Efficient Synthesis of 1,1‘-Binaphthyl and 2,2‘-Bi-o-tolyl-2,2‘-bis(oxazoline)s and Preliminary Use for the Catalytic Asymmetric Allylic Oxidation of Cyclohexene
Synthesis of chiral S , N -thioimidazoline ligands for palladium-catalyzed asymmetric allylic alkylations
作者:Xin-Qi Hao、Ming-Zhan Shen、Ning-Ge Jian、Wei Pang、Xiao-Jing Shen、Xinju Zhu、Mao-Ping Song
DOI:10.1016/j.tetasy.2016.01.015
日期:2016.3
A series of chiral S,N-thioimidazoline ligands have been synthesized using 2-bromobenzoic acid or 1-bromo-2-naphthoic acid as starting materials. The obtained ligands were evaluated in the Pd-catalyzed asymmetric allylic alkylations and exhibited high catalytic efficiency: yields of up to 94% and enantioselectivities of up to 86% were achieved under the optimized conditions. (C) 2016 Elsevier Ltd. All rights reserved.