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ChemInform Abstract: Axially Chiral Amidinium Ions as Inducers of Enantioselectivity in Diels—Alder Reactions.
First published: 09 June 2010
Abstract
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ChemInform Abstract
Diketones of type (II) form hydrogen bonds with lipophilic amidinium ions. Thus, the Diels—Alder reaction of diene (I) with dienophile (II) in the presence of catalytic amounts of chiral amidinium salt provides the steroid skeletons (III) and (IV) with moderate enantioselectivities.
