反应详情

To a solution of 4-chloro-3-nitropyridine (3.0 g, 18.9 mmol) in dry ethanol as added 2,3-difluorobenzenamine (3.66 g, 28.3 mmol). The reaction mixture was refluxed for 30 min. After cooling and concentration in vacuo to give a brown solid, the crude product was taken up in water and the aqueous solution adjusted to a pH of 8-9 and the solution extracted with EtOAc (3×100 mL). The combined organics were washed with water (3×100 mL) and brine solution (1×100 mL), respectively, dried over Na2SO4, and evaporated in vacuo to give a light brown solid. The crude product was triturated with petroleum ether (3×30 mL) to afford N-(2,3-difluorophenyl)-3-nitropyridin-4-amine (3.7 g, 79% yield) as light yellow solid.

1. temperatureThe reaction mixture was refluxed for 30 min
2. temperatureAfter cooling
3. concentrationconcentration in vacuo
4. customto give a brown solid
5. extractionthe solution extracted with EtOAc (3×100 mL)
6. washThe combined organics were washed with water (3×100 mL) and brine solution (1×100 mL)
7. dry with materialrespectively, dried over Na2SO4
8. customevaporated in vacuo
9. customto give a light brown solid
10. customThe crude product was triturated with petroleum ether (3×30 mL)