- Triple Regioselective Functionalization of Cationic Helicenes via Iridium-Catalyzed Borylation and Suzuki Cross-Coupling Reactivity
Lucas Frédéric, Bibiana Fabri, Laure Guénée, Francesco Zinna, Lorenzo di Bari, Jérôme Lacour
Chem. Eur. J., in press
In essentially one-pot, using Ir- and Pd-catalysis, tris(arene)-functionalized cationic helicenes are synthesized with full regioselectivity and enantiospecificity starting from a trivial precursor (17 examples). This poly-addition of aryl groups improves key optical properties, i.e. fluorescence quantum yields and lifetimes. Electronic circular dichroism and circularly polarized luminescence signatures are observed up to the far-red domain, in particular with additional arenes prone to aggregation.