Preparation of Poly(ionic liquid)s‐Supported Recyclable Organocatalysts for the Asymmetric Nitroaldol (Henry) Reaction

A novel strategy for the embedding of quinine‐based organocatalysts in polymerized ionic liquids‐based hydrogels is presented. With this technique, the encapsulated organocatalyst was successfully recovered and reused for four cycles without any loss of enantioselectivity (up to 91 % ee) for the asymmetric nitroaldol (Henry) reaction. In this study, high catalyst leaching was significantly reduced (<0.01 %) by controlling the water content. After catalyst removal, evaporation of the solvent affords the product in 98 % purity without any further purification.