反应详情

A mixture of methyl 3-hydroxy-1-methyl-1H-pyrazole-5-carboxylate (2.34 g, 15.0 mmol), iodomethane (3.19 g, 22.5 mmol), potassium carbonate (4.15 g, 30.0 mmol) and N,N-dimethylformamide (15 mL) was stirred at room temperature for 18 hr. The mixture was diluted with water (50 mL), and extracted with ethyl acetate (50 mL×3). The organic layer was washed with water (10 mL×2), and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=100/0→50/50) to give the title compound (2.01 g, yield 79%) as a white solid.

1. extractionextracted with ethyl acetate (50 mL×3)
2. washThe organic layer was washed with water (10 mL×2)
3. concentrationconcentrated under reduced pressure
4. customThe residue was purified by silica gel column chromatography (hexane/ethyl acetate=100/0→50/50)