反应详情

5-(2-Chloro-6-methoxyphenyl)oxazolidin-2,4-dione (1.21 g., 5 mmoles) was suspended in 25 ml. of 1,2-dichloroethane. Triethylamine (1 drop) and then methyl isocyanate (285 mg., 0.29 ml., 5 mmoles) were added and the mixture stirred for 3 hours at room temperature, by which time solution had resulted. The reaction mixture was diluted with 50 ml. of 1,2-dichloroethane, washed with two portions of saturated sodium bicarbonate and then with brine, dried over anhydrous magnesium sulfate, filtered and concentrated to product. Recrystallization from chloroform-hexane afforded purified 5-(2-chloro-6-methoxyphenyl)-3-methylcarbamoyloxazolidin-2,4-dione [1.04 g., 70%; m.p. 124°-127° C. (dec); m/e 300/298].

1. customhad resulted
2. additionThe reaction mixture was diluted with 50 ml
3. washof 1,2-dichloroethane, washed with two portions of saturated sodium bicarbonate
4. dry with materialwith brine, dried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated to product
7. customRecrystallization from chloroform-hexane
8. customafforded
9. custompurified 5-(2-chloro-6-methoxyphenyl)-3-methylcarbamoyloxazolidin-2,4-dione [1.04 g., 70%; m.p. 124°-127° C. (dec); m/e 300/298]