反应详情

The compound (0.85 g) obtained in Example 114b was dissolved in ethanol (8 mL) and water (2 ml), and lithium hydroxide (0.42 g) was added. The reaction mixture was stirred at room temperature overnight and concentrated under reduced pressure. The residue was diluted with water and adjusted to pH 5-6 with 1N hydrochloric acid. The resulting precipitate was collected by filtration and the obtained solid was recrystallized from ethyl acetate-petroleum ether to give the title compound (0.22 g) as a colorless solid.

1. concentrationconcentrated under reduced pressure
2. additionThe residue was diluted with water
3. filtrationThe resulting precipitate was collected by filtration
4. customthe obtained solid was recrystallized from ethyl acetate-petroleum ether