反应详情

Potassium hydroxide (512 mg, 9.12 mmol) was added to a solution of the product of example 86(200 mg, 0.46 mmol) in 3-methyl-3-pentanol (4 mL) and the mixture was heated under reflux for 20 hours. The reaction mixture was then cooled to room temperature, concentrated in vacuo and the residue was partitioned between ethyl acetate (20 mL) and water (20 mL). The organic layer was separated, dried over magnesium sulfate and concentrated in vacuo. Purification of the residue by column chromatography on silica gel, eluting with dichloromethane:methanol:0.88 ammonia, 100:0 to 90:10:1, afforded the title compound as a colourless glass in 93% yield, 193 mg.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 20 hours
3. concentrationconcentrated in vacuo
4. customthe residue was partitioned between ethyl acetate (20 mL) and water (20 mL)
5. customThe organic layer was separated
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated in vacuo
8. customPurification of the residue by column chromatography on silica gel
9. washeluting with dichloromethane