反应详情

温度

0 °C

To a solution of 6-bromo-2-nitropyridin-3-ol (1.0 g, 4.6 mmol), in anhydrous DMF (15 mL) at 0° C. was added 60% sodium hydride in mineral oil (200 mg, 5.0 mmol). The reaction mixture was stirred at 0° C. for 5 min and at room temperature for 15 min. Benzyl bromide (0.6 mL, 5.0 mmol) was added dropwise and the resulting mixture was stirred at 60° C. for 1 hour, cooled to room temperature, diluted with water and extracted with EtOAc. The organic layer was separated and washed with water and brine, dried over Na2SO4, filtered and concentrated. The residue was purified by flash chromatography (Si—PPC, Et2O:pentane, gradient 0:100 to 100:0) to give 3-Benzyloxy-6-bromo-2-nitropyridine as a yellow solid (956 mg, 67%). 1H NMR (400 MHz, CHCl3-d): δ 7.60 (d, J=8.6 Hz, 1 H); 7.41-7.35 (m, 6 H); 5.25 (s, 2 H).

1. stirringthe resulting mixture was stirred at 60° C. for 1 hour
2. temperaturecooled to room temperature
3. extractionextracted with EtOAc
4. customThe organic layer was separated
5. washwashed with water and brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated
9. customThe residue was purified by flash chromatography (Si—PPC, Et2O:pentane, gradient 0:100 to 100:0)