[OH-].[K+].[C:3]([O:7][C:8]([N:10]1[CH2:15][CH2:14][O:13][CH:12]([C:16]([O:18]C)=[O:17])[CH2:11]1)=[O:9])([CH3:6])([CH3:5])[CH3:4].O.C(O)(=O)CC(CC(O)=O)(C(O)=O)O>CO>[C:3]([O:7][C:8]([N:10]1[CH2:15][CH2:14][O:13][CH:12]([C:16]([OH:18])=[O:17])[CH2:11]1)=[O:9])([CH3:6])([CH3:4])[CH3:5]A 1 mol/L aqueous potassium hydroxide solution (3 mL) was added to methyl 4-(tert-butoxycarbonyl)morpholine-2-carboxylate (251 mg, 1.02 mmol) in methanol (15 mL). The mixture was stirred at room temperature for 8 hours. Subsequently, water was added to the mixture, followed by addition of a 5% aqueous citric acid solution to make the mixture acidic. The mixture was then extracted with ethyl acetate. The extract was washed with brine and was dried over magnesium sulfate. Evaporation of the solvent gave 219 mg (93%) of the desired compound as a colorless powder.
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