反应详情

A mixture of 3-[4-(4-chlorophenyl)-2-phenyl-5-oxazolyl]-N-[4-(ethoxycarbonyl)phenyl]propionamide (0.70 g), potassium hydroxide (0.26 g), ethanol (20 ml) and tetrahydrofuran (10 ml) was stirred at room temperature for 5 hrs and further stirred at 50° C. for 3 hrs. The reaction mixture was poured into water and acidified with 1N hydrochloric acid. The mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with water and then with saturated brine, dried over anhydrous magnesium sulfate, and concentrated to give a colorless powder. Recrystallization from chloroform-ethanol gave 4-({3-[4-(4-chlorophenyl)-2-phenyl-5-oxazolyl]propanoyl}amino)benzoic acid as colorless prism crystals (0.51 g, 75%). melting point: 243–244° C.

1. stirringfurther stirred at 50° C. for 3 hrs
2. extractionThe mixture was extracted with ethyl acetate
3. washThe ethyl acetate layer was washed with water
4. dry with materialwith saturated brine, dried over anhydrous magnesium sulfate
5. concentrationconcentrated
6. customto give a colorless powder
7. customRecrystallization from chloroform-ethanol