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.