Asymmetric Conjugate Alkynylation of Cyclic α,β-Unsaturated Carbonyl Compounds with a Chiral Diene Rhodium Catalyst
作者:Xiaowei Dou、Yinhua Huang、Tamio Hayashi
DOI:10.1002/anie.201509778
日期:2016.1.18
Asymmetric conjugate alkynylation of cyclic α,β‐unsaturated carbonyl compounds (ketones, esters, and amides) was realized by use of diphenyl[(triisopropylsilyl)ethynyl]methanol as an alkynylating reagent in the presence of a rhodium catalyst coordinated with a new chiral diene ligand (Fc‐bod; bod=bicyclo[2.2.2]octa‐2,5‐diene, Fc=ferrocenyl) to give high yields of the corresponding β‐alkynyl‐substituted
环状α,β-不饱和羰基化合物(酮,酯和酰胺)的不对称共轭烷基化反应是通过在有新型手性二烯配位的铑催化剂存在下,用二苯基[(三异丙基甲硅烷基)乙炔基]甲醇作为烷基化试剂来实现的。配体(Fc-bod; bod =双环[2.2.2] octa-2,5-二烯,Fc =二茂铁基)得到高收率的ee -95%至98%的相应β-炔基取代的羰基化合物。