C−H Bond Activation Relay (CHAR) of Proline Ester Derivatives Promoted by In Situ Triarylamine Radical Cation: Selective Synthesis of 4‐Bromopyrrole Derivatives
A C−H activation relay (CHAR) of proline esters was realized by the in situ generated tris(4-bromophenyl)amine radical cation, selectively constructing the skeleton of 4-bromopyrrole under mild reaction conditions.