| abstract |
The compounds of formula I: <IMAGE> I wherein R1 and R2 are, independently, hydrogen, alkyl, phenyl or benzyl; or R1 and R2, taken together, are benzylidene optionally substituted with R3 as defined below or alkylidene, or R1 and R2, taken together with the carbon to which they are attached, form a carbonyl moiety or a cycloalkyl group; R3 is hydrogen, hydroxy, halo, trifluoromethyl, trifluoromethoxy, alkyl, alkoxy, aralkoxy, alkanoyloxy, amino, mono- or di-alkylamino, alkanamido or alkanesulfonamido; R4 is hydrogen or alkyl; m is an integer 0, 1 or 2; n is an integer from 0 to 6, inclusive; Z is hydrogen, hydroxy, alkyl, alkenyl, alkynyl, alkoxy, cycloalkyl, polycyclo-alkyl, phenyl optionally substituted with R3 as defined above, phenoxy optionally substituted with R3 as defined above, naphthyl optionally substituted with R3 as defined above or naphthyloxy optionally substituted with R3 as defined above, heteroaryl or heteroaryloxy, in which the heterocyclic ring of the heteroaryl or heteroaryloxy group is selected from thiophene, furan, pyridine, pyrazine, pyrimidine, indole, indazole, imidazole, chroman, coumarin, carbostyril, quinoline, benzisoxazole, benzoxazole, pyrazole, pyrrole, thiazole, oxazole, or isoxazole and the heterocyclic ring is optionally substituted by R3 as defined above; or a pharmaceutically acceptable salt thereof, are useful in treating disorders of the dopaminergic system. |