Immobilized Catalysts for Iridium-Catalyzed Allylic Amination: Rate Enhancement by Immobilization

The first immobilized catalyst for Ir-catalyzed asymmetric allylic aminations is described. The catalyst is a cationic (-allyl)Ir complex bound by cation exchange to an anionic silica gel support. Preparation of the catalyst is facile, and the supported catalyst displayed considerably enhanced activity compared with the parent homogeneous catalyst. Up to 43consecutive amination runs were possible in recycling experiments.