Unexpected cyclization route for o-ethynylbenzoic acids hydrazides in the presence of base
                                
                                    
                                        作者:S. F. Vasilevsky、T. F. Mikhailovskaya                                    
                                    
                                        DOI:10.1007/s10593-009-0225-7
                                    
                                    
                                        日期:2009.1
                                    
                                    The reaction of o-ethynylbenzoic acids hydrazides with base has been studied. In the presence of a strong donor substituent (1,5-dimethylpyrazol-4-yl) it has been found that an unusual cyclization route occurs to give the corresponding benzopyridazinone instead of the expected isoindolinone.