Patent ID: 7419961

Claim:
A compound of formula in which R is a hydrogen atom or a methyl R 1 is a hydrogen atom, an N,N-di-(C 1 -C 3 )-alkylamino group, an N,N-di-(C 1 -C 3 )-alkylamino-N-oxide group, an N—(C 1 -C 4 )-acyl-N—(C 1 -C 3 )-alkylamino group or together with R 2 forms a bond between the carbon atoms at 3′ and 4′; R 2 is a hydrogen atom or together with R 1 forms a bond between the carbon atoms at 3′ and 4′; R 3 is a linear or branched C 1 -C 5 alkyl, a benzyl optionally substituted with one or two substituents selected from nitro, hydroxy, carboxy, amino, linear or branched C 1 -C 5 alkyl, C 1 -C 4 alkoxy groups, C 1 -C 4 alkoxycarbonyl groups, aminocarbonyl groups or cyano or a chain of formula —(CH 2 )r-X—(CH 2 )m-Y—(CH 2 )n-A in which A is a hydrogen atom, a phenyl or a heteroaryl with five or six members containing from one to three atoms selected from nitrogen, oxygen and sulfur; X represents O, S, SO, SO 2 , NR 6 and R 6 is a hydrogen atom, a linear or branched C 1 -C 3 alkyl, a C 1 -C 3 alkoxycarbonyl group, a benzyloxycarbonyl group; Y is a C 6 H 4 group, a heteroaryl with five or six members containing from one to three atoms selected from nitrogen, oxygen and sulfur or represents O, S, SO, SO 2 , NR 6 where R 6 has the meanings given above; r is an integer of from 1 to 3; m is an integer of from 1 to 6; n is an integer of from 0 to 2; moreover the nitrogen atom to which R 3 is bound can be present in the N-oxide form; and their pharmaceutically acceptable salts; provided that when R is a hydrogen atom and R 1 is a dimethylamino group, R 3 is different from a (C 1 -C 5 )-alkyl group.