Patent ID: 6962998

Claim:
A method for producing racemic piperidine derivatives, which comprises processing an optically-active piperidine derivative of any of general formulae (1), (2) and (3): wherein R 1 represents a lower alkyl group having from 1 to 4 carbon atoms, a phenyl group, or an aralkyl group; R 2 , R 3 and R 4 may be the same or different, each representing a hydrogen atom, an alkyl group, a phenyl group, an aralkyl group, an alkoxycarbonyl group, an alkylsulfonyl group, an allylsulfonyl group, an aralkylsulfonyl group, or an acyl group; R 5 represents an alkyl group, a phenyl group, an aralkyl group, an alkoxycarbonyl group, an alkylsulfonyl group, an allylsulfonyl group, an aralkylsulfonyl group, or an acyl group, in a hydrogen atmosphere in the presence of a reducing catalyst.