Methyl 3-methyl-4-[(phenylmethyl)amino]-1-piperidinecarboxylate → Methyl 4-amino-3-methylpiperidine-1-carboxylate

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Reaction Steps

A mixture of 40 parts of methyl 3-methyl-4-[(phenylmethyl)amino]-1-piperidinecarboxylate and 160 parts of methanol was hydrogenated at normal pressure and at room temperature with 2 parts of palladium-on-charcoal catalyst 10%. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated to dry. The residue was distilled (bp. 80° C. at 0.1 mm. pressure). The distillate was further purified by gas-chromatography (at 215° C. and at 10 lbs/sq. inch), yielding 8.6 parts of methyl 4-amino-3-methyl-1-piperidinecarboxylate (interm. 27)

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