3,4-Bis-ethoxycarbonylmethyl-3a,6a-bis-(4-methoxy-phenyl)-2,5-dioxo-hexahydro-imidazo[4,5-d]imidazole-1,6-dicarboxylic acid di-tert-butyl ester 在
potassium carbonate 作用下,
以
甲醇 为溶剂,
生成
3,4-Bis-carboxymethyl-3a,6a-bis-(4-methoxy-phenyl)-2,5-dioxo-hexahydro-imidazo[4,5-d]imidazole-1,6-dicarboxylic acid di-tert-butyl ester