反应详情

温度

-6 °C

4-(1H-1,2,4-Triazol-1-yl)aniline (500 mg, 3.12 mmol) was added to a solution of 3 mL of phosphoric acid (85%) and 2 mL of nitric acid (65%) at −6° C. When the mixture reached to room temperature, it was cooled to −6° C. and sodium nitrite (216 mg, 3.12 mmol) was added during 10 min. Small piece of ice (50 g) was added into the solution. The mixture was added at 0° C. to a suspension of 2,4-pentanedione (312 mg, 3.12 mmol) and potassium acetate (20 g) in ethanol (250 mL). The solution was stirred for 15 min, and then was added to 250 mL of saturated Na2CO3 aqueous solution, extracted with dichloromethane, washed with water and brine, dried over Na2SO4, and concentrated under reduced pressure to give the title compound (600 mg, 71% yield) as a brown solid: 1H NMR (400 MHz, CDCl3): δ ppm 2.54 (3H, s), 2.63 (3H, s), 7.55 (2H, d, J=8.8 Hz), 7.74 (2H, d, J=8.8 Hz), 8.12 (1H, s), 8.54 (1H, s), 14.76 (1H, s).

1. customreached to room temperature
2. extractionextracted with dichloromethane
3. washwashed with water and brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated under reduced pressure