Sodium Hydroxide → 3-(Benzyloxy)-4-bromo-5-methoxybenzoic acid
反応式
[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]C)=[O:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[OH-].[Na+]>CO.C1COCC1>[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]([OH:14])=[O:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1参加物
4
実験手順
To a solution of methyl 3-(benzyloxy)-4-bromo-5-methoxybenzoate (3.72 g, 10.59 mmol) in 1:1 MeOH/THF (50 mL) was added aqueous sodium hydroxide (1 M, 53.0 mL, 53.0 mmol). After 10 minutes the volatiles were removed under reduced pressure and the solution acidified to pH 1 by addition of concentrated hydrochloric acid resulting in formation of a thick white precipitate. The mixture was extracted with ethyl acetate (2×), and DCM (3×). The combined extracts were washed with brine, dried over magnesium sulfate and concentrated to provide 3-(benzyloxy)-4-bromo-5-methoxybenzoic acid as a white solid (3.41 g). MS (M−1)=335.0. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 7.21-7.49 (m, 7H), 5.16 (s, 2H), 3.91 (s, 3H).