| abstract |
Compounds of the formula (I) and salts thereof: <IMAGE> (I) wherein: A is a bond, -CH2- or -CH=CH-; R2 is hydrogen and R1 is selected from C1-4 alkyl, hydroxyl, C1-4 alkoxy, C1-4 alkanoyloxy, hydrogen, halogen, nitro, cyano, and amino optionally substituted by one or two C1-4 alkyl groups or by C1-4 alkanoyl; R4 is C1-4 alkyl, hydroxy, C1-4 alkoxy, C1-4 alkanoyloxy or nitrato; R2N is 1-piperidyl, morpholino or 4-methyl-1-piperazyl, optionally substituted by one or two methyl groups in the 2-, 4- or 6- positions as apt, or 1-pyrrolidyl substituted by one or two methyl groups. m is 0 or 1; and n is 0 to 3 a process for their preparation and compositions containing them. |