Yn. Belokon' et al., A practical asymmetric synthesis of alpha-methyl alpha-amino acids using achiral Cu-salen complex as a phase transfer catalyst, TETRAHEDR L, 41(37), 2000, pp. 7245-7248
The asymmetric C-alkylation of N-benzylidene alanine methyl ester has been
achieved using a copper(II) (salen) complex as an asymmetric phase transfer
catalyst and provides a practical synthesis of alpha-methyl alpha-amino ac
ids with up to 86% enantiomeric excess. (C) 2000 Elsevier Science Ltd. All
rights reserved.