Palladium-Catalyzed Proaromatic C(Alkenyl)–H Olefination: Synthesis of Densely Functionalized 1,3-Dienes
Yuchun Wang, Yen-Hsiang Huang, Hung-Chang Tsai, R. Sidick Basha, Chih‐Ming Chou
Abstract
An example of proaromatic C(alkenyl)-H olefination is reported. This protocol utilized a free carboxylic acid as a directing group for C(alkenyl)-H activation of 1,4-cyclohexadiene and coupled with various alkenes. Direct and sequential bisolefinations of proaromatic acids were achieved. The synthetic applicability has been exhibited by [4 + 2] cycloaddition and decarboxylative aromatization of the resulting proaromatic 1,3-dienes. Additionally, several kinetic studies also have been carried out to elucidate the reaction mechanism.
Topics & Concepts
ChemistryPalladiumCatalysisOrganic chemistryCombinatorial chemistryMedicinal chemistryCatalytic C–H Functionalization MethodsCatalytic Cross-Coupling ReactionsCatalytic Alkyne Reactions