Abstract
Attachment of the proline-derived ligand 5 to two types of polymers, i.e. aminomethylated polystyrene resin and respectively MeO-PEG, was achieved via a succinyl linkage from the 4-hydroxy group. Both of the supported ligands ( 7 and 8) were proved to be highly active with good enantioselectivity (up to 90% ee) for the catalyzed asymmetric diethylzinc addition to aldehydes. The insoluble polymer-supported catalyst could be easily recovered and was reusable for several consecutive catalytic runs without significant loss in enantioselectivity.
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