反应详情

温度

120 °C

A mixture of Example 52A (4.75 g, 21.0 mmol) and phenyl hydrazine (2.07 mL, 21.0 mmol) was treated with concentrated sulfuric acid (5 drops), heated to 120° C. for 15 minutes, cooled to room temperature, treated with ethanol (25 mL), treated with bubbling HCl gas for 2 minutes, and heated to reflux for 1 hour. The mixture was poured into water (30 mL) and extracted with diethyl ether. The combined extracts were washed with water and brine, dried (MgSO4), filtered, and concentrated. The concentrate was recrystallized from ethanol to provide 750 mg (12%) of the desired product.

1. temperaturecooled to room temperature
2. temperatureheated
3. temperatureto reflux for 1 hour
4. extractionextracted with diethyl ether
5. washThe combined extracts were washed with water and brine
6. dry with materialdried (MgSO4)
7. filtrationfiltered
8. concentrationconcentrated
9. customThe concentrate was recrystallized from ethanol