反应详情

Phthalide-3-acetic acid (XCI, 9.6 g, 50 mmol) is dissolved in methanol (50 ml) saturated with anhydrous hydrochloric acid and the mixture is cooled to 0-5° for 18 hr. The solvent is concentrated under reduced pressure, treated with sodium bicarbonate, and extracted with methylene chloride (800 ml). The organic phase is washed with saturated aqueous sodium bicarbonate, saline, dried over magnesium sulfate, filtered and concentrated to give the title compound, mp 62-63°; NMR (CDCl3, TMS) 7.94-7.50, 5.90, 3.77 and 2.92 δ.

1. temperaturethe mixture is cooled to 0-5° for 18 hr
2. concentrationThe solvent is concentrated under reduced pressure
3. additiontreated with sodium bicarbonate
4. extractionextracted with methylene chloride (800 ml)
5. washThe organic phase is washed with saturated aqueous sodium bicarbonate, saline
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated