Trimeric piperideins and trimeric pyrrolidine are prepared by saponification of 1-acyl-2-alkoxypiperidines or pyrrolidines of the general formula ##STR1## in which n means 2 or 3 R.sub.1 represents hydrogen or a linear or branched C.sub.1 -C.sub.4 alkyl radical and R.sub.2 represents a linear or branched C.sub.1 -C.sub.4 alkyl radical In aqueous and/or alcoholic solution in known manner in the presence of a strong acid or base and trimerizing the reaction product at a pH equal to or greater than 8. The compounds are valuable intermediates for the manufacture of alkaloids and other pharmaceutically effective substances and N-heterocycles.
三聚
吡啶和三聚
吡咯烷是通过在存在强酸或碱的情况下,用
水和/或醇溶液中以已知方法皂化一般式##STR1##中的1-酰基-2-烷氧基
哌啶或
吡咯烷制备的,其中n表示2或3,R.sub.1代表氢或线性或支链的C.sub.1-C.sub.4烷基基团,R.sub.2代表线性或支链的C.sub.1-C.sub.4烷基基团。将反应产物三聚化至pH值等于或大于8。这些化合物是制造
生物碱和其他药用有效物质以及N-
杂环化合物的有价值的中间体。