Ethyl Acetate → tert-Butyl ((S)-2-(3,5-difluorophenyl)-1-((S)-oxiran-2-yl)ethyl)carbamate

HRID 348801Notes

Reaction equation

HRID 348801 reaction equation
Br[CH2:2][C@@H:3]([OH:22])[C@@H:4]([NH:14][C:15](=[O:21])[O:16][C:17]([CH3:20])([CH3:19])[CH3:18])[CH2:5][C:6]1[CH:11]=[C:10]([F:12])[CH:9]=[C:8]([F:13])[CH:7]=1.C(OCC)(=O)C.[OH-].[K+]>C(O)C>[F:13][C:8]1[CH:7]=[C:6]([CH2:5][C@H:4]([NH:14][C:15](=[O:21])[O:16][C:17]([CH3:20])([CH3:19])[CH3:18])[C@H:3]2[CH2:2][O:22]2)[CH:11]=[C:10]([F:12])[CH:9]=1

Participants

5

Reactant 3

HCID 8857Ethyl AcetateHCID 14797Potassium HydroxideHCID 57487171tert-Butyl (1S,2S)-3-bromo-1-(3,5-difluorobenzyl)-2-hydroxypropylcarbamate

Product 1

HCID 9922319tert-Butyl ((S)-2-(3,5-difluorophenyl)-1-((S)-oxiran-2-yl)ethyl)carbamate

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

tert-Butyl (1S,2S)-3-bromo-1-(3,5-difluorobenzyl)-2-hydroxypropylcarbamate (IV, EXAMPLE 2) is dissolved in absolute alcohol (150 mL) and ethyl acetate (100 mL) and potassium hydroxide (2.3 g, 34.9 mmole, 1.1 eq.) in ethyl alcohol (85%, 5 mL) is added at −20 degrees C. The cold bath is then removed and the mixture stirred for 0.5 hour. The reaction is monitored by TLC (ethyl acetate/hexane, 20/80). When the reaction is complete, it is diluted with dichloromethane and extracted, washed with water, saline, dried over anhydrous sodium sulfate and the solvent removed under reduced pressure. The crude material is purified by flash chromatography on silica gel to give the title compound, TLC (ethyl acetate/hexane, 20/80) Rf=0.3; MS (MH+)=300.4.

Workup

  1. customThe cold bath is then removed
  2. additionit is diluted with dichloromethane
  3. extractionextracted
  4. washwashed with water, saline
  5. dry with materialdried over anhydrous sodium sulfate
  6. customthe solvent removed under reduced pressure
  7. customThe crude material is purified by flash chromatography on silica gel

Sources & evidence

ORD record
ord-752f4b4ce3c94d7aafd4607bc933f618
Source dataset
uspto-grants-2007_02
Patent number
US07176242B2

Reaction notes

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