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In this work, we present a metal‐free coupling protocol for the regio‐ and stereoselective C3‐thioarylation of 6‐amino‐2,3,6‐trideoxy‐d‐manno‐oct‐2‐ulosonic acid (iminoKdo). The developed procedure enables the coupling of electron‐rich, electron‐deficient, and hindered arylthiols, providing a series of C3‐modified iminoKdo derivatives in moderate to good yields. Elucidation of active species through...