(S)-4-Benzyl-2-oxazolidinone → (S)-4-Benzyl-3-(2-(4-fluorophenyl)acetyl)oxazolidin-2-one

HRID 1474077Notes

Reaction equation

HRID 1474077 reaction equation
[CH2:1]([C@H:8]1[CH2:12][O:11][C:10](=[O:13])[NH:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Li]CCCC.[F:19][C:20]1[CH:25]=[CH:24][C:23]([CH2:26][C:27](Cl)=[O:28])=[CH:22][CH:21]=1>C1COCC1>[CH2:1]([C@H:8]1[CH2:12][O:11][C:10](=[O:13])[N:9]1[C:27](=[O:28])[CH2:26][C:23]1[CH:24]=[CH:25][C:20]([F:19])=[CH:21][CH:22]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 736225(S)-4-Benzyl-2-oxazolidinoneHCID 37449884-Fluorophenylacetyl chlorideHCID 178418339Butyllithium

Product 1

HCID 15536019(S)-4-Benzyl-3-(2-(4-fluorophenyl)acetyl)oxazolidin-2-oneYield 81%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a cooled (−78° C.) solution of (S)-4-benzyloxazolidin-2-one (10 g, 58 mmol, 1.0 equiv) in 100 mL THF was added dropwise n-BuLi (40 mL, 1.6 M in hexanes, 64 mmol, 1.1 equiv). After stirring for 30 minutes, 4-fluorophenylacetyl chloride (10 g, 58 mmol, 1.0 equiv) was added dropwise. After stirring for an additional 30 minutes, the reaction mixture was allowed to warm to room temperature. The reaction was quenched with saturated aq. NH4Cl, extracted with dichloromethane, and washed with brine. The organic layer was then dried over sodium sulfate, filtered, and concentrated in vacuo. Purification by silica gel (10-20% EtOAc/hexanes) provided the title compound as a thick oil (14.7 g, 81%).

Workup

  1. stirringAfter stirring for an additional 30 minutes
  2. customThe reaction was quenched with saturated aq. NH4Cl
  3. extractionextracted with dichloromethane
  4. washwashed with brine
  5. dry with materialThe organic layer was then dried over sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customPurification by silica gel (10-20% EtOAc/hexanes)

Sources & evidence

ORD record
ord-07849dd1d86f4fcaa6ae98a5561ce5b7
Source dataset
uspto-grants-2015_04
Patent number
US09018223B2

Reaction notes

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