反应详情

温度

0 °C

3-Fluoro-4-chlorophenol (1.78 g, 12.1 mmol) was dissolved in methanol (40 mL). Sodium iodide (3.63 g, 24.2 mmol) and sodium hydroxide (0.97 g, 24.2 mmol) was added, and the solution was cooled to 0° C. Aqueous sodium hypochlorite (6.0% NaOCl, 24.2 mmol) was added dropwise over 75 minutes at 0-3° C. The resulting slurry was stirred for 1 h at 0-2° C. and allowed to warm up to room temperature overnight. White precipitates were observed. The mixture was adjusted to pH 7 using 1M aqueous HCl while stirring. The aqueous layer was extracted with ether for three times and the ether layer was washed with aq sodium thiosulfate, brine, the organic layers were dried with MgSO4. The solvent was removed under reduced pressure to afford the residue which was purified by flash column chromatography on silica gel (Hexanes:Ethyl acetate 1:1 to afford the desired product (1.60 g, 64% yield). 1H NMR: 6.84 (d, 1H, J=9.9 Hz), 7.67 (d, 1H, J=8.1 Hz).

1. temperatureto warm up to room temperature overnight
2. customWhite precipitates
3. stirringwhile stirring
4. extractionThe aqueous layer was extracted with ether for three times
5. washthe ether layer was washed with aq sodium thiosulfate, brine
6. dry with materialthe organic layers were dried with MgSO4
7. customThe solvent was removed under reduced pressure
8. customto afford the residue which
9. customwas purified by flash column chromatography on silica gel (Hexanes:Ethyl acetate 1:1