[CH2:1]([O:8][C:9]1[CH:10]=[C:11]([CH:16]=[C:17]([OH:20])[C:18]=1[Br:19])[C:12]([O:14][CH3:15])=[O:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:21](=O)([O-])[O-].[K+].[K+].CI>CN(C=O)C.O>[CH2:1]([O:8][C:9]1[CH:10]=[C:11]([CH:16]=[C:17]([O:20][CH3:21])[C:18]=1[Br:19])[C:12]([O:14][CH3:15])=[O:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1To a mixture of methyl 3-(benzyloxy)-4-bromo-5-hydroxybenzoate (3.69 g, 10.94 mmol) and potassium carbonate (3.03 g, 21.98 mmol) in DMF (27 mL) was added methyl iodide (0.753 mL, 12.04 mmol). The mixture was stirred overnight after which time it was diluted with water and extracted with ethyl acetate (4×). The combined extracts were washed with water (8×), brine, dried over magnesium sulfate and concentrated to provide methyl 3-(benzyloxy)-4-bromo-5-methoxybenzoate as a white solid (3.72 g). MS (M+1)=351.1; 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 7.31-7.59 (m, 7H), 5.24 (s, 2H), 3.99 (s, 3H), 3.95 (s, 3H).
読み込み中…
