A new synthesis of indoles via intramolecular cyclization of ο-alkynyl N,N-dialkylanilines promoted by KOt-Bu/DMSO
摘要:
2-Aryl indoles could be prepared in excellent yields via the intramolecular cyclization of o-alkynyl N,N-dialkylanilines. The reaction is efficiently promoted by the catalytic amount of KOr-Bu in DMSO at room temperature. A reaction mechanism involving alpha-aminoalkyl radical intermediates is suggested. (C) 2012 Elsevier Ltd. All rights reserved.
Preparation of 2,3-disubstituted indoles by sequential Larock heteroannulation and silicon-based cross-coupling reactions
作者:Scott E. Denmark、John D. Baird
DOI:10.1016/j.tet.2008.10.043
日期:2009.4
A simple and convergent synthesis of 2,3-disubstituted indoles has been developed using a sequential Larock indole synthesis and silicon-based, cross-coupling reaction. Substituted 2-iodoanilines reacted with an alkynyldimethylsilyl tert-butylether to afford indole-2-silanols under the Larock heteroannulation conditions after hydrolysis. The corresponding sodium 2-indolylsilanolate salts successfully