Palladium(II)-Catalyzed [2+2+1] Annulation of Alkynes and Hydroxylamines: A Rodox-Neutral Approach to Fully Substituted Pyrroles
作者:Jiaxing Bai、Nengni Xu、Hui Wang、Xinjun Luan
DOI:10.1021/acs.orglett.2c01925
日期:2022.7.22
A palladium-catalyzed [2+2+1] annulation of alkynes and hydroxylamines has been developed for the rapid construction of fully substituted pyrroles. This transformation involves sequential nucleophilic-addition of hydroxylamine to alkyne, alkyne migratory insertion, and synergistic demetallization cyclization, which provides a redox-neutral annulation approach to pyrrole derivatives. Moreover, the strategy
已经开发了一种钯催化的炔烃和羟胺的 [2+2+1] 环化,用于快速构建完全取代的吡咯。这种转变包括羟胺与炔烃的顺序亲核加成、炔烃迁移插入和协同脱金属环化,这为吡咯衍生物提供了一种氧化还原中性环化方法。此外,该策略能够通过改变芳基取代基来改变吡咯产物的光物理性质,从而导致开发出N-官能化四芳基吡咯作为新的荧光团。