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,通过一种新的合成方法,将
1,6-庚二烯-4-醇转化为所需的产物,从而制备出改良的转-6-[2-(取代
吡咯-1-基)烷基]
吡喃-2-酮。此外,本发明还描述了一种改进的方法,通过一种新的合成方法,将4-甲基-3-氧代-N-苯基戊酰胺在八个步骤中转化为所需的产物,或者将4-
氟-α-[2-甲基-1-氧代丙基]-γ-氧代-N,β-二苯基苯基丁酰胺在一步中转化为所需的产物,用于制备(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,以及用于该过程中使用的其他有价值的中间体。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。