6-(p-aminophenyl)-4,5-dihydro-dihydro-5-methyl-3(2H)-pyridazinone 、
氯甲酸甲酯 在
甲苯 、
水 、
dimethylformamide hydrate 作用下,
以
甲苯 为溶剂,
反应 6.0h,
以3.1 g (40% of theory) of 4,5-dihydro-6-(p-methoxycarbonylaminophenyl)-5-methyl-3(2H)-pyridazinone are obtained as colorless crystals, of melting point 228°-229° C.的产率得到4,5-dihydro-6-(p-methoxycarbonylaminophenyl)-5-methyl-3(2H)-pyridazinone