An improved process for the preparation of trans-6-[2-(substituted-pyrrole-1-yl)alkyl]pyran-2-ones by a novel synthesis is described where .alpha.-metalated N,N-disubstituted acetamide is converted in seven operations to the desired products, and specifically, 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, as well as other valuable intermediates used in the processes and prodrugs which are bioconverted to hypolipidemic and hypocholesterolemic agents and pharmaceutical compositions of the same.
本文描述了一种改进的方法,通过一种新的合成方法制备转-6-[2-(取代
吡咯-1-基)烷基]
吡喃-2-酮,其中α-
金属化的N,N-二取代乙酰胺经过七个步骤转化为所需的产物,具体地,一种制备(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,以及用于该过程和
生物转化为降血脂和降
胆固醇药剂的其他有价值的中间体和前药的方法和制药组合物。