反应详情

A mixture of 2-(4-fluorophenyl)-4-hydroxy-1-[4-(methylsulfonyl)phenyl]-4-trifluoromethyl-4,5-dihydro-1H-imidazole (Step 2) (2.8 g, 7 mmol) and p-toluenesulfonic acid monohydrate (300 mg) in toluene (200 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 (3.2 g) was purified by chromatography on silica gel using toluene/ethyl acetate (1/1) to give pure 2-(4-fluorophenyl)-1-[4-(methylsulfonyl)phenyl]-4-trifluoromethyl-1H-imidazole (1.38 g, 52%) as a white solid: mp (DSC) 205.5° C. Anal. Calc'd for C17H12N2F4SO2: C, 53.13; H, 3.15; N, 7.29; S, 8.34. Found: C, 53.18; H, 3.17; N, 7.26; S, 8.57.

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 (3.2 g) was purified by chromatography on silica gel