反应详情

温度

0 °C

Potassium tert-butoxide (2.59 g, 23.1 mmol) was added to a solution of 2-aminopyridine (1.14 g, 12.1 mmol) in THF (30 mL) at 0° C. and the reaction mixture stirred at 0° C. for 20 min. 1,3-Difluoro-2-methyl-4-nitrobenzene (2 g, 11.6 mmol) was added as a solution in THF (10 mL) and the reaction mixture stirred at 0° C. for 30 min. The reaction mixture was diluted with water and the product extracted with EtOAc (3×40 mL). The combined organic extracts were washed with brine, dried (MgSO4) and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, eluting with 0-100% EtOAc in cyclohexane) to yield the title compound as a yellow solid (2 g, 70%). 1H NMR 400 MHz δ (CDCl3): 8.53 (1H, br s), 8.19 (1H, ddd, J=5.1, 1.9, 0.8 Hz), 8.02 (1H, dd, J=9.2, 5.7 Hz), 7.57 (1H, ddd, J=8.2, 7.3, 1.9 Hz), 6.94 (1H, dd, J=9.1, 8.2 Hz), 6.86 (1H, ddd, J=7.3, 5.1, 1.0 Hz), 6.69 (1H, dt, J=8.3, 0.9 Hz), 2.06 (3H, d, J=2.8 Hz).

1. stirringthe reaction mixture stirred at 0° C. for 30 min
2. extractionthe product extracted with EtOAc (3×40 mL)
3. washThe combined organic extracts were washed with brine
4. dry with materialdried (MgSO4)
5. concentrationconcentrated in vacuo
6. washThe resultant residue was subjected to flash chromatography (SiO2, eluting with 0-100% EtOAc in cyclohexane)