反应详情

To a suspension of N-(5-cyanamido-2-methylphenyl)imidazo[1,2-a]pyridine-3-carboxamide (68) 3.52 g (12.1 mmol) in 200 mL of EtOH was added 0.75 mL NH2OH (50 wt % in water, 12.1 mmol). The resulting mixture was stirred at room temperature overnight. The precipitate was filtered, washed with EtOH (10 mL) and air dried to give N-(5-(2-hydroxyguanidino)-2-methylphenyl)imidazo[1,2-a]pyridine-3-carboxamide (69) as a white solid, which was used directly in the next step without further purification. 1H NMR (400 MHz, d6-DMSO) δ 9.44 (s, 1H), 9.46 (dd, J=6.8, 0.8 Hz, 1H), 8.54 (s, 1H), 8.34 (s, 1H), 7.76 (dd, J=7.2, 2.2 Hz, 1H), 7.59 (s, 1H), 7.52-7.43 (m, 2H), 7.18-7.06 (m, 2H), 2.13 (s, 3H). MS m/z 325.1 (M+1)+.

1. filtrationThe precipitate was filtered
2. washwashed with EtOH (10 mL) and air
3. customdried