PROCESS FOR PRODUCING NEW NH-SUBSTITUTED 4-(3,4-METHYLENE DIOXY-PHENYL)-PIPERIDINES

摘要

This invention provides new compounds of formula I, wherein R1 and R2 are the same or different and are in each case hydrogen, halogen, lower alkyl, hydroxy or lower alkoxy R3 is hydrogen or lower acyl and A stands for groups of formula R6 ¦ -C-(CH2)n- or -C=CH-CH2- ¦ ¦ R5(1) R5(2) wherein R5 and R6 are independently, hydrogen or methyl and n is 0, 1 or 2, useful as analgesic agents.