Synthesis of Carbazoles by Copper-Catalyzed Intramolecular C–H/N–H Coupling
摘要:
A Cu-catalyzed intramolecular C-H amination for the synthesis of carbazoles has been developed. The key to success is the installation of the picolinamide-based directing group, which is spontaneously removed after the coupling event. The Cu catalysis proceeded smoothly under Pd- and I(III)-free conditions, and its mild oxidation aptitude enables the rapid and concise construction of heteroatom-incorporated carbazole core pi-systems.
Unactivated olefins usually react poorly in conventional alkenylation reactions. Their introduction via C-H activation is limited to aromatic acids. Herein, we disclose a C-H functionalization protocol of aromatic amines with unactivated olefins, which shows exclusive allylic selectivity for the distal ring of the biphenyl system by exploiting a readily available cobalt(II) catalyst. The allylation
Palladium-catalyzed distal selective C–H chalcogenation of biphenyl amines
作者:Yunhao Zhou、Tao Zheng、Yue Xu、Bo Li、Yuchi Wang、Ruhuai Mei、Linghui Gu、Wenbo Ma
DOI:10.1039/d3cc02209a
日期:——
demonstrates scalability, excellent chemo- and regio-selectivity, and broad functional group tolerance, providing efficient access to valuable aryl chalcogenides. Notably, the chalcogenated biphenyl amines could be further transformed to 8-membered N, Se(S)-heterocycles through copper-catalyzed intramolecular C–N cyclization.