Pyridine → N-(4-methylpyridin-3-yl)acetamide

To solution of 3-amino-4-methylpyridine (540.2 mg, 5.0 mmol, 1 equiv) in dichloromethane (20 mL) was added pyridine (0.8 mL, 10.0 mmol, 2 equiv) and acetic anhydride (0.57 mL, 6.0 mmol, 1.2 equiv). The resultant solution was stirred at room temperature for 16 h and concentrated in vacuo to provide a crude residue. The residue was diluted with dichloromethane (200 mL), and washed with saturated sodium bicarbonate aqueous solution (50 mL) and brine (50 mL). The organic layer was separated, dried over sodium sulfate, and concentrated in vacuo to yield 3-acetylamino-4-methylpyridine (400.2 mg) as yellow solid which was used without further purification.