反应详情

温度

100 °C

7-Chloro-1,4-dihydro-6-nitro-2H-3,1-benzoxazine-2,4-dione (6.5 g, 26.8 mmol) was suspended in glacial acetic acid (70 mL). Ammonium acetate (6.2 g, 80.6 mmol) was added, and the resulting mixture was heated to 100° C. with stirring for 3 hours. After cooling to room temperature, the brown solution was poured into distilled water (200 mL) to precipitate a yellow solid which was collected by filtration and washed well with water and ether. This material was first air dried, then dried overnight under high vacuum to provide 2-amino-4-chloro-5-nitrobenzamide (4.9 g, 23.0 mmol, 86%): 1H NMR (DMSO-d6): δ 6.92 (s, 1H), 7.49 (br s, 1H), 7.89 (br s, 2H), 8.22 (br s, 1H), 8.53 (s, 1H).

1. temperatureAfter cooling to room temperature
2. additionthe brown solution was poured
3. distillationinto distilled water (200 mL)
4. customto precipitate a yellow solid which
5. filtrationwas collected by filtration
6. washwashed well with water and ether
7. customdried
8. customdried overnight under high vacuum