Synthesis of Bicyclic Ethers by a Gold/Palladium/Gold-Catalyzed Cyclization/Cross Coupling Sequence
作者:Birgit Gockel、Norbert Krause
DOI:10.1002/ejoc.200901010
日期:2010.1
The stereoselective gold-catalyzed 6-endo cyclization of various β-hydroxyallenes in the presence of N-iodosuccinimide affords iodinated dihydropyrans in good yield. Subsequent functionalization by palladium-catalyzed crosscoupling opens an access to α-hydroxyallenes that are converted in a second gold-catalyzedcyclization into furopyrans which occur in various natural products.