反应详情

A mixture of methyl 3-[1-[4-[5-methyl-2-(2-thienyl)-4-oxazolylmethoxy]benzyl]-3-phenyl-1H-pyrazol-4-yl]propionate (633 mg), lithium hydroxide monohydrate (155 mg), tetrahydrofuran (6 ml), water (4 ml) and methanol (4 ml) was stirred at room temperature for 2 hours, and 1N hydrochloric acid (3.7 ml) was added to the mixture, which was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution, dried (MgSO4), then concentrated. The colorless crystals obtained were collected by filtration to yield 3-[1-[4-[5-methyl-2-(2-thienyl)-4-oxazolylmethoxy]benzyl]-3-phenyl-1H-pyrazol-4-yl]propionic acid (581 mg, yield: 95%). This was recrystallized from ethyl acetate-hexane. Melting point: 159–160° C.

1. extractionwas extracted with ethyl acetate
2. washThe ethyl acetate layer was washed with saturated aqueous sodium chloride solution
3. dry with materialdried (MgSO4)
4. concentrationconcentrated
5. customThe colorless crystals obtained
6. filtrationwere collected by filtration