1,4-dimethylpyridinium bromide 、
1-Butyl-2,6-dioxo-5-phenylaminomethylene-1,2,5,6-tetrahydropyridine-3-carbonitrile 在
potassium acetate 、
乙酸酐 作用下,
反应 2.0h,
生成 1-Butyl-4-methyl-5-[2-(1-methyl-1H-pyridin-4-ylidene)ethylidene]-2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carbonitrile