反应详情

Trifluoroacetic acid (5 ml) was added to 0.41 g of the t-butyl ester prepared in Example 22. The obtained mixture was stirred at room temperature for one hour and freed from the trifluoroacetic acid by vacuum distillation. The obtained residue was recrystallized from ethanol/water to give 0.06 g of the title compound as a yellow crystal.

1. distillationfreed from the trifluoroacetic acid by vacuum distillation
2. customThe obtained residue was recrystallized from ethanol/water