3-Bromo-1,1,1-trifluoro-2-propanone → 2-(4-fluorophenyl)-4-hydroxy-1-[4-(methylsulfonyl)phenyl]-4-trifluoromethyl-4,5-dihydro-1H-imidazole

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Reaction Steps

To a mixture of 4-fluoro-N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide (Step 1) (4.5 g. 15.4 mmol) and sodium bicarbonate (2.59 g, 30.8 mmol) in isopropanol (200 mL), 3-bromo-1,1,1-trifluoroacetone (3.2 mL) was added. After heating the reaction mixture at 75–80° C. for 22 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 mixture (7.2 g) was purified by chromatography (silica gel, toluene/ethyl acetate, 1/1) to give 2-(4-fluorophenyl)-4-hydroxy-1-[4-(methylsulfonyl)phenyl]-4-trifluoromethyl-4,5-dihydro-1H-imidazole (3.28 g, 53%) as a white solid: mp (DSC) 203° C. Anal. Calc'd for C17H14N2F4SO3: C, 50.75; H, 3.51; N, 6.96. Found: C, 51.16; H, 3.69; N, 6.54.

Provenance & Evidence