[CH3:1][C:2]1[CH:11]=[C:10]([CH3:12])[C:9]([C:13]2[NH:14][C:15]([C@@H:18]3[CH2:22][CH2:21][CH2:20][O:19]3)=[CH:16][N:17]=2)=[CH:8][C:3]=1[C:4]([O:6]C)=[O:5].[OH-].[Na+].CO>O>[CH3:1][C:2]1[CH:11]=[C:10]([CH3:12])[C:9]([C:13]2[NH:14][C:15]([C@@H:18]3[CH2:22][CH2:21][CH2:20][O:19]3)=[CH:16][N:17]=2)=[CH:8][C:3]=1[C:4]([OH:6])=[O:5]To a round-bottom flask was added a solution of (S)-methyl 2,4-dimethyl-5-(5-(tetrahydrofuran-2-yl)-1H-imidazol-2-yl)benzoate (compound 257.3, 400 mg, 1.33 mmol, 1.00 equiv) and sodium hydroxide (300 mg, 7.50 mmol, 5.63 equiv) in a solvent mixture of methanol and H2O (20/10 mL). The resulting solution was stirred for 2 h at 70° C. After cooling to ambient temperature, the organic solvent was removed under reduced pressure. The residual aqueous layer was washed with 2×50 mL of ethyl acetate. The pH of the aqueous layer was adjusted to 5-6 with hydrogen chloride (aq., 6 M), then extracted with 3×50 mL of ethyl acetate. The combined organic layers were dried over anhydrous sodium sulfate and concentrated in vacuo. This resulted in 340 mg (90%) of (S)-methyl 2,4-dimethyl-5-(5-(tetrahydrofuran-2-yl)-1H-imidazol-2-yl)benzoate as a yellow solid.
読み込み中…
