Synthesis of 1<i>H</i>-Indazoles and 1<i>H</i>-Pyrazoles via FeBr<sub>3</sub>/O<sub>2</sub> Mediated Intramolecular C–H Amination
                                
                                    
                                        作者:Tianshui Zhang、Weiliang Bao                                    
                                    
                                        DOI:10.1021/jo3026862
                                    
                                    
                                        日期:2013.2.1
                                    
                                    A new synthesis of substituted 1H-indazoles and 1H-pyrazoles from arylhydrazones via FeBr3/O-2 mediated C-H activation/C-N bond formation reactions is reported. The corresponding 1,3-diaryl-substituted indazoles and trisubstituted pyrazoles were obtained in moderate to excellent yields under mild conditions.