A new efficient synthesis of pyrazoles from hydrazonoyl halides and β-oxophosphonates
                                
                                    
                                        作者:Aixue Sun、Jia-Hai Ye、Haitao Yu、Wenchao Zhang、Xiaolong Wang                                    
                                    
                                        DOI:10.1016/j.tetlet.2013.12.045
                                    
                                    
                                        日期:2014.1
                                    
                                    A new practical and efficient synthesis of 1,3,5-trisubstituted pyrazoles has been developed by reacting of hydrazonoyl halides with beta-oxophosphonates under mild conditions in good yields with excellent regioselectivity. This process employs an addition-elimination sequence. Wide scope, functional group compatibility has been established. (C) 2013 Elsevier Ltd. All rights reserved.