1-amino-phthalazine derivatives, the preparation and the therapeutic use thereof

1. A compound corresponding to general formula (I)

wherein:

A represents a C 1-4 -alkylene group optionally substituted with one or more groups R 9 , which may be identical or different;

B represents a C 1-4 -alkylene group optionally substituted with one or more groups R 10 , which may be identical or different;

R 9 and R 10 each represent, independently of each other, a hydrogen atom or a C 1-5 -alkyl group, or, alternatively, R 9 and R 10 together form a single bond or a C 1-4 -alkylene group;

L represents a single bond or a C 1-2 -alkylene, —CH═CH— or —C≡C— group; the C 1-2 -alkylene and —CH═CH— groups being optionally substituted with one or more C 1-2 -alkyl substituents; or, alternatively, L represents a cycloprop-1,2-diyl group;

R 1 represents an aryl or heteroaryl group; the aryl and heteroaryl groups being optionally substituted with one or more radicals Z, which may be identical or different;

R 2 and R 3 represent, independently of each other, a hydrogen atom or a C 1-3 -alkyl or C 1-3 -fluoroalkyl group,

or, alternatively, R 2 and R 3 form, together with the carbon atom that bears them, a cycloprop-1,1-diyl group;

R 4 represents a hydrogen atom or a C 1-5 -alkyl, C 1-3 -fluoroalkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl-C 1-3 -alkylene, C 1-3 -alkyl-O—C 1-3 -alkylene, HO—C 1-3 -alkylene or C 1-3 -alkyl-X—C 1-3 -alkylene group in which X represents S, SO or SO 2 ,

or, alternatively, R 4 represents an R a R b N—C 1-3 -alkylene, aryl, aryl-C 1-3 -alkylene, aryl-O—, aryl-O—C 1-3 -alkylene, aryl-C 1-3 -alkylene-O—C 1-3 -alkylene, heteroaryl or heteroaryl-C 1-3 -alkylene group; the aryl, aryl-C 1-3 -alkylene, aryl-O—, aryl-O—C 1-3 -alkylene, heteroaryl and heteroaryl-C 1-3 -alkylene groups being optionally substituted with one or more radicals Z, which may be identical or different;

R 5 represents a hydrogen or halogen atom or a C 1-5 -alkyl, C 1-3 -fluoroalkyl, C 1-5 -alkoxy, C 1-3 -fluoroalkoxy, HO—C 1-3 -alkylene, —CN or C 1-3 -alkyl-X— group in which X represents S, SO or SO 2 ,

or, alternatively, R 5 represents an R a R b N—, R a R b N—C 1-3 -alkylene, aryl, aryl-C 1-3 -alkylene, aryl-O— or heteroaryl group; the aryl, aryl-C 1-3 -alkylene, aryl-O— and heteroaryl groups being optionally substituted with one or more radicals Z, which may be identical or different;

R 6 represents a hydrogen or halogen atom or a C 1-5 -alkyl, C 1-3 -fluoroalkyl, C 1-5 -alkoxy, C 1-3 -fluoroalkoxy, —CN, R a R b N—, R a R b N—C 1-3 -alkylene, aryl or heteroaryl group; the aryl and heteroaryl groups being optionally substituted with one or more radicals Z, which may be identical or different;

R 7 represents a hydrogen or halogen atom or a C 1-5 -alkyl, C 1-3 -fluoroalkyl, C 1-5 -alkoxy, C 1-3 -fluoroalkoxy, HO—C 1-3 -alkylene, —CN or C 1-3 -alkyl-X— group in which X represents S, SO or SO 2 ; or, alternatively, R 7 represents an R a R b N—, R a R b N—C 1-3 -alkylene, R a R b NC(O)—, C 1-3 -alkyl-C(O)—, aryl, aryl-O— or heteroaryl group; the aryl, aryl-O— and heteroaryl groups being optionally substituted with one or more radicals Z, which may be identical or different;

R 8 represents a hydrogen or halogen atom or a C 1-5 -alkyl, C 1-5 -alkoxy or C 1-3 -fluoroalkoxy group;

Z represents a hydrogen or halogen atom or a C 1-5 -alkyl, C 1-3 -fluoroalkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl-C 1-3 -alkylene, phenyl, C 1-5 -alkoxy, C 1-3 -fluoroalkoxy, C 1-3 -alkyl-O—C 1-3 -alkylene, HO—C 1-3 -alkylene, NO 2 , —CN, C 1-3 -alkyl-X— or C 1-3 -alkyl-X—C 1-3 -alkylene group in which X represents S, SO or SO 2 ,

or, alternatively, Z represents an R a R b N—, R a R b N—C 1-3 -alkylene, R a R b NC(O)—, C 1-3 -alkyl-C(O)—, C 1-4 -alkyl-CO 2 — or C 3-6 -cycloalkyl-C(O)— group,

or, alternatively, Z represents an oxo radical,

or, alternatively, two adjacent radicals Z together form a C 1-3 -alkylenedioxy group; and

R a and R b each represent, independently of each other, a hydrogen atom or a C 1-3 -alkyl or C 1-3 -alkyl-C(O)— group; or, alternatively, R a and R b form, together with the nitrogen atom that bears them, a heterocycle optionally substituted with one or more C 1-3 -alkyl or oxo groups;

it being understood that when R 2 , R 3 , R 5 , R 6 , R 7 and R 8 all represent a hydrogen atom, A and B both represent an ethylenyl group (—CH 2 CH 2 —) and L is a single bond, and R 1 and R 4 cannot both represent an unsubstituted phenyl group; or an acid-addition salt thereof, or an enantiomer a diastereoisomer thereof, or a mixture thereof.

2. The compound of claim 1 , wherein:

A represents a C 1-4 -alkylene group optionally substituted with one or more groups R 9 , which may be identical or different;

B represents a C 1-4 -alkylene group optionally substituted with one or more groups R 10 , which may be identical or different;

R 9 and R 10 each represent a hydrogen atom, or, alternatively, R 9 and R 10 together form a C 1-4 -alkylene group;

L represents a single bond or —CH═CH—;

R 1 represents an aryl or a heteroaryl group; the aryl and heteroaryl groups being optionally substituted with one or more radicals Z, which may be identical or different;

R 2 and R 3 represent, independently of each other, a hydrogen atom or a C 1-3 -alkyl group;

R 4 represents a hydrogen atom or a C 1-5 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl-C 1-3 -alkylene, C 1-3 -alkyl-O—C 1-3 -alkylene, aryl, aryl-C 1-3 -alkylene, aryl-C 1-3 -alkylene-O—C 1-3 -alkylene, heteroaryl or heteroaryl-C 1-3 -alkylene group; the aryl, aryl-C 1-3 -alkylene, heteroaryl and heteroaryl-C 1-3 -alkylene groups being optionally substituted with one or more radicals Z, which may be identical or different;

R 5 represents a hydrogen atom or a C 1-5 -alkyl, C 1-5 -alkoxy or aryl group; the aryl group being optionally substituted with one or more radicals Z, which may be identical or different;

R 6 represents a hydrogen atom;

R 7 represents a halogen atom or a C 1-5 -alkyl or C 1-5 -alkoxy group or an aryl;

R 8 represents a hydrogen atom;

Z represents a hydrogen or halogen atom or a C 1-5 -alkyl, C 1-3 -fluoroalkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl-C 1-3 -alkylene, phenyl, C 1-5 -alkoxy, C 1-3 -fluoroalkoxy, C 1-3 -alkyl-O—C 1-3 -alkylene, HO—C 1-3 -alkylene, NO 2 , —CN, C 1-3 -alkyl-X— or C 1-3 -alkyl-X—C 1-3 -alkylene group in which X represents S, SO or SO 2 ,

or, alternatively, Z represents an R a R b N—, R a R b N—C 1-3 -alkylene, R a R b NC(O)—, C 1-3 -alkyl-C(O)— or C 3-6 -cycloalkyl-C(O)— group,

or, alternatively, Z represents an oxo radical,

or, alternatively, two adjacent radicals Z together form a C 1-3 -alkylenedioxy group;

R a and R b each represent, independently of each other, a hydrogen atom or a C 1-3 -alkyl or C 1-3 -alkyl-C(O)— group,

or, alternatively, R a and R b form, together with the nitrogen atom that bears them, a heterocycle optionally substituted with one or more C 1-3 -alkyl or oxo groups;

or an acid-addition salt thereof, or an enantiomer or a diastereoisomer thereof, or a mixture thereof.

3. The A compound of claim 1 , wherein:

A represents a C 1-4 -alkylene group optionally substituted with a group R 9 ;

B represents a C 1-4 -alkylene group optionally substituted with a group R 10 ;

R 9 and R 10 each represent a hydrogen atom or R 9 and R 10 together form a C 1-4 -alkylene group;

L represents a single bond or —CH═CH—;

R 1 represents an aryl optionally substituted with one or more radicals Z, which may be identical or different;

R 2 and R 3 represent, independently of each other, a hydrogen atom or a C 1-3 -alkyl group;

R 4 represents a hydrogen atom or a C 1-5 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl-C 1-3 -alkylene, C 1-3 -alkyl-O—C 1-3 -alkylene, aryl or heteroaryl group; the aryl and heteroaryl groups being optionally substituted with one or more radicals Z, which may be identical or different;

R 5 represents a hydrogen atom;

R 6 represents a hydrogen atom;

R 7 represents a halogen atom, a methyl or a methoxy;

R 8 represents a hydrogen atom;

Z represents a hydrogen atom, a halogen atom or a C 1-5 -alkyl, C 1-5 -alkoxy, C 1-3 -alkyl-O—C 1-3 -alkylene, phenyl, HO—C 1-3 -alkylene, —CN or C 1-3 -alkyl-X— group in which X represents a sulfur atom,

or, alternatively, Z represents an R a R b N—, R a R b N—C 1-3 -alkylene, R a R b NC(O)— or C 1-3 -alkyl-C(O)— group,

or, alternatively, Z represents an oxo radical,

or, alternatively, two adjacent radicals Z together form a C 1-3 -alkylenedioxy group; and

R a and R b each represent, independently of each other, a hydrogen atom or a C 1-3 -alkyl or C 1-3 -alkyl-C(O)— group;

or an acid-addition salt thereof or an enantiomer or a diastereoisomer thereof, or a mixture thereof.

4. The compound of claim 1 , selected from the group consisting of:

7-methoxy-4-(4-methoxyphenyl)-N-[8-(2-naphthylmethyl)-8-azabicyclo[3.2.1]oct-3-yl]phthalazin-1-amine;

7-methoxy-4-(4-methoxyphenyl)-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

7-methoxy-4-(3-methoxyphenyl)-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

7-methoxy-4-(2-methoxyphenyl)-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]-4-phenylphthalazin-1-amine;

4-(4-methoxyphenyl)-7-methyl-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

4-(3,4-dimethoxyphenyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

N-[1-(1,3-benzodioxol-5-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine dihydrochloride;

4-ethyl-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

4-benzyl-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

7-methoxy-4-(methoxymethyl)-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine hydrochloride;

N-[1-(1-benzofuran-5-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

N-[1-(3,4-dimethylbenzyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

7-methoxy-4-(4-methoxyphenyl)-N-{1-[(1-methyl-1H-indol-2-yl)methyl]piperidin-4-yl}phthalazin-1-amine;

4-cyclopropyl-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

N-[1-(3-fluoro-4-methoxybenzyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

N-[1-(2,3-dihydro-1,4-benzodioxin-6-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

4-(1,3-benzodioxol-5-yl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

4-(4-chlorophenyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]-4-[4-(trifluoromethyl)phenyl]phthalazin-1-amine;

N-[1-(1-benzothien-2-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

4-cyclopentyl-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

N-[1-(2,3-dihydro-1-benzofuran-5-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

N-[1-(2,3-dihydro-1H-inden-5-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

7-methoxy-4-(4-methoxyphenyl)-N-{1-[1-(2-naphthyl)ethyl]piperidin-4-yl}phthaiazin-1-amine dihydrochloride;

N-[1-(1,3-benzothiazol-6-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthaiazin-1-amine;

N-[1-(1-benzothien-5-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

N-[1-(1H-indol-3-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

7-methoxy-4-(4-methylphenyl)-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

4-butyl-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthaiazin-1-amine;

7-methoxy-4-(4-methoxyphenyl)-N-{1-[(2E)-3-phenylprop-2-en-1-yl]piperidin-4-yl}phthalazin-1-amine dihydrochloride;

7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthaiazin-1-amine;

4-(cyclopropylmethyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

N-[1-(3-fluoro-4-methylbenzyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthaiazin-1-amine;

7-methoxy-4-(4-methoxyphenyl)-N-[1-(4-methylbenzyl)piperidin-4-yl]phthaiazin-1-amine;

4-(4-fluorophenyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

N-[1-(1H-indol-5-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthaiazin-1-amine;

7-methoxy-4-[4-(methoxymethyl)phenyl]-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

7-methoxy-N-[1-(4-methoxy-3-methylbenzyl)piperidin-4-yl]-4-(4-methoxyphenyl)phthalazin-1-amine;

7-methoxy-4-methyl-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

4-(2,5-dimethoxyphenyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

7-methoxy-4-(4-methoxyphenyl)-N-[1-(quinolin-6-ylmethyl)piperidin-4-yl]phthalazin-1-amine;

7-methoxy-4-(4-methoxyphenyl)-N-{1-[(1-methyl-1H-indol-5-yl)methyl]piperidin-4-yl}phthalazin-1-amine;

4-(2,4-dimethoxyphenyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

4-(3,5-dimethoxyphenyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]-4-(2-phenylethyl)phthalazin-1-amine dihydrochloride;

4-{4-[(diethylamino)methyl]phenyl}-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine trihydrochloride;

7-fluoro-4-(4-fluorophenyl)-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine;

7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]-4-pyridin-3-ylphthalazin-1-amine trihydrochloride;

N-[1-(4-chlorobenzyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine dihydrochloride;

{4-[(4-{[7-methoxy-4-(4-methoxyphenyl)phthalazin-1-yl]amino}piperidin-1-yl)methyl]phenyl}methanol dihydrochloride;

N-{1-[4-(aminomethyl)benzyl]piperidin-4-yl}-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine trihydrochloride;

N-{4-[(4-{[7-methoxy-4-(4-methoxyphenyl)phthalazin-1-yl]amino}piperidin-1-yl)methyl]phenyl}acetamide dihydrochloride;

1-{4-[(4-{[7-methoxy-4-(4-methoxyphenyl)phthalazin-1-yl]amino}piperidin-1-yl)methyl]phenyl}ethanone dihydrochloride;

N-[1-(1-benzofuran-5-ylmethyl)piperidin-4-yl]-4-(2,5-dimethoxyphenyl)-7-methoxyphthalazin-1-amine dihydrochloride;

N-[1-(1,3-benzodioxol-5-ylmethyl)piperidin-4-yl]-4-(2,5-dimethoxyphenyl)-7-methoxyphthalazin-1-amine dihydrochloride;

6-[(4-{[7-methoxy-4-(4-methoxyphenyl)phthalazin-1-yl]amino}piperidin-1-yl)methyl]-2H-chromen-2-one dihydrochloride;

N-[1-(1H-indol-6-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

7-methoxy-N-[1-(4-methoxybenzyl)piperidin-4-yl]-4-(4-methoxyphenyl)phthalazin-1-amine dihydrochloride;

N-[1-(4-ethylbenzyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine dihydrochloride;

N-[1-(1,3-benzothlazol-6-ylmethyl)piperidin-4-yl]-4-(2,5-dimethoxyphenyl)-7-methoxyphthalazin-1-amine;

7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]-4-(phenoxymethyl)phthalazin-1-amine dihydrochloride;

N-[-(1H-benzimidazol-5-ylmethyl)piperidin-4-yl]-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine;

7-chloro-4-(4-methoxyphenyl)-N-[1-(2-naphthyknethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

4-(4-bromophenyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

N-[1-(1,3-benzodioxol-5-ylmethyl)piperidin-4-yl]-7-methoxy-4-(methoxymethyl)phthalazin-1-amine dihydrochloride;

4-[(benzyloxy)methyl]-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

7-methoxy-5-phenyl-N-[1-(2-naphthylmethyl)piperidin-4-yl]phthalazin-1-amine dihydrochloride;

4-(hydroxymethyl)-7-methoxy-N-[1-(2-naphthylmethyl)piperidin-4-yl]-4-(phenoxymethyl)phthalazin-1-amine;

(−)-7-methoxy-4-(4-methoxyphenyl)-N-{1-[1-(2-naphthyl)ethyl]piperidin-4-yl}phthalazin-1-amine;

(+)-7-methoxy-4-(4-methoxyphenyl)-N-{1-[1-(2-naphthyl)ethyl]piperidin-4-yl}phthalazin-1-amine; and

N-{1-[4-(dimethylaminomethyl)benzyl]piperidin-4-yl}-7-methoxy-4-(4-methoxyphenyl)phthalazin-1-amine trihydrochloride.

5. A process for preparing a compound of formula (I) according to claim 1 ,

wherein a compound of general formula (III)

in which R 4 , R 5 , R 6 , R 7 and R 8 are as defined in the general formula (I) according to claim 1 ,

is reacted with a compound of general formula (II)

in which R 1 , R 2 , R 3 , L, A and B are as defined in the general formula (I) according to claim 1 .

6. A pharmaceutical composition which comprises at least one compound of formula (I) according to claim 1 , or a pharmaceutically acceptable salt thereof in combination with at least one pharmaceutically acceptable excipient.