反应详情

温度

100 °C

A suspension of 1H-pyrazole-4-carboxylic acid ethyl ester (1.0 g), benzhydryl chloride (1.9 ml) and potassium carbonate (1.48 g) in anhydrous 1-methyl-2-pyrrolidinone (10 ml) was heated at 100° C. under nitrogen for 6 h. It was diluted with water and extracted with ethyl acetate, the organic extracts washed with water, dried over anhydrous magnesium sulfate, filtered and evaporated under reduced pressure. The residue was purified by column chromatography over silica, eluting with i-hexane/ethyl acetate (4:1) followed by i-hexane/ethyl acetate (2:1) to give the sub-title compound (2.18 g).

1. extractionextracted with ethyl acetate
2. washthe organic extracts washed with water
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltered
5. customevaporated under reduced pressure
6. customThe residue was purified by column chromatography over silica
7. washeluting with i-hexane/ethyl acetate (4:1)