InBr<sub>3</sub>-Promoted Divergent Approach to Polysubstituted Indoles and Quinolines from 2-Ethynylanilines: Switch from an Intramolecular Cyclization to an Intermolecular Dimerization by a Type of Terminal Substituent Group
Use of a 2-ethynylaniline having an alkyl or aryl group on the terminal alkyne selectively produced a variety of polyfunctionalized indole derivatives in moderate to excellent yields via indium-catalyzed intramolecular cyclization of the corresponding alkynylaniline. In contrast, employment of a substrate with a trimethylsilyl group or with no substituent group on the terminal triple bond, exclusively
[Cp∗IrCl2]2-catalysed cyclization of 2-alkynylanilines into indoles
作者:Elumalai Kumaran、Weng Kee Leong
DOI:10.1016/j.tetlet.2014.08.053
日期:2014.10
[Cp*IrCl2](2) catalyses the cyclization of 2-alkynylanilines into indoles. A wide variety of substrates is tolerated. A reaction pathway involving intramolecular hydroamination is proposed. (C) 2014 Elsevier Ltd. All rights reserved.