Synthesis of 2-Amino-1,3,4-oxadiazoles and 2-Amino-1,3,4-thiadiazoles via Sequential Condensation and I<sub>2</sub>-Mediated Oxidative C–O/C–S Bond Formation
                                
                                    
                                        作者:Pengfei Niu、Jinfeng Kang、Xianhai Tian、Lina Song、Hongxu Liu、Jie Wu、Wenquan Yu、Junbiao Chang                                    
                                    
                                        DOI:10.1021/jo502518c
                                    
                                    
                                        日期:2015.1.16
                                    
                                    2-Amino-substituted 1,3,4-oxadiazoles and 1,3,4-thiadiazoles were synthesized via condensation of semicarbazide/thiosemicarbazide and the corresponding aldehydes followed by I-2-mediated oxidative C-O/C-S bond formation. This transition-metal-free sequential synthesis process is compatible with aromatic, aliphatic, and cinnamic aldehydes, providing facile access to a variety of diazole derivatives bearing a 2-amino substituent in an efficient and scalable fashion.