反应详情

温度

80 °C

A dry 10 mL, one neck round bottom flask was charged with 5-bromo-2-chloropyridin-3-ol (0.0518 g, 0.249 mmol), cesium carbonate (0.0972 g, 0.298 mmol), a stirbar and 2 mL dry DMF. The stirring slurry was treated with 2-chloroacetonitrile (0.0709 ml, 1.12 mmol) and fitted with an inert atmosphere inlet. The reaction was heated to 80° C. using an oil bath for 3 h, and cooled. The slurry was filtered through a 0.22 μm PTFE filter, and concentrated in vacuo. The residue was purified in one injection using a YMC pack diol-120-NP column (PN DN12S05-2520 wt, 250×20 mm, spherical particle, 5 μm particle size, 120 Å pore size, flow=20 mL/min: A=hexanes; B=THF; 15% B isocratic). A fraction that eluted from 10.0 to 11.8 minutes was isolated. The solvent was removed in vacuo to afford 2-(5-bromo-2-chloropyridin-3-yloxy)acetonitrile (0.0375 g, 61.0% yield). 1H NMR (300 MHz, chloroform-d) δ ppm 4.88 (s, 2H) 7.52 (d, J=1.97 Hz, 1H) 8.25 (d, J=1.97 Hz, 1H). 13C NMR (75 MHz, chloroform-d) δ ppm 54.71 (s, 1 C) 113.51 (s, 1 C) 118.90 (s, 1 C) 125.53 (s, 1 C) 140.63 (s, 1 C) 144.40 (s, 1 C) 148.93 (s, 1 C).

1. customfitted with an inert atmosphere inlet
2. customfor 3 h
3. temperaturecooled
4. filtrationThe slurry was filtered through a 0.22 μm PTFE
5. filtrationfilter
6. concentrationconcentrated in vacuo
7. customThe residue was purified in one injection
8. washA fraction that eluted from 10.0 to 11.8 minutes
9. customwas isolated
10. customThe solvent was removed in vacuo