8-Cyclopentyl-6-(2-ethoxy-ethyl)-2-methanesulfinyl-8H-pyrido[2,3-d]pyrimidin-7-one 、
4-(6-氨基吡啶-3-基)哌嗪-1-羧酸叔丁酯 在
silica gel 作用下,
以
甲苯 为溶剂,
反应 16.0h,
以to give 4-{6-[8-cyclopentyl-6-(2-ethoxy-ethyl)-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidin-2-ylamino]-pyridin-3-yl}-piperazine-1-carboxylic acid tert-butyl ester as an orange solid (0.328 g, 20.4%)的产率得到4-{6-[8-cyclopentyl-6-(2-ethoxyethyl)-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-ylamino]pyridin-3-yl}piperazine-1-carboxylic acid tert-butyl ester