反应详情

Methyl 4-methyl-1H-pyrazole-5-carboxylate (0.5 g) and cesium carbonate (1.16 g) were dissolved in acetonitrile (10 ml). Methyl iodide (0.25 ml) was added and the mixture stirred at RT for 16 h. The reaction mixture was diluted with water (20 ml) and DCM (20 ml) and separated using a hydrophobic frit. The aqueous layer was extracted with DCM (2×20 ml) using a hydrophobic frit. The solvent was removed in vacuo and the residue was purified by flash chromatography eluting with a gradient of 0-100% ethyl acetate in cyclohexane to give the title compound (0.172 g) as a colourless oil.

1. customseparated
2. extractionThe aqueous layer was extracted with DCM (2×20 ml)
3. customThe solvent was removed in vacuo
4. customthe residue was purified by flash chromatography
5. washeluting with a gradient of 0-100% ethyl acetate in cyclohexane