[CH3:1][C:2]1([CH3:26])[N:8]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[C@@H:7]([C:16]([O:18]CC2C=CC=CC=2)=[O:17])[CH2:6][CH2:5][CH2:4][O:3]1>CCO.C1COCC1.[Pd]>[C:12]([O:11][C:9]([N:8]1[C@@H:7]([C:16]([OH:18])=[O:17])[CH2:6][CH2:5][CH2:4][O:3][C:2]1([CH3:26])[CH3:1])=[O:10])([CH3:15])([CH3:13])[CH3:14]Wet 5% Pd/C (400 mg) was added to a solution of 4-benzyl 3-tert-butyl (4R)-2,2-dimethyl-1,3-oxazepane-3,4-dicarboxylate (Preparation 49, 2.5 g, 6.87 mmol) in 50% EtOH in THF (100 mL) and stirred for 4 hours at room temperature under an H2 balloon. The reaction was filtered through celite and the filtrate was concentrated under reduced pressure to afford the title compound (1.6 g, 85%).
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