tert-butyl [1-(4-formyl-3-methoxyphenyl)piperidin-4-yl]carbamate 、 4,5-diamino-2-cyclohexyl-6-methylpyridazin-3(2H)-one 在
sulfur 作用下,
以
5,5-dimethyl-1,3-cyclohexadiene 为溶剂,
反应 1.0h,
以60%的产率得到tert-butyl {1-[4-(6-cyclohexyl-4-methyl-7-oxo-6,7-dihydro-1H-imidazo[4,5-d]pyridazin-2-yl)-3-methoxyphenyl]piperidin-4-yl}carbamate