反应详情

To a solution of 3-[5-(4-trifluoromethylphenyl)-4-isoxazolyl]propionic acid (2.20 g) in methanol (50 ml) was added conc. sulfuric acid (1 ml) and the mixture was heated under reflux for 1 hr. The reaction mixture was concentrated, and iced water was poured into the residue. The precipitated crystals (1.70 g, yield 74%) of methyl 3-[5-(4-trifluoromethylphenyl)-4-isoxazolyl]propionate were collected by filtration. The crystals were recrystallized from ethyl acetate-hexane to give a colorless prism. melting point: 68–69° C.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 1 hr
3. concentrationThe reaction mixture was concentrated
4. additioniced water was poured into the residue