Copper-catalyzed tandem intramolecular cyclization/coupling reaction: solvent effect on reaction pathway
作者:Mitsuaki Yamashita、Toshiaki Noro、Akira Iida
DOI:10.1016/j.tetlet.2013.10.012
日期:2013.12
In this study, we developed direct methods for the synthesis of 3-substituted indoles from o-allcynylan-ilines by utilizing a copper-catalyzed tandem intramolecular cyclization/coupling reaction under mild and simple reaction conditions. Our investigation revealed that choice of the aprotic polar solvents and additives such as camphorsulfonic acid is critical in this reaction. (C) 2013 Elsevier Ltd. All rights reserved.
Cupric Halide-Mediated Intramolecular Halocyclization of N-Electron-Withdrawing Group-Substituted 2-Alkynylanilines for the Synthesis of 3-Haloindoles
作者:Zengming Shen、Xiyan Lu
DOI:10.1002/adsc.200900609
日期:2009.12
efficient method for the synthesis of 3-haloindoles has been developed. Both 3-chloro- and 3-bromoindole derivatives can be obtained in high yields by the reaction of N-electron-withdrawinggroup-substituted2-alkynylanilines with cupric halide in dimethyl sulfoxide (DMSO) within a short period of time. Investigation of the reaction mechanism reveals that two equivalents of cupric halide are necessary