劳森试剂 、
Ethyl 3',4'-dihydro-4'-oxospiro[piperidine-4,2'-[1'H]-(pyrido[2,3-d]pyrimidine)]-1-carboxylate 在
silica gel 、
methanol-dichloromethane 作用下,
以
1,4-二氧六环 为溶剂,
反应 2.0h,
以to afford the product as a white solid (0.7 g)的产率得到Ethyl 3',4-dihydro-4'-thioxospiro[piperidine-4,2'-[1'H]-(pyrido[2,3-d]pyrimidine)]-1-carboxylate