反应详情

温度

70 °C

To a suspension of the ester 32 (0.058 g, 0.16 mmol) in 75% aqueous methanol (2 mL) was added one pellet of potassium hydroxide (0.1 g). The mixture was stirred at 70° C. for 1 h during which time the material dissolved. The solution was cooled to room temperature, acidified with 1N aqueous hydrochloric acid, and then extracted with 80% ethyl acetate/hexane. The combined organic layers were dried over anhydrous MgSO4, filtered, and concentrated to afford a white solid. Recrystallization from dichloromethane/hexane afforded the desired acid 33 as a white, crystalline solid (42 mg, 91%): m.p. 230°-231° C. The structure of the product was also confirmed using IR, 1H NMR and mass spectroscopy.

1. dissolutiondissolved
2. temperatureThe solution was cooled to room temperature
3. extractionextracted with 80% ethyl acetate/hexane
4. dry with materialThe combined organic layers were dried over anhydrous MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customto afford a white solid
8. customRecrystallization from dichloromethane/hexane