Methanol → Methyl 3-bromo-2-methoxybenzoate
Reaktionsgleichung
S(=O)(=O)(O)O.[Br:6][C:7]1[C:8]([O:16][CH3:17])=[C:9]([CH:13]=[CH:14][CH:15]=1)[C:10]([OH:12])=[O:11].[CH3:18]O>>[CH3:18][O:11][C:10](=[O:12])[C:9]1[CH:13]=[CH:14][CH:15]=[C:7]([Br:6])[C:8]=1[O:16][CH3:17]Komponenten
4
Versuchsvorschrift
5.0 mL of sulfuric acid (H2SO4) was slowly added to a solution of 5.0 g of 3-bromo-2-methoxy-benzoic acid 4 in 100 mL of methanol (MeOH). The resulting solution was heated to reflux overnight. The solution was cooled to room temperature and quenched with sodium bicarbonate to pH 7. The aqueous layer was extracted several times with ethyl acetate. The combined organic extracts were washed with brine and dried over sodium sulphate. The resulting mixture was filtered. The solvents were evaporated under reduced pressure to afford 5.3 g of 3-bromo-2-methoxy-benzoic acid methyl ester 5.