反应详情

The compound (5.28 g) obtained in the above (1) is dissolved in methanol (32 ml), and thereto is added 1N aqueous sodium hydroxide solution (23.4 ml), and the mixture is stirred at room temperature for three hours. The reaction mixture is diluted with water, and the pH value thereof is adjusted to pH 2 with 1N hydrochloric acid, and extracted three time with ethyl acetate. The extract is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (5.18 g).

1. extractionextracted three time with ethyl acetate
2. washThe extract is washed twice with a saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. customThe desiccant is removed by filtration
5. concentrationthe filtrate is concentrated under reduced pressure