Process for preparing trimeric .delta.1-piperideins and trimeric 1-pyrroline

Abstract From the Canadian patent

Trimeric piperideins and trimeric pyrrolidine are prepared by saponification of 1-acyl-2-alkoxypiperidines or pyrrolidines of the general formula, II in which x means 2 or 3, R1 represents hydrogen or a linear or branched C1-C4 alkyl radical and, R2 represents a linear or branched C1-C4 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 M-heterocycles.