Divergent Construction of Fully Substituted Pyrroles and Cyclopentadiene Derivatives by Ynamide Annulations: 1,2-Cyclopropyl Migration versus Proton Transfer
作者:Wenqing Zang、Yin Wei、Min Shi
DOI:10.1021/acs.orglett.0c01819
日期:2020.7.17
cyclopropyl ynamide cyclization to construct fully substituted pyrroles and cyclopentadiene derivatives in the presence of a gold catalyst was developed. In this version of pyrrole generation, a novel method to furnish gold vinylidenes through [1,2]-cyclopropyl migration was described. On the contrary, the production of cyclopentadienes proceeded through a proton-transfer step. These intriguing mechanisms
在金催化剂的存在下,开发了可切换的环丙基乙酰胺环化反应以构建完全取代的吡咯和环戊二烯衍生物。在此版本的吡咯中,描述了一种通过[1,2]-环丙基迁移提供亚乙烯基金的新方法。相反,环戊二烯的生产通过质子转移步骤进行。这些有趣的机制是基于炔基烯胺中间体的结构鉴定和交叉实验提出的。还研究了环丁基炔酰胺通过扩环特异性构建环戊二烯的可行性。