5-[(E)-3-(4-Dimethylamino-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50%的产率得到5-[5-(4-Dimethylamino-phenyl)-isoxazol-3-ylamino]-4-oxo-3-phenyl-3,4-dihydro-thieno[3,4-d]pyridazine-1-carboxylic acid ethyl ester