5-Fluoro-2-nitrophenol → (2S)-2-[(5-Fluoro-2-nitrophenoxy)methyl]oxirane

HRID 496213

Reaction equation

HRID 496213 reaction equation
[CH2:1]1[O:3][C@@H:2]1[CH2:4][OH:5].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[F:25][C:26]1[CH:27]=[CH:28][C:29]([N+:33]([O-:35])=[O:34])=[C:30](O)[CH:31]=1.CCOC(/N=N/C(OCC)=O)=O>C1COCC1>[F:25][C:26]1[CH:31]=[CH:30][C:29]([N+:33]([O-:35])=[O:34])=[C:28]([CH:27]=1)[O:5][CH2:4][C@@H:2]1[CH2:1][O:3]1

Participants

6

Reactant 4

HCID 99375-Fluoro-2-nitrophenolHCID 11776TriphenylphosphineHCID 5460455(+)-GlycidolHCID 5462977Diethyl azodicarboxylate

Product 1

HCID 28109166(2S)-2-[(5-Fluoro-2-nitrophenoxy)methyl]oxiraneYield 71%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

In a flask was added (R)-glycidol (0.994 g, 13.4 mmole) and triphenylphosphine (3.52 g, 13.4 mmole) and THF (20 ml, dried over molecular sieves), and 5-fluoro-2-nitrophenol (2.10 g, 13.4 mmole). The mixture was stirred until a homogeneous solution was obtained. The solution was cooled in an ice bath and diethylazodicarboxylate (DEAD, 2.11 ml, 13.4 mmole) was added dropwise over a few minutes. After completed addition, the flask was allowed to reach room temperature and stirred for an additional 2 hours. The solvent was removed in vaccuo and to the residue was added chloroform (5-10 ml). The precipitate (PPh3O) was removed by filtration and the solid was washed with an additional amount of chloroform (5-10 ml). The filtrate was added to a flash column (SiO2, Heptane:Ethyl acetate 4:1), and purified to give 2.02 g (71%) of the sub-title compound as a crystalline material after concentration of pure fractions.

Workup

  1. customwas obtained
  2. temperatureThe solution was cooled in an ice bath
  3. additionaddition
  4. customto reach room temperature
  5. stirringstirred for an additional 2 hours
  6. customThe solvent was removed in vaccuo and to the residue
  7. additionwas added chloroform (5-10 ml)
  8. customThe precipitate (PPh3O) was removed by filtration
  9. washthe solid was washed with an additional amount of chloroform (5-10 ml)
  10. additionThe filtrate was added to a flash column (SiO2, Heptane:Ethyl acetate 4:1)
  11. custompurified

Sources & evidence

ORD record
ord-32908fb6e3b046e68344a2ff8e213e0c
Source dataset
uspto-grants-2005_09
Patent number
US06943188B2

Linked notes

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