反应详情

Under an argon atmosphere 6-amino-5-bromo-pyridin-2-ol (23 g, 122 mmol) was dissolved in DMF (300 mL). K2CO3 (50.6 g, 366 mmol) was added followed by the addition of methyl iodide (11.4 mL, 183 mmol). The mixture was stirred for 4 h while keeping the temperature at 20-25° C. The suspension was poured onto H2O (1 L) and the aqueous phase was extracted with EtOAc (×2). The combined organic phases washed with H2O (0.5 L) and brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by flash chromatography, eluent toluene:heptane 2:1->100:0 followed by toluene:EtOAc 95:5 to afford 3-bromo-6-methoxy-pyridin-2-ylamine as a solid (3 g).

1. customat 20-25° C
2. additionThe suspension was poured onto H2O (1 L)
3. extractionthe aqueous phase was extracted with EtOAc (×2)
4. washThe combined organic phases washed with H2O (0.5 L) and brine (200 mL)
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude product was purified by flash chromatography, eluent toluene:heptane 2:1->100:0