反应详情

To a suspension of 5-trifluoromethyl-1H-pyrazole-4-carboxylic acid ethyl ester (13 g, 62.5 mmol) and cesium carbonate (61.1 g, 187.5 mmol) in DMF (70 mL) was added 2-iodo-propane (6.86 mL, 68.75 mmol) and the resulting mixture allowed to stir at room temperature for 16 hours. The crude reaction mixture was poured onto water (100 mL) and extracted with EtOAc (100 mL×3). The combined organics were washed with water (50 mL×2), brine (50 mL), dried over sodium sulphate, filtered and concentrated under reduced pressure to afford the title compound as an off-white solid in 65% yield, 10.2 g.

1. customThe crude reaction mixture
2. additionwas poured onto water (100 mL)
3. extractionextracted with EtOAc (100 mL×3)
4. washThe combined organics were washed with water (50 mL×2), brine (50 mL)
5. dry with materialdried over sodium sulphate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure