Tunable<i>Cinchona</i>-Based Thioureas-Catalysed Asymmetric Epoxidation to Synthetically Important Glycidic Ester Derivatives
作者:Sara Meninno、Luca Zullo、Jacob Overgaard、Alessandra Lattanzi
DOI:10.1002/adsc.201700146
日期:2017.3.20
A novel class of synthetically important glycidic esters has been obtained via an asymmetric epoxidation of trans‐α‐cyano‐α,β‐unsaturated esters catalysed by a multifunctional Cinchona alkaloid‐derived thiourea/tert‐butyl hydroperoxide (TBHP) system. The glycidic esters, isolated in excellent yield with complete trans‐diastereocontrol and high enantioselectivity, proved to be versatile building blocks
已经获得了一种新的类合成重要的缩水甘油酯的通过的不对称环氧化反式-α氰基α,通过多官能催化β -不饱和酯金鸡纳生物碱类硫脲/叔丁基过氧化氢(TBHP)系统。缩水甘油酯以极高的收率分离,具有完全的反式-非对映异构控制和高对映选择性,被证明是通向具有四级立体中心的具有挑战性的小目标的通用构建基块。