p-Toluenesulfonic acid monohydrate → 1-[4-(Methylsulfonyl)phenyl]-2-(4-chlorophenyl)-4-(trifluoromethyl)-1H-imidazole

HRID 52296Notes

Reaction equation

HRID 52296 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[N:9]([C:18]3[CH:23]=[CH:22][C:21]([S:24]([CH3:27])(=[O:26])=[O:25])=[CH:20][CH:19]=3)[CH2:10][C:11](O)([C:13]([F:16])([F:15])[F:14])[N:12]=2)=[CH:4][CH:3]=1.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>C1(C)C=CC=CC=1>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[N:9]([C:18]3[CH:23]=[CH:22][C:21]([S:24]([CH3:27])(=[O:25])=[O:26])=[CH:20][CH:19]=3)[CH:10]=[C:11]([C:13]([F:16])([F:14])[F:15])[N:12]=2)=[CH:4][CH:3]=1

Participants

4

Reactant 2

HCID 521998p-Toluenesulfonic acid monohydrateHCID 105740772-(4-chlorophenyl)-4-hydroxy-1-[4-(methylsulfonyl)phenyl]-4-(trifluoromethyl)-4,5-dihydro-1H-imidazole

Product 1

HCID 105011901-[4-(Methylsulfonyl)phenyl]-2-(4-chlorophenyl)-4-(trifluoromethyl)-1H-imidazoleYield 71%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

A mixture of 2-(4-chlorophenyl)-4-hydroxy-1-[4-(methylsulfonyl)phenyl]-4-(trifluoromethyl)-4,5-dihydro-1H-imidazole from Example 1 (6.2 g, 15.4 mmol) and p-toluenesulfonic acid monohydrate (0.9 g, 4.7 mmol) in toluene (300 mL) was heated to reflux for 84 hours. The reaction mixture was cooled and the solvent removed under reduced pressure. The crude residue was redissolved in methylene chloride and washed with water, aqueous sodium bicarbonate and brine. After drying (Na2SO4), filtration and concentrating in vacuo, the crude mixture was chromatographed on silica gel using hexane/ethyl acetate (1/1) to give pure 2-(4-chlorophenyl)-1-[4-(methylsulfonyl)phenyl]-4-(trifluoromethyl)-1H-imidazole (4.21 g, 71%) as a white solid: mp (DSC) 183° C. Anal. Calc'd. for C17H12N2SO2F3Cl: C, 50.94, H, 3.02, N, 6.99. Found: C, 50.64, H, 3.03, N, 6.85.

Workup

  1. temperaturewas heated
  2. temperatureto reflux for 84 hours
  3. temperatureThe reaction mixture was cooled
  4. customthe solvent removed under reduced pressure
  5. dissolutionThe crude residue was redissolved in methylene chloride
  6. washwashed with water, aqueous sodium bicarbonate and brine
  7. customAfter drying
  8. filtration(Na2SO4), filtration
  9. concentrationconcentrating in vacuo
  10. customthe crude mixture was chromatographed on silica gel

Sources & evidence

ORD record
ord-985cea68fa4443248ad022ea2f37c30d
Source dataset
uspto-grants-1997_04
Patent number
US05616601

Reaction notes

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