5-(4-Fluoro-phenyl)-1,3,7-trimethyl-2,4-dioxo-1,2,3,4,5,8-hexahydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester 在
硝酸 作用下,
反应 3.0h,
以79.7%的产率得到ethyl 5-(4-fluorophenyl)-1,2,3,4-tetrahydro-1,3,7-trimethyl-2,4-dioxopyrido<2,3-d>pyrimidine-6-carboxylate