Stereoselective alkylation of utyl-1-t-butyloxycarbonyl-3-methyl-4-imi
dazolinone with 2-chloromethylquinoline, 2-chloromethylquinoxaline and
5-chloromethyl-1,10-phenanthroline, followed by hydrolysis, afforded
the corresponding (S)-(+)-alpha-amino acids with high enantiomeric exc
ess.