反应详情

To a solution of 4-chloro-5-nitro-3-((trimethylsilyl)ethynyl)pyridin-2-amine (1.98 g, 7.34 mmol) in DMF (25 mL) was added potassium fluoride on alumina (40 wt %, 2.67 g, 18.35 mmol). The suspension was stirred at ambient temperature for about 1 h. Activated charcoal (0.3 g) was added and the suspension was filtered through Celite®, washing with DMF (150 mL). The solvent was removed under reduced pressure and the crude material was purified by silica gel chromatography eluting with a gradient of 0-10% MeOH in DCM to afford 4-chloro-3-ethynyl-5-nitropyridin-2-amine (1.03 g, 71%) as a yellow solid: LC/MS (Table 1, Method n) Rt=0.59 min; MS m/z: 196 (M−H)−.

1. filtrationthe suspension was filtered through Celite®
2. washwashing with DMF (150 mL)
3. customThe solvent was removed under reduced pressure
4. customthe crude material was purified by silica gel chromatography
5. washeluting with a gradient of 0-10% MeOH in DCM