反应详情

To a solution of 6-aminonicotinamide (524 mg, 3.82 mmol) in TFA (10 mL) was added KNO3 (524 mg, 5.18 mmol) at room temperature with stirring. The resulting solution was stirred at 80° C. for 18 h, cooled to room temperature, then cooled water (100 mL) was added (no precipitate was formed). The resulting acidic aqueous solution was basified to pH 9 with 40% aq NaOH. The precipitate was filtered, washed with cooled water (2×5 mL), and dried to give 160 mg (23%) of 65 as a yellow powder, mp 289°-90° C. 1H NMR (DMSO-d6), 7.430 (s, 1H), 8.078 (s, 1H), 8.285 (bs, 2H, easily exchanged with D2O), 8.840 (s, 2H).

1. stirringThe resulting solution was stirred at 80° C. for 18 h
2. customwas formed)
3. filtrationThe precipitate was filtered
4. washwashed with cooled water (2×5 mL)
5. customdried