反应详情

To a suspension of 7-nitro-1,3-benzothiazol-2-ylamine (1.80 g, 9.22 mmol) in acetic acid (AcOH) (20 ml) was added 48% hydrogen bromide in H2O (10 ml) with ice-cooling. Bromine (0.157 ml) was added dropwise followed by sodium nitrite (177 mg, 23.9 mmol) in H2O (1 ml). The temperature was kept at 0 to 5° C. The mixture was stirred for 2 h with ice-cooling and then was made alkaline by dropwise addition of 6N NaOH solution. The resulting precipitate was collected by filtration, washed with water and dried under vacuum to give 1.91 g of the title compound.

1. temperaturecooling
2. customwas kept at 0 to 5° C
3. temperaturecooling
4. filtrationThe resulting precipitate was collected by filtration
5. washwashed with water
6. customdried under vacuum