[C:1]([O:5][C:6]([N:8]([CH2:10][C:11]1([C:17]([O:19]C)=[O:18])[CH2:16][CH2:15][O:14][CH2:13][CH2:12]1)[CH3:9])=[O:7])([CH3:4])([CH3:3])[CH3:2].O.[OH-].[Na+]>CO>[C:1]([O:5][C:6]([N:8]([CH2:10][C:11]1([C:17]([OH:19])=[O:18])[CH2:12][CH2:13][O:14][CH2:15][CH2:16]1)[CH3:9])=[O:7])([CH3:4])([CH3:2])[CH3:3]Methyl 4-{[(tert-butoxycarbonyl)(methyl)amino]methyl}tetrahydro-2H-pyran-4-carboxylate (2.81 mmol) was dissolved in methanol (7.3 mL) and water (5.9 mL) and treated with 10 M sodium hydroxide (1.40 mL, 14.0 mmol). The solution was heated at 60° C. overnight. The reaction was cooled to room temperature, and volatiles were removed on a rotovap. The remaining solution was diluted with water and washed with ethyl acetate (2 times). The water layer was cooled with an ice bath and then acidified with a mixture of 1 N aqueous HCl (28.1 mL) and saturated sodium chloride (28.1 mL). The product was extracted with ethyl acetate (3 times), and the organic solution was dried over anhydrous sodium sulfate and filtered. Concentration of the organic solution gave the title compound (750 mg, 97% yield) which was used crude in the next step.
読み込み中…
