申请人:Pfizer Inc.
公开号:US05455350A1
公开(公告)日:1995-10-03
(C.sub.1 -C.sub.3)Alkyl-4,6,7,8,9,9a-hexahydro-2H,3H-pyrido[1,2-a]pyrazin-1-one-7-c arboxylate esters, important precursors to certain bis-aza-bicyclic anxiolytics, can be prepared from di(C.sub.1 -C.sub.3)alkyl cis-piperidine-2,5-dicarboxylate starting material by a new process via a new class of intermediates, di(C.sub.1 -C.sub.3)alkyl cis-N-(2-(phthalimido)ethyl)piperidine-2,5-dicarboxylates. In the process, the starting material is reacted with either 2-(phthalimido)ethyl triflate or 2-(phthalimido)acetaldehyde to form the new intermediate, which can then be cyclized to the aforementioned precursor.
(C.sub.1 -C.sub.3)烷基-4,6,7,8,9,9a-六氢-2H,3H-吡啶[1,2-a]吡嗪-1-酮-7-羧酸酯是某些双氮杂双环类抗焦虑药物的重要前体,可以通过一种新的方法从di(C.sub.1 -C.sub.3)烷基顺式-哌嗪-2,5-二羧酸酯起始物质制备而成,该方法通过一类新的中间体di(C.sub.1 -C.sub.3)烷基顺式-N-(2-(邻苯二甲酰亚胺)乙基)哌嗪-2,5-二羧酸酯。在该过程中,起始物质与2-(邻苯二甲酰亚胺)乙基三氟甲烷或2-(邻苯二甲酰亚胺)乙醛反应形成新的中间体,然后可以环化为上述前体。