3,4-dimethyl-7-phenyl-6-thioxo-6,7-dihydropyrimido[4',5':4,5]thieno[2,3-c]pyridazin-8(5H)-one 、 alkaline earth salt of/the/ methylsulfuric acid 在
sodium acetate 作用下,
以
乙醇 为溶剂,
反应 3.0h,
以69%的产率得到methyl 2-((3,4-dimethyl-8-oxo-7-phenyl-7,8-dihydropyrimido[4',5':4,5]thieno[2,3-c]pyridazin-6-yl)thio)propanoate