A Keggin heteropoly acid as an efficient catalyst for an expeditious, one-pot synthesis of 1-methyl-2-(hetero)arylbenzimidazoles
                                
                                    
                                        作者:Manas Chakrabarty、Ajanta Mukherji、Ratna Mukherjee、Shiho Arima、Yoshihiro Harigaya                                    
                                    
                                        DOI:10.1016/j.tetlet.2007.05.144
                                    
                                    
                                        日期:2007.7
                                    
                                    The Keggin heteropoly acid, silicotungstic acid, H4SiW12O40, has been demonstrated to be highly efficient for an expeditious, one-pot synthesis of 1-methyl-2-(hetero)arylbenzimidazoles from N-methyl-1,2-phenylenediamine and (hetero)aryl aldehydes in ethyl acetate at room temperature. The catalyst works equally well for N-phenyl-1,2-phenylenediamine. (c) 2007 Elsevier Ltd. All rights reserved.