Synthesis 2007(20): 3205-3210  
DOI: 10.1055/s-2007-990797
PAPER
© Georg Thieme Verlag Stuttgart · New York

Indium(III) Bromide Catalyzed Rapid Propargylation of Heteroaromatic Systems by α-Aryl-Substituted Propargyl Alcohols

J. S. Yadav*, B. V. Subba Reddy, K. V. Raghavendra Rao, G. G. K. S. Narayana Kumar
Division of Organic Chemistry, Indian Institute of Chemical Technology, Hyderabad 500007, India
Fax: +91(40)27160512; e-Mail: yadavpub@iict.res.in;
Further Information

Publication History

Received 6 July 2007
Publication Date:
21 September 2007 (online)

Abstract

A variety of heteroaromatic compounds such as indole, carbazole, pyrrole, and furan underwent smooth coupling with propargylic alcohols in the presence of 10 mol% of indium(III) bromide under mild conditions to furnish exclusively propargylated heterocycles in excellent yields and high regioselectivity. The use of indium(III) bromide makes this procedure simple, convenient, and practical. The hydroxy groups of the propargylic alcohols were simply replaced by the nucleophiles in an SN2′ manner.