Synthesis of Indoles by Conjugate Addition and Ligand-Free Copper-Catalyzed Intramolecular Arylation of Activated Acetylenes with o-Haloanilines
作者:Detian Gao、Masood Parvez、Thomas G. Back
DOI:10.1002/chem.201002628
日期:2010.12.27
and efficient new synthesis of variously functionalized and substituted indoles was achieved by the addition and copper‐catalyzed coupling of N‐formyl‐o‐haloanilines with acetylenicsulfones, esters and ketones (see scheme; EWG=electron‐withdrawing group). The reaction employs copper(II) acetate under ligand‐free conditions without the need for exclusion of air and moisture.