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

Participants

Reaction Steps

To a mixture of 3-fluoro-4-methoxy-N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide from Step 1 (4.15 g, 12.9 mmol) and sodium bicarbonate (2.16 g, 25.8 mmol) in isopropanol (150 mL), 3-bromo-1,1,1-trifluoroacetone (4.8 mL, 45 mmol) was added. After heating the reaction mixture at 70–75° C. for 20 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 (7.8 g) was purified by chromatography (silica gel, toluene/ethyl acetate, 7/3) to give 2-(3-fluoro-4-methoxyphenyl)-4-hydroxy-1-[4-(methylsulfonyl)phenyl]-4-(trifluoromethyl)-4,5-dihydro-1H-imidazole (3.54 g, 64%) as a white solid: mp (DSC) 210° C. Anal. Calc'd. for C18H16N2SO4F4.0.1 PhCH3: C, 50.86; H, 3.83; N, 6.34. Found: C, 50.61; H. 3.64; N, 6.16.

Provenance & Evidence