Synthesis 2008(6): 887-890  
DOI: 10.1055/s-2008-1032193
PAPER
© Georg Thieme Verlag Stuttgart · New York

Acetylation of N-Heteroaryl Bromides via PdCl2/(o-tolyl)3P Catalyzed Heck Reactions

Tianxiong Hea, Xiaochun Tao*a, Xinyan Wua, Lisheng Cai*b, Victor W. Pikeb
a Laboratory of Organometallic Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. of China
b Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA
e-Mail: LishengCai@mail.nih.gov; e-Mail: xctao@ecust.edu.cn;
Further Information

Publication History

Received 24 October 2007
Publication Date:
28 February 2008 (online)

Abstract

A new user-friendly and convenient method for the acetylation of N-heteroaryl bromides is described. This process is based on the palladium-catalyzed olefination of an N-heteroaryl bromide with butyl vinyl ether, followed by acid hydrolysis of the intermediate heteroaryl vinyl ether in situ. Isopropanol at 85 °C, in the presence of K3PO4·3H2O (2 equiv), PdCl2 (2 mol%) and (o-tolyl)3P (4 mol%), provided the best conditions, giving yields of N-heteroaryl bromides up to 75%.