反应详情

To a mixture of 4-chloro-N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide from Step 1 (8 g, 26 mmol) and sodium bicarbonate (4.36 g, 52 mmol) in isopropanol (240 mL), 3-bromo-1,1,1-trifluoroacetone (5.4 mL, 52 mmol) was added. After heating the reaction mixture at 75°-80° C. for 24 hours, the solvent was removed. The residue was redissolved in methylene chloride and washed with water. The organic fractions were combined, dried over sodium sulfate, filtered and concentrated in vacuo. The crude product (16.2 g) was chromatographed (silica gel, hexane/ethyl acetate, 55/45) to give pure 2-(4-chlorophenyl)-4-hydroxy-1-[4-(methylsulfonyl)phenyl]-4-(trifluoromethyl)-4,5-dihydro-1H-imidazole (6.7 g, 62%) as a white solid: Anal. Calc'd. for C17H14N2SO3ClF3 : C, 48.75, H, 3.37, N, 6.69. Found: C, 48.56, H, 3.22, N, 6.51.

1. additionwas added
2. temperatureAfter heating the reaction mixture at 75°-80° C. for 24 hours
3. customthe solvent was removed
4. dissolutionThe residue was redissolved in methylene chloride
5. washwashed with water
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe crude product (16.2 g) was chromatographed (silica gel, hexane/ethyl acetate, 55/45)