反应详情

To a solution of 2-(N-methylanilino)ethanol (0.76 g, 5 mmol) in methylene chloride (5 mL) were added tetraethylammonium chloride (83.0 mg, 0.5 mmol) and 0.1 mL of methanol. While stirring, a solution of bromine (0.8 g, 5 mmol) in methylene chloride (5 mL) was added slowly in a period of 5 minutes. When the color of the bromine persisted, triethylamine (0.75 mL) was added dropwise. The reaction mixture was diluted by ethyl acetate, washed with saturated sodium bicarbonate and brine, dried, and concentrated under reduced pressure to give 1.31 g of crude product which contained some 2,6-dibromo derivative. Flash chromatography of the crude mixture (35% ethyl acetate/hexane) gave 0.87 g (75%) of the desired product.

1. washwashed with saturated sodium bicarbonate and brine
2. customdried
3. concentrationconcentrated under reduced pressure
4. customto give 1.31 g of crude product which