Phosphine-Catalyzed Annulations between Modified Allylic Derivatives and Polar Dienes and Substituent Effect on the Annulation Mode
作者:Junjun Tian、Haiyun Sun、Rong Zhou、Zhengjie He
DOI:10.1002/cjoc.201300646
日期:2013.10
In this work, the phosphine‐catalyzed annulation reactions between modified allylic derivatives and polar 1,1‐dicyano‐1,3‐dienes have been studied. In the catalysis of PPh3 (20 mol%), a [4+1] annulation reaction is realized between a series of 1,1‐dicyano‐2,4‐diaryl‐1,3‐dienes and ethoxycarbonyl‐activated allylic acetate, producing polysubstituted cyclopentenes in modest to excellent yields. It is
在这项工作中,研究了改性烯丙基衍生物与极性1,1-二氰基-1,3-二烯之间的膦催化的环化反应。在PPh 3(20 mol%)的催化中,在一系列1,1-二氰基-2-2,4-二芳基-1,3-二烯与乙氧基羰基活化的乙酸烯丙酯之间实现了[4 + 1]环化反应,以适中至优异的产率生产多取代的环戊烯。还观察到1,3-二烯和烯丙基衍生物的取代基均对环化方式有重大影响:在PPh 3或PBu 3(20 mol%)的催化下,区域选择性[3 + 2]环化产物为由不同取代的底物形成。