Benzoic Acid → [(1S)-1-[(2R)-2-(2,4-difluorophenyl)-2-oxiranyl]ethyl]benzoate

HRID 1491702Notes

Reaction equation

HRID 1491702 reaction equation
[F:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[C@:9]1([C@H:12]([OH:14])[CH3:13])[CH2:11][O:10]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[C:34](O)(=[O:41])[C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1.O.C(OCC)(=O)C>[C:34]([O:14][C@H:12]([C@@:9]1([C:3]2[CH:4]=[CH:5][C:6]([F:8])=[CH:7][C:2]=2[F:1])[CH2:11][O:10]1)[CH3:13])(=[O:41])[C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1

Participants

8

Reactant 4

HCID 243Benzoic AcidHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 10536015(1R)-1-[(2R)-2-(2,4-difluorophenyl)-2-oxiranyl]ethanol

Product 1

HCID 10709605[(1S)-1-[(2R)-2-(2,4-difluorophenyl)-2-oxiranyl]ethyl]benzoateYield 78.5%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of (1R)-1-[(2R)-2-(2,4-difluorophenyl)-2-oxiranyl]ethanol (16.1 g) in tetrahydrofuran (320 ml) were added triphenylphosphine (63.3 g), benzoic acid (29.5 g) and diethyl azodicarboxylate (42.0 g) under ice-cooling. The mixture was stirred for 6 hours at room temperature under argon atmosphere. To the reaction mixture were added ethyl acetate (800 ml) and water (500 ml). The separated aqueous layer was extracted with ethyl acetate (200 ml). The combined organic layers were washed with water and a saturated saline, dried over magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography (eluent: hexane/ethyl acetate=15:1→7:1) for purification to give [(1S)-1-[(2R)-2-(2,4-difluorophenyl)-2-oxiranyl]ethyl] benzoate (19.2 g) as a colorless oily substance.

Workup

  1. temperaturecooling
  2. extractionThe separated aqueous layer was extracted with ethyl acetate (200 ml)
  3. washThe combined organic layers were washed with water
  4. dry with materiala saturated saline, dried over magnesium sulfate
  5. concentrationconcentrated
  6. customThe residue was subjected to silica gel column chromatography (eluent: hexane/ethyl acetate=15:1→7:1) for purification

Sources & evidence

ORD record
ord-ae44b8129ab74158b5526bb2a15a10e1
Source dataset
uspto-grants-1994_12
Patent number
US05371100

Reaction notes

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