[6-Ethoxycarbonylmethyl-3,4-bis-(4-methoxy-benzyl)-2,5-dioxo-3a,6a-di-p-tolyl-hexahydro-imidazo[4,5-d]imidazol-1-yl]-acetic acid ethyl ester 在
ammonium cerium(IV) nitrate 作用下,
以
乙腈 为溶剂,
以60%的产率得到(6-Ethoxycarbonylmethyl-2,5-dioxo-3a,6a-di-p-tolyl-hexahydro-imidazo[4,5-d]imidazol-1-yl)-acetic acid ethyl ester