Patent ID: 6348600
Filing Date: 2002-02-19
Classification: C07D

Abstract:
A method for making an optically active compound represented by the following formula (3) comprising cyclizing an optically active compound represented by the following formula (1) or (2), or an acid salt thereof: wherein R1 is a lower alkyl group having 1 to 4 carbon atoms, an aryl group, or an aralkyl group; each of R2 and R3 is a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, an acyl group, an alkoxylcarbonyl group, an alkylsulfonyl group, an arylsulfonyl group, or an aralkylsulfonyl group, R2 and R3 being the same or different; R4 is an alkyl group having 1 to 3 carbon atoms; and the carbon atom with the asterisk * is an asymmetric center by dissolving said compound represented by formula (1) or (2) or an acid salt thereof in a solvent.