methyl hexahydro-1,3-dioxo-1H-1,2,4-triazolo[1,2-a]-pyridazine-5-carboxylate 、
potassium tert-butylate 、
2-溴乙酸苄酯 在
氮气 、 silica gel 、
dichloromethane hexane 作用下,
以
叔丁醇 为溶剂,
反应 8.0h,
以to give 1.32 g (52%) of benzyl 5-methoxycarbonyl-2,3,5,6,7,8-hexahydro-1,3-dioxo-1H-1,2,4-triazolo[1,2-a]pyridazine-2-acetate of melting point 103°-106° C. (from dichloromethane/hexane)的产率得到benzyl 5-methoxycarbonyl-2,3,5,6,7,8-hexahydro-1,3-dioxo-1H-1,2,4-triazolo[1,2-a]pyridazine-2-acetate