反应详情

To a solution of 4-(4-chloro-2-pyridinoxy)benzaldehyde (330 mg, 1.41 mmol) in ethanol (10 mL) was added a solution of semicarbazide hydrochloride (213 mg, 1.84 mmol) and sodium acetate trihydrate (224 mg, 1.65 mmol) in water (5 mL). The mixture was stirred at room temperature for 30 min., and the resulting solid was collected by filtration, washed with water and dried in vacuo to yield the title compound as a white solid (400 mg, 1.36 mmol, 96%), mp: 231-233° C. 1H NMR (DMSO-d6): δ 10.22 (s, 1H), 8.22 (d, J=2.5, 1H), 7.97 (dd, J=2.5, 8.7, 1H), 7.85 (s, 1H), 7.77 (d, J=8.7, 2H), 7.15 (d, J=8.7, 2H) 7.12 (d, J=8.7, 1H), 6.47 (s, 2H).

1. filtrationthe resulting solid was collected by filtration
2. washwashed with water
3. customdried in vacuo