反应详情

Tetrabutylammonium tribromide (20.4 g, 41.5 mmol) was added to a solution of 3-(3,4-dichlorophenyl)-3-methylbutan-2-one (9.60 g, 41.5 mmol) in MeOH-DCM (160 mL, 1:2, v/v). After stirring 24 h, the reaction mixture was concentrated under reduced pressure and then combined with EtOAc (80 mL). The organic layer was washed with H2O (50 mL), 1N HCl (50 mL), and H2O (20 mL) successively. The organic layer was washed with brine, dried over Na2SO4, and concentrated. Purification by column chromatography afforded 1-bromo-3-(3,4-dichlorophenyl)-3-methylbutan-2-one (11.8 g, 91%). 1H NMR (400 MHz, CDCl3) δ 7.45 (d, 1H), 7.38 (d, 1H), 7.08 (d, 1H), 3.86 (s, 2H), 1.56 (s, 6H).

1. concentrationthe reaction mixture was concentrated under reduced pressure
2. washThe organic layer was washed with H2O (50 mL), 1N HCl (50 mL), and H2O (20 mL) successively
3. washThe organic layer was washed with brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated
6. customPurification by column chromatography