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The 4-(2,3,4-trimethoxybenzylthio)piperidine used as starting material, the fumarate of which melts at 154° C., was prepared by the hydrolysis, using potassium hydroxide and ethanol, of 4-(2,3,4-trimethoxybenzylthio)-1-ethoxycarbonylpiperidine (oil), which was itself prepared by the action of ClCOOC2H5 in benzene on 4-(2,3,4-trimethoxybenzylthio)-1-methylpiperidine (m.p. of the corresponding fumarate: 130° C.), which was itself prepared by the condensation of 2,3,4-trimethoxybenzyl chloride in ethanol with the sodium salt of 1-methyl-4-mercaptopiperidine, b.p./13 : 70°-72° C.

1. custom130° C.
2. custom70°-72° C.