反应详情

252 g (3.0 mols) of sodium bicarbonate are added to a solution of 360 g (1.8 mols) of 2,4-dichloro-5-nitrothiazole in 1.5 l of acetonitrile. A mixture of 139.5 g (1.5 mols) of aniline and 1,500 ml of acetonitrile is then added dropwise at -10° C. to -15° C. in the course of about 4.5 hours and the mixture is subsequently stirred at the same temperature for a further 4 hours. It is then stirred into 15 l of ice-water and the precipitate is filtered off, washed with water and dried. To remove excess 2,4-dichloro-5-nitrothiazole, the product is stirred into 2.4 l of petroleum ether at room temperature, filtered off, washed with petroleum ether and dried. 361.7 g (94.4% of theory) of 2-anilino-4-chloro-5-nitrothiazole of melting point 186° C. to 187° C. (decomposition) are obtained.

1. additionis then added dropwise at -10° C. to -15° C. in the course of about 4.5 hours
2. filtrationthe precipitate is filtered off
3. washwashed with water
4. customdried
5. customTo remove excess 2,4-dichloro-5-nitrothiazole
6. stirringthe product is stirred into 2.4 l of petroleum ether at room temperature
7. filtrationfiltered off
8. washwashed with petroleum ether
9. customdried