反应详情

温度

70 °C

Lithium 2-methylpropan-2-olate (4.17 mL, 9.18 mmol) was added within 30 minutes at ambient temperature to a solution of methyl 5-bromo-6-chloro-pyridine-2-carboxylate (CAN 1214353-79-3, 1 g, 3.99 mmol) and 2-fluoroethanol (CAN 371-62-0, 332 mg, 300 μL, 5.19 mmol) in DMF (6.67 mL). The reaction mixture was heated to 70° C. and stirred for 6 h. After cooling to ambient temperature, water (5 mL) and 2N HCl (5 mL) were added. The mixture was poured onto ice/brine (50 mL) and extracted with EtOAc (2×50 mL). The combined extracts were washed with ice/brine (50 mL), dried over Na2SO4, filtered and evaporated to dryness. The crude product was purified by flash-chromatography (50 g SiO2, heptane/0-30% EtOAc in 120 min.) to give the title compound (132 mg, 12%) as light brown solid, MS (ESI) m/e=278.0 [MH+].

1. temperatureAfter cooling to ambient temperature
2. additionThe mixture was poured onto ice/brine (50 mL)
3. extractionextracted with EtOAc (2×50 mL)
4. washThe combined extracts were washed with ice/brine (50 mL)
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. customevaporated to dryness
8. customThe crude product was purified by flash-chromatography (50 g SiO2, heptane/0-30% EtOAc in 120 min.)