p-Toluenesulfonic acid monohydrate → 2-Benzo[1,3]dioxol-5-yl-1-(4-methanesulfonyl-phenyl)-4-trifluoromethyl-1H-imidazole

HRID 1352944Notes

Reaction equation

HRID 1352944 reaction equation
[CH3:1][S:2]([C:5]1[CH:10]=[CH:9][C:8]([N:11]2[CH2:15][C:14](O)([C:16]([F:19])([F:18])[F:17])[N:13]=[C:12]2[C:21]2[CH:29]=[CH:28][C:24]3[O:25][CH2:26][O:27][C:23]=3[CH:22]=2)=[CH:7][CH:6]=1)(=[O:4])=[O:3].O.C1(C)C=CC(S(O)(=O)=O)=CC=1>C1(C)C=CC=CC=1>[CH3:1][S:2]([C:5]1[CH:6]=[CH:7][C:8]([N:11]2[CH:15]=[C:14]([C:16]([F:19])([F:18])[F:17])[N:13]=[C:12]2[C:21]2[CH:29]=[CH:28][C:24]3[O:25][CH2:26][O:27][C:23]=3[CH:22]=2)=[CH:9][CH:10]=1)(=[O:4])=[O:3]

Participants

4

Reactant 2

HCID 521998p-Toluenesulfonic acid monohydrateHCID 105986165-[1-[4-(methylsulfonyl)phenyl]-4-hydroxy-4-(trifluoromethyl)-4,5-dihydro-1H-imidazol-2-yl)-1,3-benzodioxole

Product 1

HCID 107876982-Benzo[1,3]dioxol-5-yl-1-(4-methanesulfonyl-phenyl)-4-trifluoromethyl-1H-imidazoleYield 80%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

A mixture of 5-[1-[4-(methylsulfonyl)phenyl]-4-hydroxy-4-(trifluoromethyl)-4,5-dihydro-1H-imidazol-2-yl]-1,3-benzodioxole from Step 2 (1.26 g, 2.9 mmol) and p-toluenesulfonic acid monohydrate (200 mg) in toluene (50 mL) was heated to reflux for 72 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 concentration in vacuo, the crude mixture (1.34 g) was purified by chromatography on silica gel using toluene/ethyl acetate 1/1 to give pure 5-(1-(4-(methylsulfonyl)phenyl)-4-(trifluoromethyl)-1H-imidazol-2-yl]-1,3-benzodioxole (940 mg, 80%) as a white solid: mp (DSC) 165° C. Anal Calc'd. for C18H13N2SO4F3: C, 52.68; H, 3.19; No 6.83. Found: C, 53.05; H, 3.19; N, 6.65.

Workup

  1. temperaturewas heated
  2. temperatureto reflux for 72 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 and concentration in vacuo
  9. customthe crude mixture (1.34 g) was purified by chromatography on silica gel

Sources & evidence

ORD record
ord-b95842a6bb264da6b999789e4e395504
Source dataset
uspto-grants-2007_05
Patent number
US07220770B2

Reaction notes

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