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Divergent synthesis of 4-amino indoles with free amine groups via tandem reaction of 2-alkynylanilines†
Xiaohua Li,Qiuqin He,Renhua Fan
Organic Chemistry Frontiers Pub Date : 06/28/2022 00:00:00 , DOI:10.1039/D2QO00675H
Abstract

A process for the divergent synthesis of a variety of 4-amino indoles having N1 or C4 free amine groups was reported. This process involves an oxidative dearomatization, an imine exchange, a cascade 1,4-addition/cyclization/aromatization, and a selective deprotection. The formed 4-amino indoles can be converted to 4,7-difunctionalized indoles via selective Friedel–Crafts alkylation.

Graphical abstract: Divergent synthesis of 4-amino indoles with free amine groups via tandem reaction of 2-alkynylanilines
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