Hydrochloric Acid → 2,6-Dichloropyridine-3,4-diamine

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To a solution of 2,6-dichloro-3-nitropyridin-4-amine in ethanol (150 mL) was added iron powder (14.3 g, 0.255 mol), water (46 mL), and then concentrated HCl (28 mL). The reaction mixture was then stirred at 95° C. for 16 hours, cooled to room temperature, and neutralized. The precipitates were collected by filtration and dried in vacuo. The crude product was then treated with water (200 mL) and extracted with EtOAc (3×200 mL). The combined extracts were dried over anhydrous Na2SO4, filtered, and concentrated to afford 7.85 g of the title compound (86.5% yield).

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