Water → 3-(2,2-Difluoroethoxy)-1-(trifluoroacetyl)piperidin-4-one

HRID 43689Notes

Reaction equation

HRID 43689 reaction equation
O.[C:2](O)([C:4]([F:7])([F:6])[F:5])=[O:3].[F:9][CH:10]([F:30])[CH2:11][O:12][CH:13]1[C:18](OC)([O:19]C)[CH2:17][CH2:16][N:15](C(OC(C)(C)C)=O)[CH2:14]1.C(=O)(O)[O-].[Na+]>C1COCC1>[F:30][CH:10]([F:9])[CH2:11][O:12][CH:13]1[C:18](=[O:19])[CH2:17][CH2:16][N:15]([C:2](=[O:3])[C:4]([F:7])([F:6])[F:5])[CH2:14]1

Participants

6

Reactant 4

HCID 962WaterHCID 6422Trifluoroacetic acidHCID 516892Sodium BicarbonateHCID 86648630tert-Butyl 3-(2,2-difluoroethoxy)-4,4-dimethoxypiperidine-1-carboxylate

Product 1

HCID 866486323-(2,2-Difluoroethoxy)-1-(trifluoroacetyl)piperidin-4-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
70 °C

Procedure

Water (5 mL) and TFA (2 mL) were added to a solution of tert-butyl 3-(2,2-difluoroethoxy)-4,4-dimethoxypiperidine-1-carboxylate obtained in Example (121b) (1.5 g, 4.67 mmol) in THF (30 mL), and the mixture was stirred at 70° C. for one hour. Sodium bicarbonate was added to a pH of about 8, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (elution solvent: hexane/ethyl acetate=10/1, 5/1, 2/1, 1/1) to obtain 1.1 g of the title compound as a light brown oily substance (86%).

Workup

  1. extractionfollowed by extraction with ethyl acetate
  2. washThe organic layer was washed with brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationconcentrated under reduced pressure
  5. customThe resulting residue was purified by silica gel column chromatography (elution solvent: hexane/ethyl acetate=10/1, 5/1, 2/1, 1/1)

Sources & evidence

ORD record
ord-133b55fc78a64696a81b7df60a35aa62
Source dataset
uspto-grants-2013_09
Patent number
US08536197B2

Reaction notes

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