反应详情

温度

110 °C

Potassium carbonate (16.75 g, 128.1 mmol) was added to a solution of 2,5-difluoropyridine (4.91 g, 42.7 mmol) and 2,4-dimethoxybenzylamine (6.85 g, 42.7 mmol) in DMSO (30 mL). The mixture was heated to 110° C. for 16 hours, cooled to room temperature and poured into water (100 mL) and ethyl acetate (100 mL). The organic layer was separated and the aqueous layer was extracted with two further portions of ethyl acetate (25 mL). The combined organic extracts were washed with brine (50 mL), dried over MgSO4 and concentrated in vacuo. The residue was purified using silica gel column chromatography eluting with 10 to 30% ethyl acetate in heptanes to afford the title compound as a white solid (2.43 g, 22%).

1. temperaturecooled to room temperature
2. customThe organic layer was separated
3. extractionthe aqueous layer was extracted with two further portions of ethyl acetate (25 mL)
4. washThe combined organic extracts were washed with brine (50 mL)
5. dry with materialdried over MgSO4
6. concentrationconcentrated in vacuo
7. customThe residue was purified
8. washeluting with 10 to 30% ethyl acetate in heptanes