Pyridine → 3-cyano-4-fluoro-N-(5-fluoropyridin-2-yl)benzenesulfonamide

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3-Cyano-4-fluorobenzenesulfonyl chloride (5 g, 20 mmol), 5-fluoropyridin-2-amine (3.37 g, 30 mmol) and pyridine (4.87 mL, 60 mmol) in dichloromethane (100 mL) were stirred at room temperature for 2 hours before concentrating in vacuo. The residue was triturated in hydrochloric acid (2 N aqueous solution, 100 mL) for 16 hours. The precipitate was filtered to afford the title compound as a pale pink solid, 6.1 g.

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