反应详情

温度

45 °C

To a solution of 2-fluoro-4-hydroxybenzaldehyde (2.16 g, 15.4 mmol) in acetic acid (70 mL) was added a solution of bromine (2.71 g, 17.0 mmol) in acetic acid (10 mL), and the mixture was stirred at 45° C. for 26 hr. The reaction mixture was concentrated under reduced pressure, brine was added to the residue, and the mixture was extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=5:95-40:60) to give the title compound (2.74 g, yield 81%) as colorless crystals.

1. concentrationThe reaction mixture was concentrated under reduced pressure, brine
2. additionwas added to the residue
3. extractionthe mixture was extracted with ethyl acetate
4. dry with materialThe extract was dried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (ethyl acetate:hexane=5:95-40:60)