Pyridoindolone derivatives substituted in the 3-position by a phenyl, their preparation and their application in therapeutics

1. A compound corresponding to the formula (I):

in which:

R 1 represents a hydrogen atom, a (C 1 -C 4 )alkyl group or a (CH 2 ) n OH, (CH 2 ) n —O-tetrahydropyran-2-yl, (CH 2 ) n NR′ 6 R′ 7 , (CH 2 ) n CN, (CH 2 ) n CO 2 (C 1 -C 4 )alk or (CH 2 ) n CONR 6 R 7 group;

R 2 represents a hydrogen atom or a (C 1 -C 4 )alkyl group;

R 3 represents a phenyl monosubstituted by a hydroxyl, hydroxymethyl, carboxyl, (C 1 -C 4 )alkanoyl, azido, (C 1 -C 4 )-alkoxycarbonyl, hydroxyiminomethyl, (C 1 -C 4 )alkylsulphonyl, trifluoromethyl, thiol, (C 1 -C 4 )alkylthio, cyano, (CH 2 ) m NR′ 7 R 10 , CONR 6 R 8 or O(CH 2 ) n R 9 group; a phenyl substituted by 2 to 5 identical or different substituents chosen from trifluoromethyl, hydroxyl, hydroxymethyl, carboxyl, (C 1 -C 4 )alkanoyl, azido, (C 1 -C 4 )alkoxycarbonyl, hydroxyiminomethyl, thiol, (C 1 -C 4 )alkylthio, (C 1 -C 4 )alkylsulphonyl, phenyl, cyano, (CH 2 ) m NR′ 7 R 10 , CONR 6 R 8 or O(CH 2 ) n R 9 group; or R 3 represents a benzodioxolyl group which is unsubstituted or substituted on the phenyl by a halogen atom;

R 4 and R 5 are identical or different and each independently represent a hydrogen or halogen atom or a hydroxyl, (C 1 -C 4 )alkyl, trifluoromethyl, phenyl, cyano, (C 1 -C 4 )alkoxy, (C 1 -C 4 )alkoxycarbonyl, (C 1 -C 4 )alkylsulphonyl, O—(CH 2 ) n NR 6 R 7 or (CH 2 ) n NR 6 R 7 group;

R 6 represents hydrogen or a (C 1 -C 4 )alkyl group;

R 7 represents hydrogen or a (C 1 -C 4 )alkyl group;

or R 6 and R 7 , together with the nitrogen atom to which they are bonded, form a heterocyclic radical chosen from: piperidyl, morpholinyl, pyrrolidinyl, piperazinyl or 4-methylpiperazin-1-yl;

R′ 6 represents hydrogen or a (C 1 -C 4 )alkyl group;

R′ 7 represents hydrogen or a (C 1 -C 4 )alkyl group;

or R′ 6 and R′ 7 , together with the nitrogen atom to which they are bonded, form a heterocyclic radical chosen from morpholinyl or pyrrolidinyl;

R 8 represents hydrogen, a (C 1 -C 4 )alkyl group or a —(CH 2 ) n NR 6 R 7 group;

or R 6 and R 8 , together with the nitrogen atom to which they are bonded, form a heterocyclic radical chosen from: piperidyl, morpholinyl, pyrrolidinyl, piperazinyl or 4-methylpiperazin-1-yl;

R 9 represents a phenyl radical or an amino, morpholin-4-yl, cyano or (C 1 -C 4 )alkoxycarbonyl group;

R 10 represents R′ 6 or a phenyl, pyridyl, pyrimidinyl or a (CH 2 ) n NR′ 6 R′ 7 group;

or R′ 7 and R 10 , together with the nitrogen atom to which they are bonded, form a heterocyclic radical chosen from piperazinyl or 4-methylpiperazin-1-yl;

n represents 1, 2 or 3;

m represents 0 or 1;

Alk represents an alkyl;

or an acid addition salt thereof.

2. A compound of formula (I) according to claim 1 , wherein:

R 1 represents a hydrogen atom or a methyl, cyanomethyl, (C 1 -C 4 )alkoxycarbonylmethyl, aminomethyl, aminoethyl, aminopropyl or pyrrolidinoethyl group;

and/or R 2 represents a methyl group;

and/or R 3 represents a phenyl monosubstituted by a hydroxyl, (C 1 -C 4 )alkoxycarbonyl, methylsulphonyl, trifluoromethyl, methylthio, cyanomethoxy, aminoethoxy, acetyl, hydroxymethyl, cyano, amino, azido, aminomethyl, hydroxyiminomethyl, or a (CH 2 ) m NR′ 7 R 10 group in which R′ 7 represents a hydrogen atom or a methyl, R 10 represents a hydrogen atom or a phenyl, pyridyl or pyrimidinyl group or R′ 7 and R 10 , together with the nitrogen atom to which they are bonded, form a piperazin-1-yl or 4-methylpiperazin-1-yl group, and m represents zero or one; or R 3 represents a phenyl substituted by 2 to 3 identical or different substituents chosen from a methylthio, trifluoromethyl, hydroxyl, (C 1 -C 4 )alkoxycarbonyl, methylsulphonyl, cyanomethoxy, aminoethoxy, acetyl, hydroxymethyl, cyano, amino, aminomethyl, hydroxyiminomethyl, or a (CH 2 ) m NR′ 7 R 10 group in which R′ 7 represents a hydrogen atom or a methyl, R 10 represents a hydrogen atom or a phenyl, pyridyl or pyrimidinyl group or R′ 7 and R 10 , together with the nitrogen atom to which they are bonded, form a piperazin-1-yl or 4-methylpiperazin-1-yl group, and m represents zero or one; or R 3 represents a benzodioxolyl group which is unsubstituted or substituted on the phenyl by a halogen atom;

and/or R 4 represents a halogen atom or a methyl, methoxy or (C 1 -C 4 )alkoxycarbonyl group;

and/or R 5 represents a hydrogen atom or a methyl group;

or an acid addition salt thereof.

3. A compound chosen from:

3-(2,4-dimethoxyphenyl)-1,9-dimethyl-2-oxo-2,9-dihydro-1H-pyrido[2,3-b]indole-6-carboxylic acid;

3-(2,4-dimethoxyphenyl)-1,6-dimethyl-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

3-(3-hydroxymethylphenyl)-1,6-dimethyl-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

3-(2,4-dichlorophenyl)-1,6-dimethyl-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

3-(1,6-dimethyl-2-oxo-2,9-dihydro-1H-pyrido[2,3-b]-indol-3-yl)benzonitrile;

3-(4-aminophenyl)-1,6-dimethyl-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

3-(6-chloro-1,3-benzodioxol-5-yl)-1,6-dimethyl-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

1,6-dimethyl-1,9-dihydro-3-(phenylaminophenyl)-2H-pyrido[2,3-b]indol-2-one;

6-bromo-3-(3,5-dimethylphenyl)-1-methyl-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

1,6-dimethyl-3-(3-(trifluoromethyl)phenyl)-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

1,6-dimethyl-3-(3-(pyridin-2-ylamino)phenyl)-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

1,6-dimethyl-3-(3-(pyrimidin-2-ylamino)phenyl)-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

3-(3-acetylphenyl)-1,6-dimethyl-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one;

methyl 9-(cyanomethyl)-3-(2,4-dichlorophenyl)-2-oxo-2,9-dihydro-1H-pyrido[2,3-b]indole-6-carboxylate;

or an acid addition salt thereof.

4. A pharmaceutical composition comprising a compound of formula (I) according to claim 1 , or a pharmaceutically acceptable salt thereof, and at least one pharmaceutically acceptable excipient.

5. A pharmaceutical composition comprising a compound of formula (I) according to claim 2 , or a pharmaceutically acceptable salt thereof, and at least one pharmaceutically acceptable excipient.

6. A pharmaceutical composition comprising a compound of formula (I) according to claim 3 , or a pharmaceutically acceptable salt thereof, and at least one pharmaceutically acceptable excipient.

7. The compound according to claim 3 , which is 3-(2,4-dimethoxyphenyl)-1,9-dimethyl-2-oxo-2,9-dihydro-1H-pyrido[2,3-b]indole-6-carboxylic acid or an acid addition salt thereof.

8. The compound according to claim 3 , which is 3-(2,4-dichlorophenyl)-1,6-dimethyl-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one or an acid addition salt thereof.

9. The compound according to claim 3 , which is 1,6-dimethyl-3-(3-(pyridin-2-ylamino)phenyl)-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one or an acid addition salt thereof.

10. The compound according to claim 3 , which is 1,6-dimethyl-3-(3-(pyrimidin-2-ylamino)phenyl)-1,9-dihydro-2H-pyrido[2,3-b]indol-2-one or an acid addition salt thereof.