反应详情

Methylene chloride solution containing 4-ethoxy-2,3-difluorobenzoic acid (7) (52.6 mg) and 2,3,3-trifluoro-1-hydroxy-4-n-propylbicyclo[2.2.2]octane (4) (39.0 mg) was added with N,N′-dicyclohexyl carbodiimide (53.0 mg) and 4-dimethylamino pyridine (7.0 mg), and the mixture was refluxed under heating for 11 hours. The mixture was then added with water to terminate the reaction, the organic layer was extracted three times with ethyl acetate, the organic layers were combined, and the combined organic layer was washed with saturated sodium chloride solution. The organic layer was dried over anhydrous sodium sulfate, and the solvent was then vaporized off under reduced pressure to thereby obtain a crude product. The crude product was purified by silica gel column chromatography (hexane/ethyl acetate=8:2), to thereby obtain 2,3,3-trifluoro-1-(4′-ethoxy-2′,3′-difluorophenyl)carbonyloxy-4-n-propylbicyclo[2.2.2]octane (8) (yield=20.0 mg, yield ratio=28%) as a colorless clear crystal.

1. temperaturethe mixture was refluxed
2. temperatureunder heating for 11 hours
3. customto terminate
4. customthe reaction
5. extractionthe organic layer was extracted three times with ethyl acetate
6. washthe combined organic layer was washed with saturated sodium chloride solution
7. dry with materialThe organic layer was dried over anhydrous sodium sulfate