Ethyl 4-oxo-3-phenyl-5-(3-phenylprop-2-enoylamino)thieno[3,4-d]pyridazine-1-carboxylate 在
sodium hydroxide 、
盐酸羟胺 作用下,
以
乙醇 为溶剂,
以35%的产率得到4-Oxo-3-phenyl-5-(5-phenyl-isoxazol-3-ylamino)-3,4-dihydro-thieno[3,4-d]pyridazine-1-carboxylic acid ethyl ester