反应详情

A solution of butyl 2-oxobutanoate (described in Patent; IMPERIAL CHEMICAL INDUSTRIES PLC; Publ.: EP 375457 B1 (1994 Mar. 16), Appl.: EP 1989-313521 (1989 Dec. 22), 14 g, 88.6 mmol) in dichloromethane (100 mL) was cooled to 0° C., and bromine (4 mL, 80 mmol) was added over 15 minutes. Following stirring at room temperature for 30 minutes, the reaction solution was washed with aqueous sodium bicarbonate solution, washed with brine, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure to obtain 21.8 g of the title compound as a colorless liquid (100%).

1. washthe reaction solution was washed with aqueous sodium bicarbonate solution
2. washwashed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure