Enantioselective addition of thiophenylboronic acids to aldehydes using ZnEt2/Schiff-base catalytic system
作者:Xiaodong Liu、Li Qiu、Liang Hong、Wenjing Yan、Rui Wang
DOI:10.1016/j.tetasy.2009.02.059
日期:2009.3
Using Schiff-base amino alcohols as catalysts which were readily derived from natural amino acids in three steps, a series of valuable optically active thiophenyl methanols (4a-4n) were first obtained in good yields and high enantioselectivities (up to 96% ee) through the asymmetric addition of thiophenylboronic acid to aldehydes in the presence of ZnEt2 in toluene. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.