反应详情

Trifluoro-acetic acid ethyl ester (9.82 mL, 82.5 mmol) was added to a solution of 1-pyridin-2-yl-ethanone (5.00 g, 41.2 mmol) in methanol (40 mL) containing sodium methoxide (61.8 mmol). The reaction mixture was heated at reflux overnight, concentrated under reduced pressure and acidified with aqueous hydrochloric acid (10%). The aqueous solution was extracted with ethyl acetate (10×50 mL). The organic layers were collected, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by column chromatography on silica gel to give 4,4,4-trifluoro-1-pyridin-2-yl-butane-1,3-dione (7.26 g, 81%).

1. temperatureThe reaction mixture was heated
2. temperatureat reflux overnight
3. concentrationconcentrated under reduced pressure
4. extractionThe aqueous solution was extracted with ethyl acetate (10×50 mL)
5. customThe organic layers were collected
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe crude product was purified by column chromatography on silica gel