4-Fluorobenzenesulfonyl chloride → N-(3,5-dimethylpyridin-2-yl)-4-fluorobenzenesulfonamide

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To a stirred solution of 3,5-dimethylpyridin-2-amine (129 mg, 1.056 mmol) in pyridine (5 mL) at room temperature, was added 4-fluorobenzene-1-sulfonyl chloride (205 mg, 1.056 mmol). The reaction mixture was stirred at 20° C. for 30 minutes, then left to stand for 16 hours. Additional 4-fluorobenzene-1-sulfonyl chloride (205 mg, 1.056 mmol) was then added and the reaction stirred for an additional 4 hours. The reaction mixture was concentrated in vacuo and purified by passing through an aminopropyl (NH2) solid phase extraction (SPE) cartridge eluting with methanol, followed by a sulphonic acid (SCX) SPE cartridge eluting with methanol then 2M ammonia/methanol. Concentration of the product-containing fractions provided the title compound (84.1 mg) as a yellow oil. LCMS (2 min, formic) Rt 0.89 min, m/z (ES+) 281 (M+H).

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