Water → (3AR,4R,5R,6aS)-4-((E)-4,4-Difluoro-3-oxooct-1-en-1-yl)-2-oxohexahydro-2H-cyclopenta[b]furan-5-yl

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Reaction Steps

To a solution of dimethyl (3,3-difluoro-2-oxoheptyl)phosphonate (1) (0.969 g, 3.75 mmol) in anhydrous t-butyl methyl ether (15 ml), lithium hydride (28.6 mg, 3.60 mmol) was added and the mixture was stirred for two hours at room temperature. (3aR,4R,5R,6aS)-2-oxo-5-phenylcarbonyloxyhexahydrocyclopenta[b]furan-4-carbaldehyde (10) (0.686 g, 2.50 mmol) was added thereto and the mixed solution was stirred for approximately 6 hours at 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 then dried with anhydrous magnesium sulfate. After concentration under reduced pressure, the residue was purified by silica gel column chromatography (Fuji Silysia RW-300SP: 28 g; ethyl acetate:hexane=1:2) to give (3aR,4R,5R,6aS)-4-((E)-4,4-difluoro-3-oxo-1-octenyl)-2-oxo-5-phenylcarbonyloxyhexahydrocyclopenta[b]furan (11) (48.5 mg; 0.119 mmol; yield: 4.8%).

Provenance & Evidence