3,5-Dinitrobenzoic acid → [(1S)-1-[(2R)-2-(2-fluorophenyl)-2-oxiranyl)ethyl] 3,5-dinitrobenzoate

HRID 1636679Notes

Reaction equation

HRID 1636679 reaction equation
FC1C=CC=CC=1C1([C@H](OC2CCCCO2)C)CO1.[F:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][C:22]=1[C:27]1([C@H:30]([OH:32])[CH3:31])[CH2:29][O:28]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[N+:52]([C:55]1[CH:56]=[C:57]([CH:61]=[C:62]([N+:64]([O-:66])=[O:65])[CH:63]=1)[C:58](O)=[O:59])([O-:54])=[O:53].N(C(OCC)=O)=NC(OCC)=O.C(OC(C)C)(C)C>O1CCCC1.O.C(OCC)(=O)C>[N+:52]([C:55]1[CH:56]=[C:57]([CH:61]=[C:62]([N+:64]([O-:66])=[O:65])[CH:63]=1)[C:58]([O:32][C@H:30]([C@@:27]1([C:22]2[CH:23]=[CH:24][CH:25]=[CH:26][C:21]=2[F:20])[CH2:29][O:28]1)[CH3:31])=[O:59])([O-:54])=[O:53]

Participants

10

Reactant 6

HCID 74333,5-Dinitrobenzoic acidHCID 7914Diisopropyl EtherHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 538608792-(2-fluorophenyl)-2-[(1R)-1-(3,4,5,6-tetrahydro-2H-pyran-2-yl)oxyethyl]oxiraneHCID 86749723(1R)-1-[2-(2-fluorophenyl)-2-oxiranyl]ethanol

Product 1

HCID 86749722[(1S)-1-[(2R)-2-(2-fluorophenyl)-2-oxiranyl)ethyl] 3,5-dinitrobenzoate

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

2-(2-Fluorophenyl)-2-[(1R)-1-(3,4,5,6-tetrahydro-2H-pyran-2-yl)oxyethyl]oxirane (synthesized by the method described in EP0548553A) was converted into (1R)-1-[2-(2-fluorophenyl)-2-oxiranyl]ethanol by the method described in Reference Example 1. To an ice-cooled solution of this compound (34.77 g) in tetrahydrofuran (600 ml) were added triphenylphosphine (127.21 g), 3,5-dinitrobenzoic acid (102.88 g) and diethyl azodicarboxylate (84.47 g). The mixture was stirred at room temperature for 7 hours under an argon atmosphere, and then ethyl acetate (600 ml), diisopropyl ether (100 ml) and water (800 ml) were added. The separated aqueous layer was extracted with ethyl acetate (600 ml, 400 ml). The organic layers were combined, washed with water and a saturated aqueous solution of sodium chloride successively, dried over anhydrous magnesium sulfate and concentrated. The residue was purified by silica gel chromatography (eluent:hexane/ethyl acetate=5/1) and recrystallized from ethyl acetate to give [(1S)-1-[(2R)-2-(2-fluorophenyl)-2-oxiranyl]ethyl] 3,5-dinitrobenzoate (23.15 g) as colorless needles.

Workup

  1. extractionThe separated aqueous layer was extracted with ethyl acetate (600 ml, 400 ml)
  2. washwashed with water
  3. dry with materiala saturated aqueous solution of sodium chloride successively, dried over anhydrous magnesium sulfate
  4. concentrationconcentrated
  5. customThe residue was purified by silica gel chromatography (eluent:hexane/ethyl acetate=5/1)
  6. customrecrystallized from ethyl acetate

Sources & evidence

ORD record
ord-1ea5eeff174844d28d0bb82641d552d4
Source dataset
uspto-grants-2000_03
Patent number
US06034248

Reaction notes

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