反应详情

温度

100 °C

To 5 ml of 130 mg of α-(1-tert-butyl-5-isopropylpyrazol-3-yl)-4-(4,4-dimethyl-1,3-oxazolin-2-yl)styrene in ethanol was added 0.4 ml of a 3N aqueous solution of an acid at room temperature. The resulting mixture was heated under reflux for 30 minutes. To the reaction mixture was added a 5N aqueous solution of sodium hydroxide to adjust its pH to 11, followed by extraction with dichloromethane. The organic layer was washed with saturated saline, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. To a solution of the residue in 3 ml of 1,4-dioxane were added 100 mg of lithium hydroxide and the resulting mixture was heated at 100° C. for 2 hours. After the completion of the reaction, a 3N aqueous solution of hydrochloric acid was added to adjust the pH to 5, followed by extraction with ethyl acetate. The organic layer was washed with saturated saline, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue so obtained was subjected to chromatography on a silica gel column (developing solvent: 50% dichloromethane/ethyl acetate), whereby 4 mg of the title compound were obtained as a pale yellow solid.

1. temperatureThe resulting mixture was heated
2. temperatureunder reflux for 30 minutes
3. extractionfollowed by extraction with dichloromethane
4. washThe organic layer was washed with saturated saline
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. additionTo a solution of the residue in 3 ml of 1,4-dioxane were added 100 mg of lithium hydroxide
8. customAfter the completion of the reaction
9. extractionfollowed by extraction with ethyl acetate
10. washThe organic layer was washed with saturated saline
11. dry with materialdried over anhydrous magnesium sulfate
12. concentrationconcentrated under reduced pressure
13. customThe residue so obtained