Synthesis of Fluorenes with an All-Carbon Quaternary CenterviaPalladium-Catalyzed Dual Arylation using Cyclic Diaryliodonium Triflates

Abstract Catalyzed by palladium species, cyclic diaryliodonium salts underwent dual C‐aryl functionalization smoothly with activated methylene sources. With this new finding, a series of diversified fluorenes with an all‐carbon quaternary center was quickly constructed. Moreover, our approach also provided various novel spirofluorenes containing barburate acid or indane motifs which are featured in medicinal drugs and functional materials. magnified image