Preparation of 2-Aminopyridoimidazoles and 2-Aminobenzimidazoles via Phosphorus Oxychloride-Mediated Cyclization of Aminoureas
                                
                                    
                                        作者:Rebecca E. Deasy、Catherine N. Slattery、Anita R. Maguire、Douglas P. Kjell、Mai Khanh N. Hawk、Jung Min Joo、Rui Lin Gu、Humphrey Moynihan                                    
                                    
                                        DOI:10.1021/jo500360k
                                    
                                    
                                        日期:2014.4.18
                                    
                                    The novel preparation of 2-aminopyridoimidazoles and 2-aminobenzimidazoles via the cyclization of (2-aminopyridin-3-yl)urea and (2-aminophenyl)urea substrates in the presence of phosphorus oxychloride is described. This methodology is demonstrated for a range of urea substrates with aminoimidazole products obtained in good yields and with excellent levels of purity.