3-(2,4-difluorophenyl)-propanimidamide 、
ethyl (2,4-dioxo-3,4-dihydropyrido[2,3-d]pyrimidin-1(2H)-yl)acetate 以
正己烷 、
4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 为溶剂,
生成 ethyl [2-[2-(2,4-difluorophenyl)ethyl]-4-oxopyrido[2,3-d]pyrimidin-1(4H)-yl]acetate