An efficient Cu-catalyzed decarboxylative C3-acylation of free (NâH) indoles using α-oxocarboxylic acids as acylating agents has been developed. This method was compatible with a variety of functional groups and provided an attractive alternative access to 3-acylindoles in moderate to high yields.
Synthesis of 3-Acylindoles by Palladium-Catalyzed Acylation of Free (N–H) Indoles with Nitriles
作者:Tao-Shan Jiang、Guan-Wu Wang
DOI:10.1021/ol303440y
日期:2013.2.15
An efficient palladium-catalyzed synthesis of 3-acylindoles using free (N–H) indoles and nitriles has been developed. The acylation reaction proceeded well under the Pd(OAc)2/2,2′-bipyridine system and with d-(+)-camphorsulfonic acid as the additive. A possible mechanism involving carbopalladation of nitriles and subsequent hydrolysis of ketimines is proposed.
An efficient regioselective C-3 acylation of free indoles (N-H) has been accomplished via oxidative decarbethoxylation of easily available ethyl arylacetates using Cu(OAc)2 and KOtBu in DMSO.