The use of a new, insoluble polymer-bound bis(oxazoline) ligand (IPB-box) for the copper-catalyzed heterogeneous enantioselective glyoxylate-ene reaction is described. Good activity and ee values in the range 85-95% have been obtained during five to seven recycles, either in batch mode or under flow conditions, demonstrating also the recovery and reuse of the whole catalytically active copper complex. (C) 2004 Elsevier Ltd. All rights reserved.
Recyclable copper catalysts in the enantioselective glyoxylate-ene reaction catalyzed by chiral fluorous-tagged bis(oxazolines)
Chiral fluorous bis(oxazoline)/copper complexes have been applied to the asymmetric glyoxylate-ene reaction, giving moderate to high enantioselectivities. An efficient separation of the copper catalyst using a solid/liquid separation or the FRPSG concept, and its reuse was achieved. (c) 2007 Elsevier Ltd. All rights reserved.