反应详情

To a solution of 5-amino-1-(4-fluorophenyl)-4-[3-(2-hydroxyethyl)benzoyl]pyrazole (0.8 g, 2.5 mmol) in pyridine (10 ml) was added methanesulfonyl chloride (0.29 ml, 3.7 mmol). After 2 h, the reaction mixture was poured into 2 N hydrochloric acid (40 ml) and the product was extracted into ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by flash chromatography (elution gradient: 40-100% ethyl acetate/hexane) to give 5-amino-1-(4-fluorophenyl)-4-[3-(2-methanesulfonyloxyethyl)benzoyl]pyrazole (0.87 g).

1. extractionthe product was extracted into ethyl acetate
2. washThe organic layer was washed with brine
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash chromatography (elution gradient: 40-100% ethyl acetate/hexane)