反应详情

To a solution of dimethyl (3,3-difluoro-2-oxoheptyl)phosphonate (1) (1.050 g, 4.066 mmol) in tetrahydrofuran (16 ml), lithium hydroxide monohydrate (0.161 g, 3.84 mmol) was added and the mixture was stirred at room temperature for approximately 1.2 hours. A solution of methyl 7-[(1R,2R,3R,5S)-5-acetoxy-2-formyl-3-(2-tetrahydropyranyloxy)cyclopentyl]heptanate (2) (0.903 g, 2.27 mmol) in tetrahydrofuran (3 ml), and water (0.57 ml) were added thereto, and the mixed solution was heat refluxed for approximately 48 hours. After cooling to room temperature, approximately half of the solvent was evaporated from the solution under reduced pressure. Ethyl acetate and water were added to the solution and the solution was stirred, let to stand and then separated into two layers. The aqueous layer was extracted twice with ethyl acetate. The organic layers were combined, sequentially washed with 3% aqueous sodium chloride and saturated aqueous sodium chloride, and then dried with anhydrous magnesium sulfate. After concentration under reduced pressure, the residue was purified by silica gel column chromatography (Fuji Silysia BW-300SP 27 g, ethyl acetate:hexane =1:4). The fractions containing impurities were re-purified by silica gel column chromatography (Fuji Silysia BW-300SP: 6 g; ethyl acetate:hexane=1:4), to give methyl 7-[(1R,2R,3R,5S)-5-acetoxy-2-((E)-4,4-difluoro-3-oxo-1-octenyl)-3-(2-tetrahydropyranyloxy)cyclopentyl]heptanate (3) (0.719 g; 1.35 mmol; yield: 59.8%).

1. temperaturethe mixed solution was heat
2. temperaturerefluxed for approximately 48 hours
3. temperatureAfter cooling to room temperature
4. customapproximately half of the solvent was evaporated from the solution under reduced pressure
5. additionEthyl acetate and water were added to the solution
6. stirringthe solution was stirred
7. customseparated into two layers
8. extractionThe aqueous layer was extracted twice with ethyl acetate
9. washsequentially washed with 3% aqueous sodium chloride and saturated aqueous sodium chloride
10. dry with materialdried with anhydrous magnesium sulfate
11. concentrationAfter concentration under reduced pressure
12. customthe residue was purified by silica gel column chromatography (Fuji Silysia BW-300SP 27 g, ethyl acetate:hexane =1:4)
13. additionThe fractions containing impurities
14. customwere re-purified by silica gel column chromatography (Fuji Silysia BW-300SP: 6 g; ethyl acetate:hexane=1:4)