Copper(II)-Catalyzed [4+1] Annulation of Propargylamines with<i>N</i>,<i>O</i>-Acetals: Entry to the Synthesis of Polysubstituted Pyrrole Derivatives
作者:Norio Sakai、Hiroaki Hori、Yohei Ogiwara
DOI:10.1002/ejoc.201500098
日期:2015.3
Described herein is the CuCl2-catalyzed [4+1] annulation of a variety of propargylamines with N,O-acetals that function as a C1 unit, leading to the production of polysubstituted pyrrole derivatives. Three important features of the N,O-acetal during the [4+1] annulation series via 5-endo-dig cyclization are described: an enolizable substituent adjacent to the central sp3-carbon is required, the central
本文描述的是 CuCl 2 催化的各种炔丙胺与作为 C1 单元的 N,O-缩醛的 [4+1] 环化,导致产生多取代的吡咯衍生物。描述了 N,O-缩醛在通过 5-endo-dig 环化的 [4+1] 环化系列中的三个重要特征:需要与中心 sp3-碳相邻的可烯醇化取代基,中心 sp3-碳显示功能亲电试剂和亲核试剂的分离,仲胺的释放平稳地导致芳构化。