<i>N,N′</i>-Dioxide-Scandium(III)-Catalyzed Asymmetric Michael Addition of β,γ-Unsaturated Butenolides to α,β-Unsaturated γ-Keto Esters
作者:Jie Ji、Lili Lin、Lin Zhou、Yuheng Zhang、Yangbin Liu、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/adsc.201300586
日期:2013.10.11
AbstractA highly efficient N,N′‐dioxide–scandium(III) complex catalytic system has been developed for the asymmetric vinylogous Michael reaction of α‐angelica lactone and its derivatives to α,β‐unsaturated γ‐keto esters, affording the corresponding γ,γ‐disubstituted butenolide products in moderate to good yields (up to 93%) with high dr (up to >19:1) and ee values (up to 97%) under mild reaction conditions.magnified image