4-(4-chloro-phenyl)-5,5-dimethyl-2-[3-(4-nitro-phenyl)-ureido]-4,5-dihydro-furan-3-carboxylic acid methyl ester 在
sodium hydroxide 作用下,
以
丙酮 为溶剂,
生成 3-(p-Nitrophenyl)-5-(p-chlorphenyl)-2,4-dioxo-6,6-dimethyl-1,2,3,4,5,6-hexahydro-furo<2,3-d>pyrimidin