反应详情

A mixture of 3-benzyloxy-1-phenyl-1H-pyrazol-4-ylacetic acid (2.47 g), methyl iodide (0.75 ml), potassium carbonate (2.21 g) and N,N-dimethylformamide (25 ml) was stirred at room temperature for 1 hr. The reaction solution was poured into water and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried (MgSO4) and concentrated. The residue was subjected to silica gel column chromatography, and 3-benzyloxy-1-phenyl-1H-pyrazol-4-ylmethyl acetate (2.55 g, yield 99%) was obtained as colorless crystals from a fraction eluted with ethyl acetate-hexane (1:3, volume ratio). The crystals were recrystallized from ethyl acetate-hexane. melting point: 74–75° C.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe ethyl acetate layer was washed with saturated brine
3. dry with materialdried (MgSO4)
4. concentrationconcentrated