3-Benzyloxycarbonylamino-3-(2-hydroxy-1-methylethyl)piperidine-1-carboxylic acid tert-butyl ester → 3-Amino-3-(2-hydroxy-1-methylethyl)piperidine-1-carboxylic acid tert-butyl ester

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To a solution of an optically-active compound of 3-benzyloxycarbonylamino-3-(2-hydroxy-1-methylethyl)piperidine-1-carboxylic acid tert-butyl ester (21.0 g) in methanol (400 ml) was added 10% palladium carbon (2.1 g), and the mixture was hydrogenated at room temperature under ordinary pressure for 90 minutes. The mixture was filtered through Celite, and the filtrate was concentrated under reduced pressure to give the titled compound (13.8 g).

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