摘要:
An asymmetric synthesis of N-protected (4S)-4-hydroxy L-glutamic acid diester is described. The key feature of the synthesis is the asymmetric 1,3-dipolar cycloaddition of nitrone 4 with 5, which provides stereoselectively the isoxazolidine with the correct stereochemistry suitable for the synthesis of N-protected (4S)-4-hydroxy L-glutamic acid diester 1. Copyright (C) 1996 Elsevier Science Ltd