Phosphine-catalyzed [4 + 2] annulation and vinylogous addition reactions between 1,4-dien-3-ones and 1,1-dicyanoalkenes
作者:Rong Zhou、Jianfang Wang、Junjun Tian、Zhengjie He
DOI:10.1039/c1ob06187a
日期:——
Phosphine-catalyzed [4 + 2] annulation and vinylogous Michael additionreactionsbetween 1,4-dien-3-ones and 1,1-dicyanoalkenes are presented. Under the catalysis of PBu3 (20 mol %), 1,4-dien-3-ones like styryl ketones with 2-aryl 1,1-dicyanoalkenes as doubly activated alkenes readily undergo a formal [4 + 2] cycloaddition reaction, affording polysubstituted cyclohexanones in satisfactory yield and