N-(arylsulphonyl) amino acid derivatives

A compound of formula:

• in which
• R1 is naphthyl, or tetrahydronaphthyl, said rings being unsubstituted or substituted one or more times with R10
• R2 is a phenyl which is unsubstituted or substituted one or more times with R11, a phenyl(C1-C4)alkyl which is unsubstituted or substituted one or more times on the phenyl with R11, a naphthyl which is unsubstituted or substituted one or more times with R11, a cyclohexyl which is unsubstituted or substituted one or more times with R11;
• R3 is hydrogen or a hydroxyl;
• R9 is hydrogen, a (C1-C4)alkyl or a phenyl(C1-C4)alkyl which is unsubstituted or substituted on the phenyl one or more times with R11;
• R10 is a halogen, a (C1-C4)alkyl, a (C1-C4)alkoxy, a hydroxyl, an amino, a (C1-C4)alkylamino or a di(C1-C4)alkylamino;
• R11 is a halogen, a (C1-C4)alkyl, a trifluoromethyl, a phenyl, a hydroxyl, a (C1-C4)alkoxy or a benzyloxy;
• or R11 is in the ortho position to the phenyl representing R2 and forms with R3 a methylene group or an ethylene group;
• or R11 is in the ortho position to the phenyl representing R2 and forms with R9 a methylene group or an ethylene group,
• C* is an asymmetric carbon atom;
• as well as the salts thereof with inorganic or organic acids.