Phosphorus pentachloride → 3-Chloropyridine-2-carbonitrile

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To a solution of 3-hydroxypicolinamide (2.00 g, 14.5 mmol) in phosphorus oxychloride (10 mL) at room temperature was added phosphorus pentachloride (6.00 g, 28.8 mmol). The mixture was heated at reflux for 90 min, and the solvent was removed by distillation. The residue was poured into water, the aqueous solution was neutralized by addition of sodium bicarbonate, and was extracted with ethyl acetate. The organic phase was filtered through silica gel, the filtrate was concentrated, and the residue was subjected to flash chromatography on silica gel, affording 300 mg of 3-chloro-2-cyanopyridine. 1H NMR (CDCl3) δ 7.50 (dd, 1, J=4.8, 8.4), 7.89 (dd, 1, J=1.6, 8.4), 8.63 (dd, 1, J=1.6, 4.8).

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