Abstract

In this paper, we disclose a conceptually different approach to obtaining both enantiomers; choice of enatiofacial selectivity by use of the enatiomerically same chiral source and different achiral ligands. Both enantiomers of the Diels-Alder adducts between e-acyl-1,3-oxazolidin-2-ones and cyclopentadiene were prepared by chiral lanthanides(III)-catalyzed reactions using the same chiral source, (R)-(+)-binaphthol. It is noted that the chiral catalysts with reverse enantiofacial selectivities could be prepared by using the same chiral source and a choice of achiral ligands. 14 refs., 3 tabs.

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