1-Ethyl-2-imino-8-methyl-1,2-dihydro-dipyrido[1,2-b;3',2'-d]pyrazole-3-carboxylic acid ethyl ester; hydrochloride 在
sodium hydroxide 作用下,
以
乙醇 为溶剂,
反应 3.0h,
以91%的产率得到1-Ethyl-2-imino-8-methyl-1,2-dihydro-dipyrido[1,2-b;3',2'-d]pyrazole-3-carboxylic acid ethyl ester