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Copper-Catalyzed Cascade Double C3-Indolations of 3‑Diazoindolin-2-imines with Indoles: Convenient Access to 3,3-Diaryl-2-iminoindoles

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posted on 06.03.2015, 00:00 by Zao Du, Yanpeng Xing, Ping Lu, Yanguang Wang
Symmetrical 3,3-diaryl-2-iminoindoles were prepared from 3-diazoindolin-2-imines and indoles via a copper-catalyzed cascade arylation/dehydrogenative cross-coupling process. By controlling the molar ratio of reactants and the operation procedure, 3-aryl-2-aminoindoles and asymmetrical 3,3-diaryl-2-iminoindoles could be approached.