Diastereoselective allylation of chiral imines and a stereocontrolled route to 4-hydroxy-N-tosylpipecolic acid derivatives
作者:Anna Kulesza、Adam Mieczkowski、Janusz Jurczak
DOI:10.1016/s0957-4166(02)00542-6
日期:2002.9
We report an asymmetric route to non-proteogenic amino acids, based on Lewis acid-mediated diastereoselective additions of allyltrimethylsilane to iminoglyoxylic acid derivatives bearing ester or amide chiral auxiliaries. Reactions of allyltrimethylsilane with N-tosyl- and N-phenyliminoglyoxylates of (R)-8-phenylmenthol proceeded with excellent diastereoselectivity (d.e. 98%). In contrast, the reactions of N-benzyliminoglyoxylates occurred with low diastereoselectivities and in poor yields. We have applied our methodology to develop a short synthesis of (2S,4R)-4-hydroxypipecolic acid derivatives. (C) 2002 Published by Elsevier Science Ltd.