Synthesis of 1,2-disubstitued benzimidazoles using SiO2/ZnCl2
作者:Raquel G. Jacob、Luiz G. Dutra、Cátia S. Radatz、Samuel R. Mendes、Gelson Perin、Eder J. Lenardão
DOI:10.1016/j.tetlet.2009.01.076
日期:2009.4
A general and easy method for the synthesis of several 1,2-disubstituted benzimidazoles using SiO2/ZnCl2 and solvent-free conditions is described, This efficient and improved method furnishes selectively and in good yields the corresponding 1,2-bis(organyl)-benzimidazoles starting from o-phenylenediamine and aromatic or aliphatic aldehydes. The catalytic system was re-Used up three times and the use of focused microwaves accelerates the reaction. (C) 2009 Elsevier Ltd. All rights reserved.