Chiral amine/chiral acid as an excellent organocatalytic system for the enantioselective tandem oxa-Michael-aldol reaction
作者:Shu-Ping Luo、Zhao-Bo Li、Li-Ping Wang、Yi Guo、Ai-Bao Xia、Dan-Qian Xu
DOI:10.1039/b910835a
日期:——
The asymmetric tandem oxa-Michael-aldol reaction of salicylic aldehyde derivatives with α,β-unsaturated aldehydes catalyzed by a chiral amine/chiral acid organocatalytic system was investigated. The organocatalytic system of (S)-diphenylpyrrolinol trimethylsilyl ether with chiral shift reagent (S)-Mosher acid presented a synergistic effect in the improvement of reaction performance and offered an efficient
研究了水杨醛衍生物与手性胺/手性酸有机催化体系催化的α,β-不饱和醛的不对称串联氧杂-迈克尔-阿尔道反应。(S)-二苯基吡咯啉三甲基甲硅烷基醚与手性转移剂(S)-Mosher酸的有机催化体系在提高反应性能方面具有协同作用,并在转化中提供了有效的空间效应。串联的oxa-Michael-aldol反应以高收率(最高90%)和优异的ee值(最高99%)进行,得到相应的色烯衍生物。还通过1 H NMR研究了原位形成的手性铵盐的结构及其相应的机理。