反应详情

To a solution of the compound obtained in Example 30 (6) (0.003 g) in 1,4-dioxane (0.5 ml), a 10% aqueous lithium hydroxide solution (0.5 ml) was added at −5° C. under argon atmosphere and the mixture was stirred for 2 hours. To the reaction solution was then added a 10% aqueous hydrochloric acid solution and the mixture was extracted with chloroform. The organic layer was washed with a saturated aqueous NaCl solution, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The resulting residue was separated using silica gel preparative thin-layer chromatography (chloroform:methanol=9:1) to obtain 0.001 g of the desired product.

1. extractionthe mixture was extracted with chloroform
2. washThe organic layer was washed with a saturated aqueous NaCl solution
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe resulting residue was separated