反应详情

To a suspension of 5-bromoisobenzofuran-1(3H)-one (5 g, 23.5 mmol) in anhydrous carbon tetrachloride (50 mL) was added N-bromosuccinimide (4.18 g, 23.5 mmol) and a catalytic amount of benzoyl peroxide. The reaction mixture was heated under reflux for 2.5 hours. After cooling, the precipitated solid was filtered off, and the filtrate was concentrated on a rotary evaporator. The residual solid was partitioned between methylene chloride and water. The organic phase was washed with brine, and concentrated. The residue was purified by flash chromatography on silica gel eluting with 20% ethyl acetate in hexanes to yield the title compound. MS (ESI) m/z 290 (M+H)+.

1. temperatureThe reaction mixture was heated
2. temperatureunder reflux for 2.5 hours
3. temperatureAfter cooling
4. filtrationthe precipitated solid was filtered off
5. concentrationthe filtrate was concentrated on a rotary evaporator
6. customThe residual solid was partitioned between methylene chloride and water
7. washThe organic phase was washed with brine
8. concentrationconcentrated
9. customThe residue was purified by flash chromatography on silica gel eluting with 20% ethyl acetate in hexanes