反应详情

温度

0 °C

Sodium hydride (60%, oily, 336 mg) was added at 0° C. to a solution of ethyl diethylphosphonoacetate (1.67 ml) in tetrahydrofuran (20 ml), which was stirred at 0° C. for 30 minutes. To this solution, a solution of 1-[4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyl]-1H-pyrazol-4-carbaldehyde (2.61 g) in tetrahydrofuran (20 ml) was added dropwise at 0° C., and the mixture was stirred at room temperature for 15 minutes. The reaction mixture was poured into water, which was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated sodium chloride solution, dried (MgSO4), and concentrated. The obtained crystals were collected by filtration, and ethyl (E)-3-[1-[4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyl]-1H-pyrazole-4-yl]propenoate (2.78 g, yield: 90%) was obtained. This was recrystallized from ethyl acetate-hexane. Melting point: 112–113° C.

1. stirringthe mixture was stirred at room temperature for 15 minutes
2. extractionwas extracted with ethyl acetate
3. washThe ethyl acetate layer was washed with saturated sodium chloride solution
4. dry with materialdried (MgSO4)
5. concentrationconcentrated
6. filtrationThe obtained crystals were collected by filtration