A process for the synthesis of compounds of the formulas Ia and Ib below, wherein R.sub.1, R.sub.2, and R.sub.3, which are the same or different, are each selected from hydrogen and C.sub.1 -C.sub.4 alkyl, including the compound Anabaseine (Ia, wherein R.sub.1 =R.sub.2 R.sub.3 =H) (3,4,5,6-tetrahydro-2', 3'-bipyridine), the process comprising reacting sodium salt of .delta.-valerolactone with substituted ethyl nicotinate derivative to produce the Claisen product sodium 3-nicotinoyl-2-tetrahydropyranone enolate derivative, heating the sodium 3-nicotinoyl-2-tetrahydropyranone enolate derivative with concentrated HCl to produce 3-(5-chloro-1-pentanone-1-yl) pyridine derivative, dissolving the 3-(5-chloro-1-pentanone-1-yl) pyridine derivative in ethanol and then heating the 3-(5-chloro-1-pentanone-1-yl) pyridine derivative in ethanol with ethanolic ammonia solution in a sealed container to produce the compound Ia. Also, the process steps in the above process, and the products and intermediate products produced thereby. ##STR1##
以下为化合物Ia和Ib的合成方法,其中R.sub.1、R.sub.2和R.sub.3,它们相同或不同,均选择自氢和C.sub.1-C.sub.4烷基,包括化合物Anabaseine(Ia,其中R.sub.1=R.sub.2=R.sub.3=H)(3,4,5,6-四氢-2',3'-联
吡啶),该过程包括将.delta.-
戊内酯钠盐与取代的乙基
烟酸酯衍
生物反应,以产生Claisen产物
钠3-烟酰基-2-
四氢吡喃酮烯醇衍
生物,将
钠3-烟酰基-2-
四氢吡喃酮烯醇衍
生物与浓
盐酸加热,以产生3-(5-
氯-1-戊酮-1-基)
吡啶衍生物,将3-(5-
氯-1-戊酮-1-基)
吡啶衍生物溶解在
乙醇中,然后在密封容器中将3-(5-
氯-1-戊酮-1-基)
吡啶衍生物与
乙醇氨溶液加热,以产生化合物Ia。此外,还包括上述过程中的步骤、所产生的产品和中间产物。