Lithium hydroxide, monohydrate → HCID 59514704, compound

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Reaction Steps

To a solution of dimethyl (3,3-difluoro-2-oxoheptyl)phosphonate (1) (1.816 g, 7.033 mmol) in t-butyl methyl ether (16 ml), lithium hydroxide monohydrate (0.271 g, 6.46 mmol) was added and the mixture was stirred for 2.25 hours at room temperature. A solution of methyl (Z)-7-[(1R,2R,3R,5S)-5-acetoxy-2-formyl-3-(2-tetrahydropyranyloxy)cyclopentyl]-5-heptenate (8) (1.554 g, 3.920 mmol) in t-butyl methyl ether (4.7 ml) and water (0.75 ml) were added thereto, and the mixed solution was heat refluxed for approximately 24 hours. After cooling to room temperature, water was added to the solution and the mixture 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 dried with anhydrous magnesium sulfate. After concentration under reduced pressure, the residue was purified by silica gel column chromatography (Fuji Silysia BW-300SP: 47 g, ethyl acetate:hexane =1:4), to give methyl(Z)-7-[(1R,2R,3R,5S)-5-acetoxy-2-((E)-4,4-difluoro-3-oxo-1-octenyl)-3-(2-tetrahydropyranyloxy)cyclopentyl]-5-heptenate (9) (1.787 g; 3.380 mmol; yield: 86.2%) as a pale yellow oil.

Provenance & Evidence