反应详情

A mixture of 41 g (22.3 mmol) of ethyl o-chlorobenzimidate and 25 g (25 mmol) of triethylamine in 500 ml of methylene chloride is treated dropwise with 19.5 g (24.8 mmol) of acetyl chloride, the temperature being held at 40° C. by the use of cooling. The reaction mixture is stirred at room temperature for a further 30 minutes, and the mixture is then washed in sequence with water, 5% sodium bicarbonate solution and semi-saturated sodium chloride solution, dried over anhydrous magnesium sulfate and evaporated under reduced pressure. After distillation of the crude product at 110° C./0.16 mmHg (21.33 Pa) there is obtained ethyl N-acetyl-o-chlorobenzimidate as a colourless liquid.

1. custombeing held at 40° C. by the use
2. temperatureof cooling
3. washthe mixture is then washed in sequence with water, 5% sodium bicarbonate solution and semi-saturated sodium chloride solution
4. dry with materialdried over anhydrous magnesium sulfate
5. customevaporated under reduced pressure
6. distillationAfter distillation of the crude product at 110° C./0.16 mmHg (21.33 Pa) there