p-Toluenesulfonic acid monohydrate → 1-(4-Methanesulfonyl-phenyl)-2-thiophen-2-yl-4-trifluoromethyl-1H-imidazole

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Reaction Steps

A mixture of the 4,5-dihydro-imidazole of step 2 (0.60 g, 1.54 mmol) and p-toluenesulfonic acid monohydrate (0.12 g, 0.63 mmol) in toluene (100 ml) was heated to reflux for 4.5 hours. The reaction mixture was cooled and the solvent removed under reduced pressure. The crude mixture (1.2 g) was purified by chromatography on silica gel using ethyl acetate/hexane 50/50 to give pure 2-[1-[4-(methylsulfonyl)phenyl]-4-(trifluoromethyl)-1H-imidazol-2-yl]thiophene (0.47 g, 82%) as a white solid: mp (DSC) 182° C. Anal. Calced. for C15H11N2S2O2F3 C, 48.38, H, 2.98, N, 7.52, S, 17.22. Found: C, 48.36, H, 3.02, N, 7.42, S, 17.47.

Provenance & Evidence