Diastereoselective Synthesis of Dibenzo[<i>b</i>,<i>d</i>]azepines by Pd(II)-Catalyzed [5 + 2] Annulation of <i>o</i>-Arylanilines with Dienes
作者:Lu Bai、Yan Wang、Yicong Ge、Jingjing Liu、Xinjun Luan
DOI:10.1021/acs.orglett.7b00503
日期:2017.4.7
An efficient method for the construction of dibenzo[b,d]azepines containing two distinct stereogenic elements in a highly diastereoselective fashion is described. The key of the [5 + 2] reaction is to form a π-allylpalladium species through sequential C–H activation and regiospecific migratory insertion of the diene. This observation contrasts with the behavior of 1,2-alkenes that generally underwent
描述了一种以高度非对映选择性的方式构建包含两个不同的立体异构元素的二苯并[ b,d ] a庚烷的有效方法。[5 + 2]反应的关键是通过连续的C–H活化和二烯的区域特异性迁移插入形成π-烯丙基钯。该观察结果与通常通过β-氢化物消除直接进行烯基化的1,2-烯烃的行为相反。