Hydroxylamines As Bifunctional Single-Nitrogen Sources for the Rapid Assembly of Diverse Tricyclic Indole Scaffolds
作者:Liangxin Fan、Jiamao Hao、Jingxun Yu、Xiaojun Ma、Jingjing Liu、Xinjun Luan
DOI:10.1021/jacs.0c00403
日期:2020.4.8
for the construction of n-membered (n>3) N-heterocycles, rely upon two chemical operations by involving sequential nucleophilic and electrophilic C-N bond formations. Here, we report a highly efficient cascade of alkyne insertion/C-H activation/amination for the rapid preparation of a myriad of tricyclic indoles, in a single-step transformation, by using bifunctional secondary hydroxylamines. Noteworthy
使用羟胺衍生物作为单一氮源构建 n 元 (n>3) N-杂环的常规方法依赖于两个化学操作,涉及顺序亲核和亲电 CN 键的形成。在这里,我们报告了一种高效的炔插入/CH 活化/胺化级联,通过使用双功能仲羟胺,在一步转化中快速制备无数的三环吲哚。值得注意的是,明智地选择适用的氨基试剂,使芳基碘化物能够预先氧化加成到初始 Pd(0) 物种并随后形成两个 CN 键,是该反应成功的关键。对照实验表明,五元钯环中间体在促进最终胺化环闭合方面起着至关重要的作用。