BuOK-Promoted Cyclization of Imines with Aryl Halides. 2020

Ya-Wei Li, and Hong-Xing Zheng, and Bo Yang, and Xiang-Huan Shan, and Jian-Ping Qu, and Yan-Biao Kang
Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China.

A transition-metal-free indole synthesis using radical coupling of 2-halotoluenes and imines via the later-stage C-N bond construction was reported for the first time. It includes an aminyl radical generation by C-H cleaving addition of 2-halotoluenes to imines via the carbanion radical relay and an intramolecular coupling of aryl halides with aminyl radicals. One standard condition can be used for all halides including F, Cl, Br, and I. No extra oxidant or transition metal is required.

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