Efficient synthesis of planar chiral ferrocene-fused heterocyclic molecules is challenging in asymmetric synthesis. Herein, we report an enantioselective C−H activation/annulation of ferrocenecarboxamides with internal alkynes promoted by CpRh(III) catalysis. Trisubstituted chiral Cp-derived Rh complexes are found to be enabling catalysts, which lead to a broad substrate scope with good functional group compatibility. Planar chiral ferrocene-fused pyridone products are obtained in high yields (up to 90%) with excellent enantioselectivity (up to 99% ee). Combined experimental and computational studies support the proposed reaction mechanism.
The dearomative 1,4-difunctionalization of naphthalenes is achieved by imitating the reactivity of simple conjugated dienes in aromatic systems, providing functionalized spirooxindoles in high yields (up to 99%) with exclusive diastereoselectivity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.