Rh/Cu‐Catalyzed Cascade [4+2] Vinylic C−H O‐Annulation and Ring Contraction of α‐Aryl Enones with Alkynes in Air. (9th March 2017) - Zhao, Yinsong
Abstract: An unprecedented Rh‐catalyzed ketone‐directed vinylic C−H activation/[4+2] O ‐annulation of α‐aryl enones with internal alkynes followed by a Cu‐catalyzed ring contraction in air to provide multiaryl‐substituted furan derivatives has been developed. The preliminary mechanism study identifies the active pyrylium salt as the key intermediate.