反应详情

温度

75 °C

Add sodium hydride (1.50 g, 31 mmol, 60% suspension in mineral oil) to a suspension of 2-(1H-pyrazol-3-yl)phenol (5.0 g, 31 mmol) and 7-bromoheptanoic acid ethyl ester (7.4 g, 31 mmol) in DMF (75 mL) at room temperature under nitrogen and heat the mixture at 75° C. for 16 hours. Remove the solvent under reduced pressure, dilute the residue with ethyl acetate (300 mL), wash with water (100 mL), and dry over sodium sulfate. Remove the solvent under reduced pressure and purify the residue by flash column chromatography on silica gel, eluting with hexanes/ethyl acetate (9:1), to provide 7-[3-(2-hydroxyphenyl)pyrazol-1-yl]heptanoic acid ethyl ester (4.73 g, 48%).

1. customRemove the solvent under reduced pressure
2. additiondilute the residue with ethyl acetate (300 mL)
3. washwash with water (100 mL)
4. dry with materialdry over sodium sulfate
5. customRemove the solvent under reduced pressure
6. custompurify the residue by flash column chromatography on silica gel
7. washeluting with hexanes/ethyl acetate (9:1)