Preparative Organic Chemistry
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ChemInform Abstract: Chiral—Achiral Ligand Synergy: Activation of a Zirconium—BINOL Lewis Acid Complex by the Addition of 4-tert-Butylcalix[4]arene.
First published: 23 June 2010
Abstract
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ChemInform Abstract
Calix[n]arenes, e.g. CAL, are found to activate the enantioselective allylation of aldehydes, e.g. (I), catalyzed by a new Zr-BINOL complex, allowing the use of less than 2% of the catalyst. Phenols are less efficient than CAL in the reaction of aldehyde (Ia) with reactant (II).
