Tolperisone hydrochloride CAS NO.3644-61-9

To 1-(4-methylphenyl)-3-(1-piperidinyl)-1-propanol in chloroform was added an excess of thionyl chloride and the reaction mixture refluxed until completed. It was then taken to dryness under reduced pressure and the residue crystallized by dissolving in hot alcohol and diluting with ethyl acetate. An aqueous solution of the obtained N-[3-chloro-3-(p-tolyl)propyl]piperidine hydrochloride was hydrogenated at 3 atmospheres in the presence of buffered palladium-on-charcoal catalyst. 1-Piperidino-2-methyl-3-(p-tolyl)-3-propanone was purified by distilling the base (boiling point 106-107°C/1 mm) and reconverting to the hydrochloride, melting point 216-217°C.

To 1-(4-methylphenyl)-3-(1-piperidinyl)-1-propanol in chloroform was added an excess of thionyl chloride and the reaction mixture refluxed until completed. It was then taken to dryness under reduced pressure and the residue crystallized by dissolving in hot alcohol and diluting with ethyl acetate. An aqueous solution of the obtained N-[3-chloro-3-(p-tolyl)propyl]piperidine hydrochloride was hydrogenated at 3 atmospheres in the presence of buffered palladium-on-charcoal catalyst. 1-Piperidino-2-methyl-3-(p-tolyl)-3-propanone was purified by distilling the base (boiling point 106-107°C/1 mm) and reconverting to the hydrochloride, melting point 216-217°C.