p-Toluenesulfonic acid → 4-(2-(4-Fluorophenyl)-1H-pyrrol-1-yl)-N-methylbenzenesulfonamide

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A mixture of 3-(5,5-dimethyl-1,3-dioxan-2-yl)-1-(4-fluorophenyl)propan-1-one (Step 4) (400 mg, 1.5 mmol), 4-[(N-methylamino)sulfonyl]aniline (Step 6) (308 mg, 1.65 mmol) and p-toluenesulfonic acid (40 mg) in toluene (80 ml) was heated to reflux for 48 hr. The reaction mixture was cooled, filtered and concentrated. The crude yellowish solid (760 mg) was chromatographed (silica gel, hexane/ethyl acetate 7/3) to give 4-[2-(4-fluorophenyl)-1H-pyrrol-1-yl]-N-methylbenzenesulfonamide (198 mg, 40%) as a white solid: mp (DSC) 174° C. Anal Calc'd. for C17H15N2FO2S 0.25 H2O: C, 60.97; H, 4.67; N, 8.37. Found: C, 60.86; H, 4.56; N, 8.01.

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