Regioselective Pd-catalyzed indolization of 2-bromoanilines with internal alkynes using phosphine-free ligands
作者:Xin Cui、Juan Li、Yao Fu、Lei Liu、Qing-Xiang Guo
DOI:10.1016/j.tetlet.2008.03.112
日期:2008.5
The possibility of using phosphine-free ligands to promote Pd-catalyzed indolization of 2-bromoanilines with internal alkynes was examined for the first time. Phenylurea was found to be the optimal ligand, which could mediate the synthesis of 2,3 -disubstituted indoles in good yields (ca. 60-85%) with high regioselectivity. (C) 2008 Elsevier Ltd. All rights reserved.