反应详情

At room temperature, 5-(5-chloro-2-methoxyphenyl)oxazolidine-2,4-dione (1.21 g., 5 mmoles) was suspended in 25 ml. of 1,2-dichloroethane. Triethylamine (505 mg., 0.7 ml., 5 mmoles) was added and the mixture stirred for 1 minute to achieve solution. Acetyl chloride (393 mg., 0.36 ml., 5 mmoles) was added and the mixture stirred for 1 hour. The reaction mixture was concentrated to 5 ml., and solids precipitated by the addition of about 25 ml. of ether. The isolated solids were distributed between chloroform and saturated sodium bicarbonate. The organic phase was separated, washed with fresh bicarbonate and then with brine, dried over anhydrous magnesium sulfate and evaporated to yield 3-acetyl-5-(5-chloro-2-methoxyphenyl)oxazolidine-2,4-dione [910 mg., 64%; m.p. 161°-164° C.; pnmr/DMSO-d6 /delta 2.5 (s, 3H), 3.9 (s, 3H), 6.0 (s, 1H), 7.4 (m, 3H)].

1. customAt room temperature
2. stirringthe mixture stirred for 1 hour
3. concentrationThe reaction mixture was concentrated to 5 ml
4. custom, and solids precipitated by the addition of about 25 ml
5. customThe organic phase was separated
6. washwashed with fresh bicarbonate
7. dry with materialwith brine, dried over anhydrous magnesium sulfate
8. customevaporated