反应详情

温度

50 °C

To a stirred and cooled (0° C.) suspension of N-(5-cyano-2-methylphenyl)imidazo[1,2-a]pyridine-3-carboxamide (8) (10 g, 36.2 mmol) in EtOH (225 ml) was added NH2OH (6 mL, 50% in water solution). After the addition, the reaction was stirred at room temperature for 2 hours then heated at 50° C. for another 2 hours. After cooling to room temperature, the mixture was stored in the fridge overnight. The resulting precipitate was filtered, washed with cold EtOH and dried under vacuum to afford N-(5-(N′-hydroxycarbamimidoyl)-2-methylphenyl)imidazo[1,2-a]pyridine-3-carboxamide (9) as a white solid. 1H NMR (400 MHz, d6-DMSO) δ 9.40 (dt, J=6.8, 1.2 Hz, 1H), 8.15 (s, 1H), 7.88 (d, J=2.0 Hz, 1H), 7.79 (dt, J=9.2, 1.2 Hz, 1H), 7.76 (dd, J=8.0, 1.6 Hz, 1H), 7.52 (ddd, J=9.2, 9.2, 1.2 Hz, 1H), 7.43 (d, J=8.0 Hz, 1H), 7.17 (td, J=6.8, 1.2 Hz, 1H), 2.49 (s, 3H). MS m/z 310.1 (M+1)+.

1. temperaturecooled
2. additionAfter the addition
3. stirringthe reaction was stirred at room temperature for 2 hours
4. temperatureAfter cooling to room temperature
5. customwas stored in the fridge overnight
6. filtrationThe resulting precipitate was filtered
7. washwashed with cold EtOH
8. customdried under vacuum