反应详情

温度

23 °C

2-Bromo-3-fluorobenzonitrile (1.0 g, 5.0 mmol) and (1H-pyrazol-5-yl)boronic acid (647 mg, 4.6 mmol) were combined and dissolved in degassed DME (15 mL) then treated with NaHCO3 (1260 mg, 8.4 mmol) in water and the reaction purged with bubbling N2 for 5 minutes. The reaction was treated with Pd(PPh3)4 (288 mg, 0.2 mmol) and then purged with bubbling for 5 minutes in a sealed vessel and then heated to reflux for 2 h. The reaction was then cooled to 23° C. filtered and the solids were rinsed with EtOAc and the layers separated. The organic layers were combined, dried and concentrated under reduced pressure. Chromatography (0-30% ethyl acatate/hexanes) afforded 3-fluoro-2-(1H-pyrazol-5-yl)benzonitrile (178 mg, 19%).

1. customthe reaction purged with bubbling N2 for 5 minutes
2. custompurged
3. customwith bubbling for 5 minutes in a sealed vessel
4. temperatureheated
5. temperatureto reflux for 2 h
6. filtrationfiltered
7. washthe solids were rinsed with EtOAc
8. customthe layers separated
9. customdried
10. concentrationconcentrated under reduced pressure