Abstract
The newly developed chiral catalysts 1 and 2 show opposite enantioselectivity in Michael addition reactions of cyclic enones and malonates resulting in the production of both enantiomers of products in good chemical yield and enantiomeric excess. 27Al NMR studies showed the formation of different types of complexes for catalysts 1 and 2 and the enantioselectivity was found to be dependent on the nature of the aluminium complex formed. Scope of the reaction was extended to other Michael donors such as nitro alkanes and thiols.
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