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 cross coupling opens an access to α-hydroxyallenes that are converted in a second gold-catalyzed cyclization into furopyrans which occur in various natural products.
在 N-碘代琥珀酰亚胺存在下,各种 β-羟基丙二烯的立体选择性金催化 6-内环化以良好的收率提供碘化二氢吡喃。随后通过钯催化的交叉偶联进行的功能化打开了获得 α-羟基丙二烯的途径,这些α-羟基丙二烯在第二次金催化的环化中转化为呋喃吡喃,呋喃吡喃存在于各种天然产物中。