trans-1,2-diacetoxy-1,2-dihydrobenzocyclobutene 、
methyl 1,2,3,4,5,8-hexahydro-5,8-dioxonaphthalene-2-carboxylate 在
氮 、
乙醚 作用下,
以
邻二甲苯 为溶剂,
反应 18.0h,
以to give 260 mg (81%) of methyl rac-1,2,3,4,5,12-hexahydro-5,12-dioxonaphthacene-2-carboxylate in the form of a bright yellow solid of melting point 173°-174° C.的产率得到methyl 1,2,3,4,5,12-hexahydro-5,12-dioxonaphthacene-2-carboxylate