反应详情

To 4-amino-3-ethylbenzonitrile (2.50 g, 17.1 mmol) stirred in water (14 mL) at 0° C. was added concentrated hydrochloric acid (7.80 mL, 257 mmol) dropwise followed by a solution of sodium nitrite (1.24 g, 18.0 mmol) in water (3.43 mL) dropwise. The resultant mixture was stirred for 15 minutes and then added over 15 minutes to a solution of potassium iodide (2.98 g, 18.0 mmol) in water (6.0 mL) at 0° C. The mixture was stirred at room temperature for 2 h. The mixture was extracted with ethyl acetate (3×100 mL) and the combined organic fractions washed with brine (100 mL), dried (phase separator) and concentrated in vacuo to give the title compound as a brown solid (4.21 g, 16.4 mmol). δH (methanol-d4, 400 MHz): 8.02 (1H, d), 7.61 (1H, d), 7.24 (1H, dd), 2.80 (2H, q), 1.21 (3H, t). MS (ES): No mass ion observed.

1. extractionThe mixture was extracted with ethyl acetate (3×100 mL)
2. washthe combined organic fractions washed with brine (100 mL)
3. customdried (phase separator)
4. concentrationconcentrated in vacuo