Asymmetric Michael Addition Reactions between 3-Substituted Benzofuran-2(3H)-ones and 1,1-Bis(phenylsulfonyl)ethylene Catalyzed by Bifunctional Catalysts Containing Tertiary Amine and Thiourea Groups
作者:Xin Li、Yue-Yan Zhang、Xiao-Song Xue、Jia-Lu Jin、Bo-Xuan Tan、Cong Liu、Nan Dong、Jin-Pei Cheng
DOI:10.1002/ejoc.201101765
日期:2012.3
Highly enantioselective catalytic conjugate additions of 3-substituted benzofuran-2(3H)-ones to 1,1-bis(phenylsulfonyl)ethylene in the presence of catalysts based on Cinchona alkaloids and containing tertiary amine and thiourea groups have been developed. Good to excellent stereoselectivities (up to 99 % ee) could be achieved. An interesting effect of substituent positions on stereoselectivities was
在基于金鸡纳生物碱并含有叔胺和硫脲基团的催化剂存在下,高度对映选择性催化共轭加成 3-取代苯并呋喃-2(3H)-酮到 1,1-双(苯磺酰基)乙烯。可以实现良好到出色的立体选择性(高达 99% ee)。观察到取代位置对立体选择性的有趣影响,并进行了解释这种现象的理论研究。