Methyl 1-benzyl-4-methyl-1,2,5,6-tetrahydropyridin-3-ylcarbamate → Methyl 1-benzyl-4-methylpiperidin-3-yl-carbamate

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Platinum oxide (1.0 g, 4.41 mmol, 0.11 equiv.) was added to a solution of methyl 1-benzyl-4-methyl-1,2,5,6-tetrahydropyridin-3-ylcarbamate (10 g, 38.46 mmol, 1.00 equiv.) in methanol (200 mL). After introducing hydrogen gas, the mixture was stirred at about 60° C. for about 16 hours and then was filtered. The resulting filtrate was concentrated to give a crude residue that was then purified by silica gel column chromatography (ethyl acetate/petroleum (1:2)) to afford the title product a yellow solid (7 g; yield=66%). LC-MS: m/z=263 (M+H)+.

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