Gold(I)-Catalyzed Highly Diastereo- and Enantioselective Alkyne Oxidation/Cyclopropanation of 1,6-Enynes
作者:Deyun Qian、Haoxiang Hu、Feng Liu、Bin Tang、Weimin Ye、Yidong Wang、Junliang Zhang
DOI:10.1002/anie.201407717
日期:2014.12.8
A highly enantioselective oxidative cyclopropanation of 1,6‐enynes catalyzed by cationic AuI/chiral phophoramidite complexes is presented. The new method provides convenient access to densely functionalized bicyclo[3.1.0]hexanes bearing three contiguous quaternary and tertiary stereogenic centers with high enantioselectivity (up to e.r. 98:2). Control experiments suggest that the quinoline moiety of
提出了阳离子Au I /手性磷酰胺配合物催化的1,6-烯炔的高度对映选择性氧化环丙烷化反应。该新方法可方便地获得具有三个高对映选择性(最高er 98:2)的稠密官能化双环[3.1.0]己烷,该己烷带有三个连续的季和叔立体异构中心。对照实验表明,反应中β-金乙烯基氧基喹啉鎓中间体的喹啉部分在过渡状态下通过过渡辅助作用在促进良好的对映选择性方面起着重要作用。