[(1S)-1-(4-methoxyphenyl)ethyl]amine hydrochloride as a chiral auxiliary. Addition of 2-chlorobenzaldehyde to a solution of sodium cyanide and [(1S)-1-(4-methoxyphenyl)ethyl]amine hydrochloride gave diastereoisomerically pure (2S)-(2-chlorophenyl)[(1S)-1-(4-methoxyphenyl)ethyl]amino}acetonitrile hydrochloride. Cleavage of the chiral auxiliary and concomitant hydrolysis of the nitrile group then