Direct Construction of Julolidines via Reductive Annulation of Quinolines and Conjugated Enones by a MOF-Derived Hierarchically Porous Iridium Catalyst
ZrO2-supported iridium catalyst (Ir-N@HP-mesoZrO2), featuring sufficient accessible catalytic sites even with ultralow iridium loading. Such a catalyst was successfully applied to selective and direct construction of julolidines via catalytic reductive annulation of readily available quinolines and conjugated enones, proceeding with good substrate and functional group compatibility, reusable catalyst, high step