Insoluble polystyrene-bound bis(oxazoline): batch and continuous-flow heterogeneous enantioselective glyoxylate–ene reaction
摘要:
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.
Insoluble polystyrene-bound bis(oxazoline): batch and continuous-flow heterogeneous enantioselective glyoxylate–ene reaction
摘要:
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.
An Insoluble Polymer-Bound Bis-Oxazoline Copper(II) Complex: A Highly Efficient Heterogeneous Catalyst for the Enantioselective Mukaiyama Aldol Reaction
polystyrene-supported bis-oxazoline 1 forms a complex with copper(II)triflate that is a highly effective catalyst for the heterogeneously catalyzed enantioselective Mukaiyama aldol reaction of silylthioketene acetals with methyl pyruvate (ca. 90 % yield, ca. 90 % ee). The catalyst can be recovered by simple filtration and reused several times without a decline in enantioselectivity.