反应详情

温度

40 °C

A mixture of 2-acetylamino-4-hydroxymethylthiazole (7.0 g) and N-chlorosuccinimide (6.5 g) in acetic acid ml) was heated at 40° C. for 3.5 hours with stirring. The reaction mixture was concentrated under reduced pressure and the residue was added the aqueous sodium bicarbonate. The mixture was extracted with a mixture of ethyl acetate and tetrahydrofuran (1:1), washed with water and dried over magnesium sulfate. The solvent was concentrated under reduced pressure and the residue was triturated with isopropyl ether. The precipitates were collected by filtration, washed with isopropyl ether and dried in vacuo to give 2-acetylamino-5-chloro-4-hydroxymethylthiazole (73 g, yield: 78.5%).

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. additionthe residue was added the aqueous sodium bicarbonate
3. extractionThe mixture was extracted with a mixture of ethyl acetate and tetrahydrofuran (1:1)
4. washwashed with water
5. dry with materialdried over magnesium sulfate
6. concentrationThe solvent was concentrated under reduced pressure
7. customthe residue was triturated with isopropyl ether
8. filtrationThe precipitates were collected by filtration
9. washwashed with isopropyl ether
10. customdried in vacuo