diethyl (1-butyl-2,5-dioxo-4-imidazolyl)phosphonate 、 1,1-dimethylethyl 4-<(2-butyl-5-formyl-1H-imidazol-1-yl)methyl>benzoate 在
1.) 1,8-diazabicyclo<4.4.0>undec-7-ene 作用下,
生成 1,1-dimethylethyl (E)-4-<<2-butyl-5-<(1-butyl-2,5-dioxo-4-imidazolidinylidene)methyl>-1H-imidazol-1-yl>methyl>benzoate 、
1,1-dimethylethyl (Z)-4-<<2-butyl-5-<(1-butyl-2,5-dioxo-4-imidazolidinylidene)methyl>-1H-imidazol-1-yl>methyl>benzoate