Lithium hydroxide, monohydrate → methyl 7-[(1R,2R,3R,5S)-5-acetoxy-2-((E)-4,4-difluoro-3-oxo-1-octenyl)-3-(2-tetrahydropyranyloxy)cyclopentyl]heptanate

HRID 1874102Notes

Reaction equation

HRID 1874102 reaction equation
COP([CH2:7][C:8](=[O:16])[C:9]([F:15])([F:14])[CH2:10][CH2:11][CH2:12][CH3:13])(=O)OC.O.[OH-].[Li+].[C:20]([O:23][C@@H:24]1[C@H:28]([CH2:29][CH2:30][CH2:31][CH2:32][CH2:33][CH2:34][C:35]([O:37][CH3:38])=[O:36])[C@@H:27]([CH:39]=O)[C@H:26]([O:41][CH:42]2[CH2:47][CH2:46][CH2:45][CH2:44][O:43]2)[CH2:25]1)(=[O:22])[CH3:21]>O1CCOCC1.O>[C:20]([O:23][C@@H:24]1[C@H:28]([CH2:29][CH2:30][CH2:31][CH2:32][CH2:33][CH2:34][C:35]([O:37][CH3:38])=[O:36])[C@@H:27](/[CH:39]=[CH:7]/[C:8](=[O:16])[C:9]([F:14])([F:15])[CH2:10][CH2:11][CH2:12][CH3:13])[C@H:26]([O:41][CH:42]2[CH2:47][CH2:46][CH2:45][CH2:44][O:43]2)[CH2:25]1)(=[O:22])[CH3:21]

Participants

6

Reactant 3

HCID 168937Lithium hydroxide, monohydrateHCID 11118722Dimethyl (3,3-difluoro-2-oxoheptyl)phosphonateHCID 11729034methyl 7-[(1R,2R,3R,5S)-5-acetoxy-2-formyl-3-(2-tetrahydropyranyl-oxy)cyclopentyl]heptanate

Product 1

HCID 59514691methyl 7-[(1R,2R,3R,5S)-5-acetoxy-2-((E)-4,4-difluoro-3-oxo-1-octenyl)-3-(2-tetrahydropyranyloxy)cyclopentyl]heptanateYield 55.9%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 312751,4-DioxaneSolvent2×

Procedure

To a solution of dimethyl (3,3-difluoro-2-oxoheptyl)phosphonate (1) (1.052 g, 4.074 mmol) in 1,4-dioxane (16 ml), lithium hydroxide monohydrate (0.160 g, 3.81 mmol) was added and stirred for approximately 1.2 hours at room temperature. A solution of methyl 7-[(1R,2R,3R,5S)-5-acetoxy-2-formyl-3-(2-tetrahydro pyranyloxy)cyclopentyl]heptanate (2) (0.902 g, 2.26 mmol) in 1,4-dioxane (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 under reduced pressure. Ethyl acetate and water were added to the residue 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: 36 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) (0.671 g; 1.26 mmol; yield: 55.9%).

Workup

  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 under reduced pressure
  5. additionEthyl acetate and water were added to the residue
  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: 36 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)

Sources & evidence

ORD record
ord-784817479e9e4e9fb0cdd269dac62c91
Source dataset
uspto-grants-2012_11
Patent number
US08304562B2

Reaction notes

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