反应详情

To a solution of 6-bromo-1H-pyrazolo[4,3-b]pyridine (200 mg, 1.01 mmol) in DMF (5 mL) was added cesium carbonate (494 mg, 1.515 mmol). The reaction solution was stirred at room temperature for 5 minutes, iodomethane (215 mg, 1.515 mmol) was added. The reaction solution was stirred for 2 h and quenched with water. Volatiles were removed and the residue partitioned between ethyl acetate and water. The organic phase was washed with brine, dried (MgSO4), filtered and concentrated to give crude product which was purified by chromatographic column to afford the desired product 6-bromo-1-methyl-1H-pyrazolo[4,3-b]pyridine. LCMS-ESI+: calc'd for C7H6BrN3: 211.98 (M+H+); Found: 212.1 (M+H+).

1. stirringThe reaction solution was stirred for 2 h
2. customquenched with water
3. customVolatiles were removed
4. customthe residue partitioned between ethyl acetate and water
5. washThe organic phase was washed with brine
6. dry with materialdried (MgSO4)
7. filtrationfiltered
8. concentrationconcentrated
9. customto give crude product which
10. customwas purified by chromatographic column