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To a 500 mL flask, 2,3,5-trichloropyridine (20.00 g, 0.110 mol), 80% hydrazine (34.30 g, 0.550 mol) and dioxane (200 mL) were added sequentially. The reaction mixture was heated to reflux for 20 hours. Then the reaction mixture was cooled down to room temperature overnight and white crystal was precipitated. The white crystal was isolated via filtration and dried to give the product (14.0 g) as a white solid in 72% yield. Melting point: 187-189° C. 1H NMR (300 MHz, DMSO-d6): 8.123 (d, 1H), 7.849 (d, 1H).

1. temperatureThe reaction mixture was heated
2. temperatureto reflux for 20 hours
3. customwhite crystal was precipitated
4. customThe white crystal was isolated via filtration
5. customdried