反应详情

温度

80 °C

To a solution (4 mL) of the compound (1.57 g, 7.39 mmol) obtained in Example 30b in N,N-dimethylformamide were added ethyl 1H-pyrazole-4-carboxylate (1.3 g, 9.28 mmol) and potassium carbonate (1.5 g, 10.9 mmol), and the mixture was stirred at 80° C. overnight. The reaction mixture was allowed to cool to room temperature, water was added and the mixture was extracted with ethyl acetate. The obtained organic layer was washed with water and saturated brine and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The obtained crude product was purified by column chromatography (hexane-hexane/ethyl acetate=70/30) to give the title compound (1.51 g, 66%) as a pale-brown oil.

1. temperatureto cool to room temperature
2. extractionthe mixture was extracted with ethyl acetate
3. washThe obtained organic layer was washed with water and saturated brine
4. dry with materialdried over anhydrous sodium sulfate
5. customthe solvent was evaporated under reduced pressure
6. customThe obtained crude product
7. customwas purified by column chromatography (hexane-hexane/ethyl acetate=70/30)