反应详情

To a stirred solution of compound 247d (1.9 g, 9.6 mmol) in dry DMF (25 mL) was added K2CO3 (1.32 g, 9.6 mmol) at room temperature. The reaction mixture was stirred for 30 min and methyl iodide (0.77 mL, 12.4 mmol) was added. After 2 hrs at room temperature, 5% aqueous citric acid was added. The mixture was extracted with EtOAc. Organics were washed with water, dried over Na2SO4, filtered, concentrated under reduced pressure, and purified by chromatography on silica gel (petroleum ether/EtOAc) to yield compound 248d as beige solid in 50% yield. 1H NMR (CDCl3, 400 MHz) δ (ppm) 3.79 (s, 3H), 3.86 (s, 3H), 6.23 (d, J=9.03 Hz, 1H), 7.75 (d, J=9.03 Hz, 1H).

1. waitAfter 2 hrs at room temperature
2. extractionThe mixture was extracted with EtOAc
3. washOrganics were washed with water
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. custompurified by chromatography on silica gel (petroleum ether/EtOAc)