Synthesis of Functionalized α-Pyrone and Butenolide Derivatives by Rhodium-Catalyzed Oxidative Coupling of Substituted Acrylic Acids with Alkynes and Alkenes
The straightforward and efficient synthesis of α-pyrone and butenolide derivatives has been achieved by the rhodium-catalyzedoxidativecoupling reactions of substituted acrylic acids with alkynes and alkenes, respectively. Some α-pyrones obtained exhibit solid-state fluorescence.
A highly efficient rhodium(III)‐catalyzed directoxidative annulation of acrylicacid with alkynes to form α‐pyrones was developed. Various substituted acrylicacids were compatible in this transformation, affording the corresponding products in moderate to excellent yields under mild conditions.