ChemInform Abstract: PYRROLIDINE- AND PIPERIDINE-ALKANOIC ACID HYDROCHLORIDES. SYNTHESIS BY HYDROGENATION OF PYRROLYL ESTER AND PYRIDINE-ALKANOIC ACID HYDROCHLORIDES

2-Pyrrolidylacetic acid and β-(2-pyrrolidyl)propionic acid hydrochloride have been prepared by hydrogenation of ethyl 2-pyrrolylacetate and diethyl 2-pyrrolylmethylenemalonate respectively, over rhodium on alumina in HCl solution, followed by acidic hydrolysis. Similarly, 1-methylnipecotic acid, 1-methylisonipecotic acid, 2- and 3-piperidine-acetic acid, and 3-piperidine-propionic acid hydrochlorides have been prepared by hydrogenation of the corresponding pyridine-alkanoic acid hydrochlorides over platinum oxide, rhodium on alumina, or palladium on carbon in water.