反应详情

The crude product obtained in step (b) was stirred with 10 ml of 90% trifluoroacetic acid at room temperature for 1 h. After concentration, the residue was dissolved in a dilute sodium hydroxide solution and extracted with ethyl acetate. The aqueous phase was acidified with hydrochloric acid, and the precipitated product was filtered off with suction and dried. Yield: 1.52 g.

1. concentrationAfter concentration
2. dissolutionthe residue was dissolved in a dilute sodium hydroxide solution
3. extractionextracted with ethyl acetate
4. filtrationthe precipitated product was filtered off with suction
5. customdried