反应详情

温度

0 °C

A solution of 4-chloro-3-iodopyridin-2-amine (4.00 g, 15.7 mmol, Adesis) in concd H2SO4 (45 mL) was cooled to about 0° C. in an ice bath. Potassium nitrate (3.50 g, 34.6 mmol) was added in four portions over about 10 min. The resulting solution was stirred at about 0° C. for about 1 h, then at ambient temperature for about 4 h. The reaction mixture was slowly poured over crushed ice (total volume 1 L) resulting in formation of a solid that was collected by vacuum filtration and dried under vacuum to give 4-chloro-3-iodo-5-nitropyridin-2-amine (2.2 g, 47%) as a yellow solid: LC/MS (Table 1, Method c) Rt=1.48 min; MS m/z 298 (M−H)−.

1. waitat ambient temperature for about 4 h
2. additionThe reaction mixture was slowly poured
3. customover crushed ice (total volume 1 L)
4. customresulting in formation of a solid
5. filtrationthat was collected by vacuum filtration
6. customdried under vacuum