(2S,3S,5S)-N-hydroxy-1-methyl-2-[(4-phenyl-3,6-dihydropyridin-1 (2H)-yl)carbonyl]-5-(pyridin-4-yloxy)piperidine-3-carboxamide TFA salt → (2S,3S,5S)-N-hydroxy-1-methyl-2-[(4-phenylpiperidin-1-yl)carbonyl]-5-(pyridin-4-yloxy)piperidine-3-carboxamide

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A mixture of (2S,3S,5S)—N-hydroxy-1-methyl-2-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]-5-(pyridin-4-yloxy)piperidine-3-carboxamide TFA salt (4 mg, 0.00001 mol) in 1 mL of MeOH was hydrogenated in the presence of 5% Pd/BaSO4, under balloon pressure of hydrogen, for 2 h. After filtered off the catalyst, the filtration was concentrated to dry to yield the titled compound (4 mg, 100%). MS (ESI): (M+H)+=439.2.

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