1-(3-(甲基苯基)哌啶 、 3-(2-氯乙基)-2,7-二甲基-4H-吡啶并[1,2-a]嘧啶-4-酮 在
乙醇 、 异丙醚 作用下,
以
甲苯 为溶剂,
反应 30.0h,
以to give 2 g of the desired compound as pale yellow prisms, m.p. 115 - 116°C.的产率得到2,7-dimethyl-3-[2-(4-m-tolyl-piperazin-1-yl)-ethyl]-pyrido[1,2-a]pyrimidin-4-one
3-[2-(4-PHENYL-1-PIPERAZINYL)ETHYL]-4H-pyrido[1,2-a]pyrimidin-4-one derivatives have central nervous depressant and hypotensive activities and are useful as major tranquillizers. The compounds can be prepared by (a) reacting 2-methyl-3-halogeno (or arylsulfonyloxy or alkylsulfonyloxy)ethyl-4H-pyrido[1,2-a]pyrimidin-4-one derivative with 1-phenylpiperazine derivative or (b) reacting an aminopyridine with 2-[2-(4-phenyl-1-piperazinyl)ethyl]-acetoacetic acid ester.