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A new class of thioamide‐substituted cinchona derivatives is reported. A convergent and practical approach was developed to insert the thioamide functional group onto the cinchonidine from readily available dithioesters. These organocatalysts were effective in asymmetric decarboxylative Mannich and protonation reactions of α‐amido‐substituted malonic acid half oxyesters (MAHOs), affording α,β‐ and...
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