p-Toluenesulfonic acid monohydrate → 5-[1-(4-Methanesulfonyl-phenyl)-4-trifluoromethyl-1H-imidazol-2-yl]-2-methyl-pyridine

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A mixture of the 4,5-dihydro-imidazole of step 2 (6.2 g, 15.5 mmol) and p-toluenesulfonic acid monohydrate (1.6 g, 8.4 mmol) in toluene (550 ml) was heated to reflux for 24 hours. The reaction mixture was cooled and the solvent removed under reduced pressure. The crude mixture (8.2 g) was chromatographed on silica gel using ethyl acetate/acetone (98/2) to give pure 2-methyl-5-[1-[4-(methylsulfonyl)phenyl]-4-trifluoromethyl-1H-imidazol-2-yl]pyridine (3.9 g, 66%) as a white solid: mp (DSC) 163° C. Anal Calc'd. for C17H14N3SO2F3 : C, 53.54, H, 3.70, N, 11.02, S, 8.41. Found: C, 53.12, H, 3.56, N, 11.00, S, 8.50.

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