反应详情

温度

2.5 °C

3-Aminocoumarin (250 mg, 1.6 mmol) was dissolved in 30 mL of 3% HCl at room temperature. After cooling to 0-5° C., the solution was added drop-wise to a solution of NaNO2 (160 mg, 2.3 mmol) and stirred for two hours. Upon addition of NaN3 (150 mg, 2.3 mmol), the mixture was stirred at 0-5° C. for two hours followed by stirring at room temperature for three and a half hours. The precipitate was filtered, washed to neutral pH with water and dried under vacuum to afford a white solid; yield (226 mg, 78%); mp: 108-112° C.; 1H-NMR (300 MHz, CDCl3): δ 7.2-7.6 (m, 5H).

1. stirringthe mixture was stirred at 0-5° C. for two hours
2. stirringby stirring at room temperature for three and a half hours
3. filtrationThe precipitate was filtered
4. washwashed to neutral pH with water
5. customdried under vacuum
6. customto afford a white solid
7. customyield (226 mg, 78%)