Heterogeneous Chitosan@Copper(II)‐Catalyzed Remote Trifluoromethylation of Aminoquinolines with the Langlois Reagent by Radical Cross‐Coupling

The first remote C−H trifluoromethylation of N‐(quinolin‐8‐yl)benzamide derivatives was accomplished with a user‐friendly chitosan‐based heterogeneous copper catalyst under mild conditions. The position‐selective C−H activation protocol afforded the corresponding coupling products in good to excellent yields with excellent reusability of the catalyst by using the low‐costing and stable Langlois reagent (CF3SO2Na) as the “CF3” source. Furthermore, control experiments suggested a single‐electron‐transfer process played a vital role in the heterogeneous C−CF3 cross‐coupling.