反应详情

To a suspension of 4-chloro-5-fluoro-pyridine-3-carbaldehyde oxime (6.8 g, 39.0 mmol) in dichloromethane (150 ml) was added carbonyl diimidazole (9.5 g, 58.5 mmol). The mixture was then heated at reflux for 30 minutes before cooling to room temperature, before being washed with saturated aqueous sodium bicarbonate followed by water. The organic layer was dried over sodium sulfate and concentrated in vacuo and the resultant residue triturated in diethyl ether/cyclohexane to afford the title compound as a pale yellow solid (4.05 g, 79%). 1H NMR (CDCl3) 8.71 (1H, d, J=0.4 Hz), 8.70 (1H, s).

1. temperatureThe mixture was then heated
2. temperatureat reflux for 30 minutes
3. washbefore being washed with saturated aqueous sodium bicarbonate
4. dry with materialThe organic layer was dried over sodium sulfate
5. concentrationconcentrated in vacuo
6. customthe resultant residue triturated in diethyl ether/cyclohexane