反应详情

温度

110 °C

Anhydrous sodium acetate (139.3 mmol, 11.4 g) was added to a solution of the title compound of Example 14, Step A (3.24 mmol, 1.6 g) in acetic anhydride (70 mL) and heated for 3 hours at 110° C. After cooling, the reaction mixture was poured into water (100 mL) and stirred for 1 hour. The aqueous solution was extracted with ether (2×100 mL), washed with 3% aqueous KOH (2×20 mL) and water (2×20 mL). The washed ether layer was collected, dried, filtered and the filtrate was evaporated to a brown residue, which was purified by silica gel chromatography (eluent:hexanes) to obtain the desired product, 5-fluoro-3-methyl benzofuran (59%, 1.77 mg).

1. temperatureAfter cooling
2. extractionThe aqueous solution was extracted with ether (2×100 mL)
3. washwashed with 3% aqueous KOH (2×20 mL) and water (2×20 mL)
4. customThe washed ether layer was collected
5. customdried
6. filtrationfiltered
7. customthe filtrate was evaporated to a brown residue, which
8. customwas purified by silica gel chromatography (eluent:hexanes)