Supported Recyclable Metal-free Frustrated Lewis Pair Catalyst for Catalytic Hydrogenation of Substituted Pyridines to Piperidines

The construction of heterogeneous frustrated Lewis pairs (FLPs) catalysts is crucial for realizing highly efficient and recyclable pyridines catalytic hydrogenation. In this work, we prepared a recyclable heterogenous FLPs catalyst CMP-BF with conjugated microporous polymer CMP-ethynyl as the support via self-catalyzed 1,1-carboboration reaction with commercial Lewis acid B(C₆F₅)₃. The as-synthesized CMP-BF demonstrates superior heterogenous catalytic hydrogenation performance (conversion>99%), and considerable stability (84% conversion after three cycles) in recyclable hydrogenation of 2,6-phenylpyridine. This work provides insights into the fabrication and catalytic application of recyclable heterogenous FLP catalysts.