The direct N-alkynylation of heteroarenes, imidazoles, and pyrazoles with 1,1-dibromo-1-alkene has been carried out for the first time using [Cu(Phen)PPh3Br] (as a catalyst) and Cs2CO3 in DMSO at 80 degrees C. The products are formed in good to high yields (66-85%) within 3 h. No side products could be detected. (C) 2011 Elsevier Ltd. All rights reserved.
Coupling Reactions of Bromoalkynes with Imidazoles Mediated by Copper Salts: Synthesis of Novel <i>N</i>-Alkynylimidazoles
作者:Christophe Laroche、Jing Li、Matthew W. Freyer、Sean M. Kerwin
DOI:10.1021/jo801118q
日期:2008.8.1
A cross-coupling reaction of imidazoles with bromoalkynes in the presence of a catalytic amount of CuI is reported. This protocol allows an access to novel N-(1-alkynyl)imidazoles in moderate to good yields.