C(OC([N:11]1[CH2:15][C@H:14]([OH:16])[CH2:13][C@H:12]1[C:17]([N:19]([CH3:21])[CH3:20])=[O:18])=O)C1C=CC=CC=1.O.[H][H]>C(O)C.[C].[Pd]>[CH3:20][N:19]([CH3:21])[C:17]([C@@H:12]1[CH2:13][C@@H:14]([OH:16])[CH2:15][NH:11]1)=[O:18]To a solution of (2S,4R)-1-benzyloxycarbonyl-2-dimethylaminocarbonyl-4-hydroxypyrrolidine (5.97 g) in ethanol (60 ml), 10% palladium-carbon (containing water 50 (1.20 g) was added, and the mixture was hydrogenated at room temperature for 3 hours under an atmospheric pressure of hydrogen. After removal of the catalyst by filtration, the filtrate was evaporated to remove the solvent to give (2S,4R)-2-dimethylaminocarbonyl-4-hydroxypyrrolidine.
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