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Center for Integrated Molecular Systems, Division of Molecular and Life Sciences,Pohang University of Science and Technology, San 31 Hyojadong, Pohang 790-784, KoreaReceived January 10, 2003Optically pure α-mono- and α,α-disubstituted β-amino acids were conveniently prepared in four steps and in27-40% overall yields from the correspondingly substituted racemic β-hydroxy acids that can be readilyobtained from diethyl malonate. In the synthesis, (S)-phenylethylamine has been used as a resolving agent andas a source of the amino group in the β-amino acids.Key Words : α-Monosubstituted β-amino acids, α,α-Disubstituted β-amino acids, β-Lactams, (S)-Phenyl-ethylamine Introductionβ-Amino acids and their cyclyzed derivatives such as β-lactams have received much attention in recent years owingto their interesting biological activities.

Convenient Synthesis of Optically Pure α-Mono and α,α-Disubstituted β-Amino Acids