Ammonia → 2,5-difluoro-4-[2-pyridazin-4-yl-4-(trifluoromethyl)phenoxy]-N-1,2,4-thiadiazol-5-ylbenzenesulfonamide

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The mixture of N-(2,4-dimethoxybenzyl)-2,4,5-trifluoro-N-1,2,4-thiadiazol-5-ylbenzenesulfonamide (Preparation 647, 44 mg, 0.10 mmol), 2-pyridazin-4-yl-4-(trifluoromethyl)phenol (Preparation 712, 34 mg, 0.10 mmol), and potassium carbonate (55 mg, 0.40 mmol) in N,N-dimethylformamide (1.0 ml) was stirred at room temperature for 24 hours. The reaction mixture was poured into aqueous 2 M hydrochloric acid solution (5.0 ml) and filtered to give a solid. The solid was dissolved in dichloromethane (1.0 ml) and trifluoroacetic acid (1.0 ml) was added to the solution. The resulting solution was stirred for 16 hours. Methanol (5.0 ml) was added to the reaction mixture and filtered off polymeric solid. The filtrate was concentrated in vacuo to give a residue. The residue was passed through a 5 g SCX™ column with 1:1 dichloromethane:methanol solution and then 1:0.75:0.25 dichloromethane:methanol:7N ammonia solution in methanol. The filtrate was concentrated in vacuo and purified by HPLC. Yield 7.3 mg, 14%.

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