Manganese(III)-Based Oxidative Dual Cyclization of Cyclic Triketones with 1,1-Disubstituted Alkenes

was suppressed and most of the reaction stopped at the monocyclization stage. The mechanism for the formation of the propellanes and their derivatives was discussed. Some biologically active furopyridinones are known as antifungal and antibacterial heterocycles. For example, cladobotryal and an isomeric furopyridinone, which are metabolites of the fungus