反应详情

N-benzyl-N-phenyl-N-methylamine (4.41 g, 0.0224 mol) was dissolved in anhydrous dichloromethane (150 mL) and 2,4,4,6-tetrabromocyclohexadiene-1-one (9.16 g, 0.0224 mol) was added in 10 equal portions over a 30 min. period. Stirring was continued at ambient temperature for 20 hours. The organic phase was successively washed with 0.5N solution of sodium hydroxide in water (100 mL), 1N solution of sodium hydroxide in water (100 mL), water (120 mL) and brine (120 mL). The organic phase was dried with magnesium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography on silica using ethyl acetate/n-heptane (1:99) as mobile phase to yield N-benzyl-N-(4-bromophenyl)-N-methylamine (3.52 g, 0.0127 mol) as a colorless oil.

1. washThe organic phase was successively washed with 0.5N solution of sodium hydroxide in water (100 mL), 1N solution of sodium hydroxide in water (100 mL), water (120 mL) and brine (120 mL)
2. dry with materialThe organic phase was dried with magnesium sulfate
3. concentrationconcentrated under reduced pressure
4. customThe residue was purified by flash chromatography on silica