ethyl 6-benzyl-6,13-dihydro-9,12-dihydroxy-7-methyl-5,13-dioxo-5H-dibenzo[c,f]azonine-8-carboxylate 在
sodium sulfate 、
silver(l) oxide 作用下,
以
乙醚 为溶剂,
反应 2.0h,
以70%的产率得到ethyl 6-benzyl-6,9,12,13-tetrahydro-7-methyl-5,9,12,13-tetraoxo-5H-dibenzo[c,f]azonine-8-carboxylate