Hydrochloric Acid → 4-[4-Chloro-2-(1H-pyrazol-4-yl)phenoxy]-3-cyano-N-1,3-thiazol-2-ylbenzenesulfonamide

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Reaction Steps

tert-Butyl 4-(5-chloro-2-hydroxyphenyl)-1H-pyrazole-1-carboxylate (Preparation 205, 624 mg, 2.12 mmol), 3-cyano-4-fluoro-N-1,3-thiazol-2-ylbenzenesulfonamide (Preparation 46, 500 mg, 1.76 mmol) and potassium carbonate (732 mg, 5.30 mmol) were stirred in dimethyl sulphoxide (10 ml) at 50° C. for 2 hours. The reaction was cooled to room temperature and the mixture poured dropwise into hydrochloric acid (2M aqueous, 100 ml). The mixture was stirred at room temperature for 18 hours. The precipitate was filtered and suspended in methanol (10 ml). The mixture was treated with hydrogen chloride (4M in dioxane, 2 ml). The mixture was then stirred at room temperature over for 60 hours. The mixture was evaporated in vacuo. The residue was dissolved in methanol (5 ml). The black solution was passed through an ISOLUTE™ SCX cartridge. The cartridge was eluted with methanol (100 ml) followed by ammonia (2M in methanol). The dark ammonia solution was evaporated in vacuo. The residue was dissolved in dichloromethane/methanol (95/5, 5 ml) and passed through a pad of silica. The solution was evaporated in vacuo. The residue was purified using a silica gel column chromatography eluting with dichloromethane:ethyl acetate (gradient 1:0 to 1:9, by volume). Concentration in vacuo afforded the title compound as a white solid. Yield 427 mg, 53%

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