4-(4-{(S)-1-[(S)-6-(2-Hydroxy-2-methyl-propyl)-2-oxo-6-phenyl-[1,3]oxazinan-3-yl]-ethyl}-phenyl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester → 4-(4-{(S)-1-[(S)-6-(2-Hydroxy-2-methyl-propyl)-2-oxo-6-phenyl-[1,3]oxazinan-3-yl]-ethyl}-phenyl)-piperidine-1-carboxylic acid tert-butyl ester

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A mixture of 4-(4-{(S)-1-[(S)-6-(2-hydroxy-2-methyl-propyl)-2-oxo-6-phenyl-[1,3]oxazinan-3-yl]ethyl}-phenyl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (0.34 g) and 10% palladium on carbon (60 mg) in methanol (10 mL) was shaken in hydrogen atmosphere (50 psi) for 4 h. Then, the catalyst was separated by filtration and the filtrate was concentrated to yield the title compound.

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