反应详情

Suspend 12 gm. of the carboxybenzyloxyphenylacetic acid of Step A in 50 ml. of trifluoroacetic anhydride in a pressure bottle and stir at 70° to 80° C. for 2.25 hours. Evaporate the reaction mixture to a syrup. Dissolve in 50 ml. of tetrahydrofuran and treat with sodium carbonate until pH 8. Stir for 15 minutes and acidify with 5 N HCl. Dilute with water and extract with ether. Wash the extract with water and dry over magnesium sulfate. Concentrate to dryness and recrystallize from ethyl acetate/hexane to obtain the title product.

1. customEvaporate the reaction mixture to a syrup
2. dissolutionDissolve in 50 ml
3. additionof tetrahydrofuran and treat with sodium carbonate until pH 8
4. additionDilute with water
5. extractionextract with ether
6. washWash the
7. extractionextract with water
8. dry with materialdry over magnesium sulfate
9. concentrationConcentrate to dryness
10. customrecrystallize from ethyl acetate/hexane