3-Bromo-1,1,1-trifluoro-2-propanone → 3-methyl-6-[4-hydroxy-1-[4-(methylsulfonyl)phenyl]-4-(trifluoromethyl)-4,5-dihydro-1H-imidazol-2-yl]pyridine

Participants

Reaction Steps

To a mixture of the amidine of step 1 (10 mmol and sodium bicarbonate (20 mmol) in isopropanol (150 ml), 3-bromo-1,1,1-trifluoroacetone (15 mmol) is added. After heating at 80°-85° C. for 24 hours, the reaction mixture is cooled and filtered. The residue is washed with methylene chloride and the combined organic fractions are dried over sodium sulfate, filtered and concentrated. The crude mixture is chromatographed on silica gel using mixtures of ethyl acetate, isopropanol and ammonium hydroxide as eluants to give the desired 4,5-dihydro-imidazole

Provenance & Evidence