反应详情

温度

0 °C

1H-Benzotriazole-5-carboxylic acid (1 g, 6 mmol) was dissolved, in conc. sulphuric acid (20 ml) and cooled to 0° C. on an ice bath. Nitric acid (20 ml, excess) was added drop wise to the cooled solution over a period of 20 minutes. Stirring was continued for another 15 minutes at 0° C. and then at 90° C. for 2 hours, by which time TLC (A) indicated the conversion of starting material. The solution was cooled to room temperature and poured over ice to precipitate a white solid. The solid was collected by filtration and washed with copious amounts of water until neutral to afford [21] in 48% yield. Rf (A) 0.53; δH(400 MHz; DMSO-d6) 8.77 (1H, s, BT) 9.01 (1H, s, BT) 13.75 (1H, br s, OH) 16.90 (1H, s, NH); m/z (EI−HR) 208.02288 [(M) calc. for C7H4N4O4 208.02325].

1. waitat 90° C. for 2 hours
2. temperatureThe solution was cooled to room temperature
3. additionpoured over ice
4. customto precipitate a white solid
5. filtrationThe solid was collected by filtration
6. washwashed with copious amounts of water until neutral