The Enantioselective Synthesis of <i>anti</i>-<i>β</i>-Hydroxy-<i>α</i>-Amino Acids <i>via</i> the Reaction of Lithium Enolates of Glycine Bearing an Oxazolidine Chiral Auxiliary with Aldehydes
作者:Edwin J. Iwanowicz、Peter Blomgren、Peter T. W. Cheng、Kennith Smith、Wan F. Lau、Yolanda Y. Pan、Henry H. Gu、Mary F. Malley、Jack Z. Gougoutas
DOI:10.1055/s-1998-1736
日期:1998.6
A new anti-selective aldol reaction utilizing 2,4-disubstituted oxazolidine functionalized-glycine ester 1 is described. The corresponding lithium enolate of 1, has been demonstrated to undergo a highly anti-diastereoselective aldol reaction with a variety of aldehydes. Facile removal of the chiral auxiliary allows for the efficient preparation of chiral β-hydroxy-α-amino acids of erythro stereochemistry.
本文描述了一种利用 2,4-二取代噁唑烷官能化甘氨酸酯 1 的新型反选择性醛醇反应。实验证明,1 的相应锂烯醇盐能与多种醛发生高度反双侧选择性的醛醇反应。通过轻松去除手性辅助剂,可以高效制备具有赤式立体化学性质的手性δ-²-羟基δ-±-氨基酸。