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.
Catalyst-free synthesis of benzodiazepines and benzimidazoles using glycerol as recyclable solvent
作者:Catia S. Radatz、Rodrigo B. Silva、Gelson Perin、Eder J. Lenardão、Raquel G. Jacob、Diego Alves
DOI:10.1016/j.tetlet.2011.05.142
日期:2011.8
We described herein the use of glycerol as solvent in the catalyst-free synthesis of benzodiazepines and benzimidazoles. This simple and efficient method furnishes the corresponding 1-H-1,5-benzodiazepines and 1,2-disubstituted benzimidazoles in good yields by the condensation of o-phenylenediamine with several ketones and aldehydes, respectively. In addition, glycerol can be easily re-utilized for
我们在本文中描述了在无催化剂的苯并二氮杂卓和苯并咪唑的合成中甘油作为溶剂的用途。这种简单而有效的方法通过邻苯二胺分别与几种酮和醛缩合,以高收率提供了相应的1 - H -1,5-苯并二氮杂卓和1,2-二取代的苯并咪唑。另外,甘油可以容易地重新用于进一步的缩合反应多达四次而不会失去活性。