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

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-phenyl carbonyloxyhexahydrocyclopenta[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 BW-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%).

1. stirringthe mixed solution was stirred for approximately 6 hours at room temperature
2. stirringthe mixture was stirred
3. customseparated into two layers
4. extractionThe aqueous layer was extracted twice with ethyl acetate
5. washsequentially washed with 3% aqueous sodium chloride and saturated aqueous sodium chloride
6. dry with materialdried with anhydrous magnesium sulfate
7. concentrationAfter concentration under reduced pressure
8. customthe residue was purified by silica gel column chromatography (Fuji Silysia BW-300SP: 28 g; ethyl acetate:hexane=1: 2)

ORD-Eintrag

ord-b895fe282a6746e6b0a7226a4e979fc3

Quelldatensatz

uspto-grants-2013_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08389748B2