Hydrogen evolution-enabled rhodaelectro-catalyzed [4+2] annulations of purines and 7-deazapurines with alkynes
作者:Chao Xu、Zhensheng Zhang、Tao Liu、Wangqin Zhang、Weihui Zhong、Fei Ling
DOI:10.1039/d2cc03625h
日期:——
been developed. Electricity is used to recycle the active rhodium-based catalyst, promote the evolution of H2 and help in reducing the reaction temperature. This mild and green method enables a broad substrate scope and wide functional group tolerance, providing a new series of polycyclic purinium and 7-deazapurinium salts in high yields. Mechanistic studies show that the five-member rhodium(III) species
已经开发了一种铑催化的 6-苯基嘌呤和 6-苯基-7-脱氮嘌呤与炔烃的电化学区域选择性环化。电力用于回收活性铑基催化剂,促进H 2的析出并有助于降低反应温度。这种温和且绿色的方法可实现广泛的底物范围和广泛的官能团耐受性,从而以高产率提供一系列新的多环嘌呤和 7-脱氮嘌呤盐。机理研究表明,五元铑( III ) 和嘌呤异喹啉配位的铑( I ) 配合物是该转化的两个关键中间体。