反应详情

温度

80 °C

A mixture of 4-(2-ethyl-5-hydroxyphenyl)-2,2,6,6-tetramethylpyran-3,5-dione (135 mg, 0.47 mmol), 3,4-difluoro-1-nitrobenzene (90 mg, 0.56 mmol), and potassium carbonate (130 mg, 0.94 mmol) in N,N-dimethylformamide (3 ml) is heated to 80° C. for 3 hours. The mixture is cooled to room temperature, poured into 2M aqueous hydrochloric acid and extracted with ethyl acetate. The organic extract is dried over anhydrous magnesium sulfate, filtered and the filtrate is evaporated under reduced pressure. The residue is purified by column chromatography on silica gel to give 4-[2-ethyl-5-(2-fluoro-4-nitrophenoxy)phenyl]-2,2,6,6-tetramethylpyran-3,5-dione.

1. temperatureThe mixture is cooled to room temperature
2. extractionextracted with ethyl acetate
3. extractionThe organic extract
4. dry with materialis dried over anhydrous magnesium sulfate
5. filtrationfiltered
6. customthe filtrate is evaporated under reduced pressure
7. customThe residue is purified by column chromatography on silica gel