反应详情

A mixture of 3-fluoro-4-methoxyaniline (56.4 g; 400 mmol) and triethylamine (56 ml; 400 mmol) in dichloromethane (400 ml) is cooled down using an ice bath. Acetic anhydride (57 ml; 600 mmol) is added dropwise and the reaction mixture is agitated for 3 hours at ambient temperature. The reaction medium is then washed successively with water, with an aqueous solution of 10% sodium bicarbonate then with an aqueous solution saturated in sodium chloride. The organic fraction is dried over sodium sulphate and concentrated under reduced pressure. The residue is recrystallized from an ethyl acetate/pentane mixture in order to produce 66.5 g (91%) of a white solid, m.p. 120° C.

1. temperatureis cooled down
2. washThe reaction medium is then washed successively with water, with an aqueous solution of 10% sodium bicarbonate
3. dry with materialThe organic fraction is dried over sodium sulphate
4. concentrationconcentrated under reduced pressure
5. customThe residue is recrystallized from an ethyl acetate/pentane mixture in order