3,8-dimethyl-4,7-dioxo-3,4,7,8-tetrahydropyrido[2,3-d]pyrimidin-5-yl 4-methylbenzenesulfonate 、
2-氟-4-碘苯胺 反应 2.0h,
以to yield 5-(2-fluoro-4-iodophenylamino)-3,8-dimethylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione (Example 1)的产率得到5-(2-fluoro-4-iodophenylamino)-3,8-dimethylpyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione