Chengming Wang, Huan Sun, Yan Fang and Prof. Dr. Yong Huang General and Efficient Synthesis of Indoles through Triazene-Directed C–H Annulation Angewandte Chemie International Edition 52
Unprotected indoles are prepared with the title method, which has a wide scope for alkynes. Excellent regioselectivity was accomplished for aryl–alkyl and alkyl–alkyl disubstituted acetylenes. This reaction features an unusual 1,2 rhodium migration and ring-contraction-triggered NN bond cleavage. It allows rapid conversion of the reaction products into several functional molecules.
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