反应详情

温度

0 °C

2-Bromo-3-trifluoromethylaniline (8 g, 33.33 mmol) is suspended in water (90 mL) and cooled to 0° C. 96% H2SO4 (26.7 mL, 13.7 mmol) is added and the mixture stirred for 30 minutes. NaNO2 (2.41 g, 35 mmol) is dissolved in a small quantity of water and added dropwise at 0° C. The mixture is stirred for 30 minutes then potassium iodide (9.24 g, 55.66 mmol) and iodine (9.31 g, 36.66 mmol) in water are added dropwise with cooling. The mixture is stirred until gas evolution ceases then warmed to 40° C. and allowed to cool to room temperature. The mixture is shaken with excess aqueous Na2SO3 solution and extracted with ethyl acetate. The organic extracts are evaporated and the residue purified by flash chromatography (eluent: cyclohexane) to give the title compound (Yield 10.0 g)

1. additionadded dropwise at 0° C
2. stirringThe mixture is stirred for 30 minutes
3. temperaturewith cooling
4. stirringThe mixture is stirred until gas evolution ceases
5. temperaturethen warmed to 40° C.
6. temperatureto cool to room temperature
7. extractionextracted with ethyl acetate
8. customThe organic extracts are evaporated
9. customthe residue purified by flash chromatography (eluent: cyclohexane)