反应详情

N-bromosuccinimide (1.43 g, 8.07 mol) was added to a solution of 2-(3,4-diethoxy-2-fluorobenzyl)isoindol-1,3-dione (2.52 g, 7.34 mol) in acetonitrile (30 mL) on ice. The mixture was stirred on ice for ten hours, and then at room temperature for six hours. The reaction mixture was extracted after the addition of a 5% aqueous solution of sodium thiosulfate and ethyl acetate; then the resultant organic layer was washed sequentially with 1N hydrochloric acid and a saturated aqueous solution of sodium hydrogen carbonate, and dried over anhydrous magnesium sulfate. After filtration, the solvent was distilled off and the residue was purified by silica gel column chromatography (diethyl ether, no-hexane) to give 1.12 g of the title compound (yield: 36%) as white crystals.

1. extractionThe reaction mixture was extracted
2. additionafter the addition of a 5% aqueous solution of sodium thiosulfate and ethyl acetate
3. washthen the resultant organic layer was washed sequentially with 1N hydrochloric acid
4. dry with materiala saturated aqueous solution of sodium hydrogen carbonate, and dried over anhydrous magnesium sulfate
5. filtrationAfter filtration
6. distillationthe solvent was distilled off
7. customthe residue was purified by silica gel column chromatography (diethyl ether