Synthesis of 2-amino-1,3,4-oxadiazoles from isoselenocyanates via cyclodeselenization
                                
                                    
                                        作者:Yuanyuan Xie、Junli Liu、Ping Yang、Xiangjun Shi、Jianjun Li                                    
                                    
                                        DOI:10.1016/j.tet.2011.05.100
                                    
                                    
                                        日期:2011.7
                                    
                                    An efficient one-pot method to access 2-amino-1,3,4-oxadiazoles from isoselenocyanates and hydrazides or dihydrazides was developed via cyclodeselenization. Without any harsh reagents, various 2-amino-1,3,4-oxadiazoles were obtained in considerably high yields (82%-97%) and purities (>99%) directly with simple crystallization in ethanol. And the formed precipitated Se powder during the reaction could be recycled for preparation of isoselenocyanates efficiently. A plausible mechanism is proposed for the formation of the target products. (C) 2011 Elsevier Ltd. All rights reserved.