5-[(E)-3-(4-Hydroxy-phenyl)-acryloylamino]-4-oxo-3-phenyl-3,4-dihydro-thieno[3,4-d]pyridazine-1-carboxylic acid ethyl ester                                                                                                                                                              在
                                                                                                                                                                                 
sodium hydroxide   、                                                                                                  
盐酸羟胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                                                        以65%的产率得到5-[5-(4-Hydroxy-phenyl)-isoxazol-3-ylamino]-4-oxo-3-phenyl-3,4-dihydro-thieno[3,4-d]pyridazine-1-carboxylic acid ethyl ester