反应详情

1-Acetyl-3-(2-ethoxycarbonylethyl)-4,6-dimethylindoline (3.3 g) was dissolved in AcOH (30 ml) and Br2 (0.93 ml) was added, which was followed by stirring for 30 min. The reaction mixture was poured into ice water and precipitated crude crystals were collected by filtration. The obtained crystals were dissolved in CHCl3 (100 ml). After washing with water, the mixture was dried over anhydrous sodium sulfate. CHCl3 was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: CHCl3/MeOH=50/1−10/1) to give 3.0 g of 1-acetyl-5-bromo-3-(2-ethoxycarbonylethyl)-4,6-dimethylindoline.

1. customprecipitated crude crystals
2. filtrationwere collected by filtration
3. dissolutionThe obtained crystals were dissolved in CHCl3 (100 ml)
4. washAfter washing with water
5. dry with materialthe mixture was dried over anhydrous sodium sulfate
6. customCHCl3 was evaporated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (eluent: CHCl3/MeOH=50/1−10/1)