申请人:Warner-Lambert Company
公开号:US05003080A1
公开(公告)日:1991-03-26
An improved process for the preparation of trans-6-[2-(substituted-pyrrol-1-yl)alkyl]pyran-2-ones by a novel synthesis is described where 1,6-heptadien-4-ol is converted in eight operations to the desired products, as well as an improved process for the preparation of (2R-trans) and trans-(.+-.)-5-(4-fluorophenyl)-2-(1-methylethyl)-N-4-diphenyl-1-[2-tetrah ydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1H-pyrrole-3-carboxamide by a novel synthesis where 4-methyl-3-oxo-N-phenylpentanamide is converted in eight operations to the desired product or alternatively 4-fluoro-.alpha.-[2-methyl-1-oxopropyl]-.gamma.-oxo-N,.beta.-diphenylbenze nebutaneamide is converted in one step to the desired product, and additionally, a process for preparing (2R-trans)-5-(4-fluorophenyl)-2-(1-methylethyl)-N,4-diphenyl-1-[2-(tetrahy dro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1H-pyrrole-3-carboxamide from (R)-4-cyano-3-[[(1,1-dimethylethyl)dimethylsilyl]oxy]butanoic acid, as well as other valuable intermediates used in the processes.
本发明描述了一种改进的方法,通过新的合成方法将1,6-庚二烯-4-醇转化为所需产物,制备转-6-[2-(取代吡咯-1-基)烷基]吡喃-2-酮,共进行了八次操作。此外,本发明还描述了一种改进的方法,通过新的合成方法将4-甲基-3-氧代-N-苯基戊酰胺在八次操作中转化为所需产物,或者通过一步将4-氟-.alpha.-[2-甲基-1-氧代丙基]-.gamma.-氧代-N,.beta.-二苯基苯丁酰胺转化为所需产物,制备(2R-转)和转-(.+-.)-5-(4-氟苯基)-2-(1-甲基乙基)-N-4-二苯基-1-[2-四氢-4-羟基-6-氧代-2H-吡喃-2-基)乙基]-1H-吡咯-3-羧酰胺。此外,本发明还描述了一种从(R)-4-氰基-3-[[(1,1-二甲基乙基)二甲基硅氧基]丁酸制备(2R-转)-5-(4-氟苯基)-2-(1-甲基乙基)-N,4-二苯基-1-[2-(四氢-4-羟基-6-氧代-2H-吡喃-2-基)乙基]-1H-吡咯-3-羧酰胺的方法,以及用于该过程中使用的其他有价值的中间体。