反应详情

温度

100 °C

A 4-neck, 22-L, round bottom flask equipped with a mechanical stirrer, thermocouple, nitrogen bubbler, and condenser was charged with 5-bromophthalide (650 g, 3.0 mol), allyltri-n-butyltin (1200 g, 3.6 mol), palladium tetrakis triphenylphosphine (100 g, 0.089 mol), lithium chloride (250 g, 5.9 mol) and toluene (8.8 L). The mixture was evacuated and flushed with nitrogen 3 times and then was stirred at 100° C. for 4 hours. After slowly cooling to ambient temperature, the mixture was filtered and concentrated. The resulting solid was purified by silica gel column chromatography (heptane:ethyl acetate, 0→40%) to provide 5-allyl-2-benzofuran-1(3H)-one.

1. customThe mixture was evacuated
2. customflushed with nitrogen 3 times
3. temperatureAfter slowly cooling to ambient temperature
4. filtrationthe mixture was filtered
5. concentrationconcentrated
6. customThe resulting solid was purified by silica gel column chromatography (heptane:ethyl acetate, 0→40%)