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.
ZrCl<sub>4</sub>-Mediated Regio- and Chemoselective Friedel–Crafts Acylation of Indole
作者:Sankar K. Guchhait、Maneesh Kashyap、Harshad Kamble
DOI:10.1021/jo200561f
日期:2011.6.3
method for regio- and chemoselective Friedel–Crafts acylation of indole using acyl chlorides in the presence of ZrCl4 has been discovered. It minimizes/eliminates common competing reactions that occur due to high and multiatom-nucleophilic character of indole. In this method, a wide range of aroyl, heteroaroyl alkenoyl, and alkanoyl chlorides undergo smooth acylation with various indoles without NH
A novel microwave-irradiated solvent-free 3-acylation of indoles on alumina
作者:Qiu Yu Lai、Rong Su Liao、Shao Yong Wu、Jia Xin Zhang、Xin Hong Duan
DOI:10.1039/c3nj00854a
日期:——
A simple and efficient 3-acylation of indoles under microwave-heated and solvent-free conditions is developed. This general procedure uses neutral Al2O3 as a new, green and reusable catalyst giving good to high yields within short reaction times. Utilizing such an environmentally-benign methodology, a variety of indoles bearing electron-releasing or electron-withdrawing groups were conveniently acylated.
Intramolecular oxidative coupling of 3-indolylarylketones with Pd(II)-catalysis under air: convenient access to indenoindolones
作者:Sankar K. Guchhait、Maneesh Kashyap、Somnath Kandekar
DOI:10.1016/j.tetlet.2012.05.076
日期:2012.7
A Pd-catalyzed method has been developed for the intramolecular oxidative coupling of 3-indolylarylketones under open air as terminal oxidant toward the synthesis of indeno[1,2-b]indol-10(5H)-ones. This reaction represents an intramolecular coupling with dual activation of C-H bonds for electron-deficient arenes, while such reactions are common for electron-rich arenes. Pd(II)-catalysis with pivalic acid as co-catalyst has been found to be crucial. The reaction undergoes without indole N-H-protection. (C) 2012 Elsevier Ltd. All rights reserved.