Copper-catalyzed coupling of imidazoles and pyrazoles with 1,1-dibromo-1-alkenes: a distinct approach for direct N-alkynylation of heteroarenes
作者:Biswanath Das、N. Salvanna、Gandolla Chinna Reddy、Penagaluri Balasubramanyam
DOI:10.1016/j.tetlet.2011.09.117
日期:2011.11
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.