-pyra/olo|3.4-h|pyi idinc

To a solution of l-(2,6-dichloropyridin-3-yl)ethanone (2.21 g, 11.6 mmol, Eq: 1.00) in ethanol (90 ml) was added methylhydrazine (643 mg, 735 μΐ, 14.0 mmol, Eq: 1.20) and N,N- diisopropylethylamine (1.5 g, 2.03 ml, 11.6 mmol, Eq: 1.00) and the reaction was heated to reflux for 2.5h. The solution was concentrated, dissolved in dichloromethane and washed with water. The organic layer was dried over sodium sulfate and evaporated in vacuo.

The residue was purified by chromatography on silica gel to afford the desired product as yellow cristals (1.57 g, 74 ). MS (m/z) = 182.1 [M + H]+. b) l-(1 -Dimethyl-lH-pyrazolor3^-blpyridin-6-yl)-3 -dimethyl-6-(2-methylpyrimi yl)indolin-2-one

Example 61b was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one

(WO2014/202493 Al) with 6-chloro-l,3-dimethyl-lH-pyrazolo[3,4-b]pyridine in analogy to example 18b to give the title compound (81 %) as a brown solid. MS (m/z) = 399.3 [(M-H) ⁺ ].

Example 62

3 -Diinethyl-l-(l-methyl-lH-indol-6-yl)-6-(2-methylpyrimidin-5 -yl)indolin-2-one

Example 62 was prepared from 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)indolin-2-one (from WO2014/202493 Al) with 6-bromo-l -methyl- IH-indole in analogy to example 2 to give the title compound (86 %) as a light brown solid. MS (m/z) = 383.3 [(M+H) ⁺ ].

Biological Assays and Data

Now it has been found that the compounds of formula I may be used for the treatment of CNS diseases.

The described compounds of formula I reduce L-687,414-induced hyperlocomotion. This was assessed by using a computerized Digiscan 16 Animal Activity Monitoring System (Omnitech Electronics, Columbus, Ohio) to quantify locomotor activity. Animals were kept under a 12 h light/dark cycle and experiments were performed during the light period. Each activity monitoring chamber consisted of a Plexiglas box (41x41x28 cm; WxLxH) with sawdust bedding on the floor surrounded by invisible horizontal and vertical infrared sensor beams. The test boxes were divided by a Plexiglas cross providing each mouse with 20x20 cm of moving space. Cages were connected to a Digiscan Analyzer linked to a computer that constantly collected the beam status information. Records of photocell beam interruptions for individual animals were taken every 5 min over the duration of the experimental session and the sum of the first 6 periods was used as the final parameter. At least 8 mice were used in each treatment group. Compounds were administered i.p. 15 min before a s.c. injection of 50 mg/kg of L-687,414. Mice were then transferred from their home cage to the recording chambers for a 15 -min habituation phase allowing free exploration of the new environment. Horizontal activity was then recorded for a 30-min time period. The % inhibition of L-687,414-induced hyperlocomotion was calculated according to the equation:

((Veh+L-687,414 horizontal activity - drug+L-687,414 horizontal activity)/Veh+L- 687,414 horizontal activity) x 100

ID ₅₀ values, defined as doses of each compound producing 50% inhibition of L-687,414- induced hyperlocomotion, were calculated by linear regression analysis of a dose-response data using an Excel-based computer-fitting program.

As data was not presupposed to be normally distributed, groups treated with test compounds were statistically compared with the control (vehicle-treated) group using one-tailed Mann Whitney U tests. In statistics, the Mann- Whitney U test (also called the Mann-Whitney- Wilcoxon (MWW) or Wilcox on rank-sum test) is a non-parametric statistical hypothesis test for assessing whether one of two samples of independent observations tends to have larger values than the other. It is one of the most well-known non-parametric significance tests. A p value gives the probability that two groups are significantly different from each other and the value of < 0.05 is generally accepted as a criterion, it implies that there is > 95% chance that two groups are really different from each other. P values given in table 1 are one-tailed since only decreases in locomotion were expected and tested for (Mann, H. B., Whitney, D. R. (1947), "On a Test of Whether one of Two Random Variables is Stochastically Larger than the Other", Annals of Mathematical Statistics, 18 (1), 50-60).

Determination of adenosine transport activity

To measure adenosine transport activity of ENT-1 mammalian cells, stable cells expressing the mouse ENT-1 transporter were plated on day 1 in 96-well culture plates at the density of 60,000 cells/well, in complete DMEM/F12 medium supplemented with glutamax, 10% FBS and 10 μg/ml puromycin. On day 2, the medium was aspirated and the cells were washed twice with uptake buffer (10 mM Hepes-Tris, pH 7.4 containing 150 mM NaCl, 1 mM

CaCb, 2.5 mM KCl, 2.5 mM MgS04, 10 mM D-glucose) (UB). For inhibition experiments, cells were then incubated at RT with various concentrations of compounds with 1 % DMSO final. Non-specific uptake was defined in the presence of 10 μΜ S-(4-Nitrobenzyl)-6-thioinosine (NBTI, Sigma Cat #N2255).

A solution containing [2,8- H]-adenosine 6 nM (40 Ci/mmol, American Radiolabeled chemicals Inc, Cat #ART 0287A) was then immediately added to the wells. The plates were then incubated for 20 min with gentle shaking and the reaction was stopped by aspiration of the mixture and washing (three times) with ice-cold UB. The cells were lysed by the addition of scintillation liquid, shaken 3 hours and the radioactivity in the cells was estimated using a microplates scintillation counter (TopCount NXT, Packard). Table 1

Effects of compounds of formula I on ENTl inhibition

Expl. structure ENTl, adenosine uptake,

IC50 (uM)

1 0.0390

2 0.1626

3 0.0570

4

A J 0.2526

10 0.0296

o

11 0.0338

12 0.0545

13 0.1374

14 0.1103

Table 2

Effects of compounds on L-687 ,414-induced hyperlocomotion

Expl.

L-687,414-induced hyperlocomotion

Dose Inhibition, P value

i ip [%]

[mg/kg]

1 30 ip 90 0.00008

3 30 ip 87.8 0.00031

15 30 ip 87.1 0.00008

18 30 ip 88.8 0.00016 20 30 ip 89.7 0.00016

39 30 ip 99.5 0.00008

47 30 ip 93.8 0.00008

50 30 ip 96.3 0.00008

54 30 ip 93.5 0.00016

As mentioned above, some compounds have been tested in SmartCube , an analytical system developed by PsychoGenics Inc.

SmartCube was used to compare the behavioral signature of a test compound to a database of behavioral signatures obtained from a large set of clinically approved reference drugs, grouped per indications. In this way, the neuro-pharmacological effects of a test compound can be predicted by similarity to major classes of compounds, such as antipsychotics, anxiolytics and antidepressants. This approach is ideally suited to screen collections of existing drugs or drug candidates with previously unknown neuropharmacology, which could expedite the development of new and unexpected treatments for psychiatric disorders.

Some compounds of the present invention were injected i.p. at different doses 15 minutes before the test. At least 8 mice were used in each treatment group. Digital videos of the subjects were processed with computer vision algorithms to extract over 2000 dependent measures including frequency and duration of many different behavioral states. The results of the classifications are presented as bar charts for each compound and dose (mg/kg), the Y-axis indicates the relative probability that the test compound will show efficacy in the specific CNS indication.

Compounds of the present invention show similar signatures to those of atypical antipsychotics. An independent analysis was performed on the unclassified data to determine the similarity of the example compounds to active doses of known atypical antipsychotics. For this analysis, we use discrimination rate as the measure of separability between the two drugs, i.e. one drug's "distinguishability" from another. A rate equal to 50% (or 0.5) corresponds to zero distinguishability. Empirical data has shown that a threshold rate for reliable separation lies above 70% i.e., two drugs showing a discrimination rate of 70% or lower are considered similar, whereas a discrimination rate higher than 70% indicates that two drugs are dissimilar. The table below shows the similarity analysis of selected compounds of the present invention to several atypical antipsychotics. In most cases, the example compounds show a similarity to risperidone, clozapine and olanzapine with a discrimination rate of < 0.70.

Table 3:

Similarity analysis of compounds of formula I showing effects in SmartCube ^®

Therefore, it can be assumed that the present compounds have similar efficacies as known atypical antipsychotics.

The compounds of formula (I) and pharmaceutically acceptable salts thereof can be used as medicaments, e.g. in the form of pharmaceutical preparations. The pharmaceutical preparations can be administered orally, e.g. in the form of tablets, coated tablets, dragees, hard and soft gelatine capsules, solutions, emulsions or suspensions. However, the administration can also be effected rectally, e.g. in the form of suppositories, or parenterally, e.g. in the form of injection solutions.

The compounds of formula (I) and pharmaceutically acceptable salts thereof can be processed with pharmaceutically inert, inorganic or organic carriers for the production of pharmaceutical preparations. Lactose, corn starch or derivatives thereof, talc, stearic acid or its salts and the like can be used, for example, as such carriers for tablets, coated tablets, dragees and hard gelatine capsules. Suitable carriers for soft gelatine capsules are, for example, vegetable oils, waxes, fats, semi-solid and liquid polyols and the like; depending on the nature of the active substance no carriers are, however, usually required in the case of soft gelatine capsules. Suitable carriers for the production of solutions and syrups are, for example, water, polyols, sucrose, invert sugar, glucose and the like. Adjuvants, such as alcohols, polyols, glycerol, vegetable oils and the like, can be used for aqueous injection solutions of water-soluble salts of compounds of formula (I), but as a rule are not necessary. Suitable carriers for suppositories are, for example, natural or hardened oils, waxes, fats, semi-liquid or liquid polyols and the like.

In addition, the pharmaceutical preparations can contain preservatives, solubilizers, stabilizers, wetting agents, emulsifiers, sweeteners, colorants, flavorants, salts for varying the osmotic pressure, buffers, masking agents or antioxidants. They can also contain still other therapeutically valuable substances.

As mentioned earlier, medicaments containing a compound of formula (I) or

pharmaceutically acceptable salts thereof and a therapeutically inert excipient are also an object of the present invention, as is a process for the production of such medicaments which comprises bringing one or more compounds of formula I or pharmaceutically acceptable salts thereof and, if desired, one or more other therapeutically valuable substances into a galenical dosage form together with one or more therapeutically inert carriers. The active compounds may also be used in form of their prodrugs.

As further mentioned earlier, the use of the compounds of formula (I) for the preparation of medicaments useful in the prevention and/or the treatment of the above recited diseases is also an object of the present invention.

The dosage can vary within wide limits and will, of course, be fitted to the individual requirements in each particular case. In general, the effective dosage for oral or parenteral administration is between 0.01-20 mg/kg/day, with a dosage of 0.1-10 mg/kg/day being preferred for all of the indications described. The daily dosage for an adult person weighing 70 kg accordingly lies between 0.7-1400 mg per day, preferably between 7 and 700 mg per day. Preparation of pharmaceutical compositions comprising compounds of the invention:

Tablets of the following composition are manufactured in the usual manner:

Manufacturing Procedure

Mix ingredients 1, 2, 3 and 4 and granulate with purified water.

Dry the granules at 50°C.

Pass the granules through suitable milling equipment.

Add ingredient 5 and mix for three minutes; compress on a suitable press.

Capsules of the following composition are manufactured: ingredient 111 g capsule

5 25 100 500

Compound of formula I 5 25 100 500

Hydrous Lactose 159 123 148 -

Corn Starch 25 35 40 70

Talk 10 15 10 25

Magnesium Stearate 1 2 2 5

Total 200 200 300 600

Manufacturing Procedure

1. Mix ingredients 1, 2 and 3 in a suitable mixer for 30 minutes.

2. Add ingredients 4 and 5 and mix for 3 minutes.

3. Fill into a suitable capsule.

A compound of formula I lactose and corn starch are firstly mixed in a mixer and then in a comminuting machine. The mixture is returned to the mixer; the talc is added thereto and mixed thoroughly. The mixture is filled by machine into suitable capsules, e.g. hard gelatin capsules.

Injection solutions of the following composition are manufactured:

Manufacturing Procedure A compound of formula I is dissolved in a mixture of Polyethylene Glycol 400 and water for injection (part). The pH is adjusted to 5.0 by acetic acid. The volume is adjusted to 1.0 ml by addition of the residual amount of water. The solution is filtered, filled into vials using an appropriate overage and sterilized.