反应详情

87 mg of the tert-butyl ester obtained in step d) were stirred at room temperature for 15 min in 2 ml of 95% strength trifluoroacetic acid. After concentrating in vacuo, the mixture was triturated with ether, and the residue was filtered off and dried. Yield: 79 mg.

1. concentrationAfter concentrating in vacuo
2. customthe mixture was triturated with ether
3. filtrationthe residue was filtered off
4. customdried