6-amino-1-(2-methoxybenzyl)pyrimidine-2,4 (1H,3H)-dione 、
Ethyl [5,8-dihydro-2,4(1H,3H)-dioxo-6-ethoxycarbonyl-7-isopropyl-1-(2-methoxybenzyl)-5-(4-tolyl)pyrido[2,3-d]pyrimidine]-3-acetate 在
盐酸 、
sodium hydroxide 作用下,
以
甲醇 为溶剂,
以68%的产率得到5,8-dihydro-2,4-(1H,3H)-dioxo-6-ethoxycarbonyl-7-isopropyl-1-(2-methoxybenzyl)-5-(4-tolyl)pyrido[2,3-d]pyrimidine-3-acetic Acid