Sequential Unsymmetrical Aryl Coupling of <i>o</i>-Substituted Aryl Iodides with <i>o</i>-Bromophenols and Reaction with Olefins: Palladium-Catalyzed Synthesis of 6<i>H</i>-Dibenzopyran Derivatives
Dibenzopyran derivatives are prepared by palladium- and norbornene-catalyzed reaction of aryliodides, o-substituted with electron-releasing substituents, o-bromophenols, and activated alkenes.
Unsymmetrical Aryl-Aryl Cross-Coupling Leading to 6<i>H</i>-Dibenzopyrans
作者:Marta Catellani、Elena Motti、Nicola Della Ca’、Raffaella Ferraccioli
DOI:10.1055/s-2007-990934
日期:2008.3
6H-Dibenzopyrans are prepared starting from ortho-substituted aryl iodides, o-bromophenols and activated olefins, in the presence of a catalytic system based on palladium acetate and norbornene by means of a simple and efficient, one-pot, three-component procedure under mild conditions.