Abstract
( R, R)-(+)-2-[Benzyl-(2-hydroxy-2-phenylethyl)amino]-1-phenylethanol 1 is used as a chiral ligand in the synthesis of an optically active lanthanum–sodium amino diol complex LS-1. This heterobimetallic catalyst is quite effective as an asymmetric catalyst for various Michael addition reactions, 1H NMR study indicates the co-ordination of enone to the central lanthanum atom in LS-1. The reaction conditions were optimized and the adducts were obtained in high yield with moderate to high enantiomeric excess under extremely mild conditions.
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