title: Preparation of Poly(ionic liquid)s-Supported Recyclable Organocatalysts for the Asymmetric Nitroaldol (Henry) Reaction.
abstract: 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.
authors.affiliation: Department of Chemistry, University of Rostock, Albert-Einstein-Straße 3a, 18059 Rostock (Germany).
authors.forename: Julia
authors.initials: J
authors.lastname: Großeheilmann
authors.affiliation: Department of Chemistry, University of Rostock, Albert-Einstein-Straße 3a, 18059 Rostock (Germany).
authors.forename: Jenny
authors.initials: J
authors.lastname: Bandomir
authors.affiliation: Department of Chemistry, University of Rostock, Albert-Einstein-Straße 3a, 18059 Rostock (Germany). udo.kragl@uni-rostock.de.
authors.forename: Udo
authors.initials: U
authors.lastname: Kragl
keywords: catalyst recycling; hydrogel; immobilization; organocatalysis; polymeric ionic liquids