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Greiner, Robert; Ziegler, Dorothee S.; Cibu, Denise; Jakowetz, Andreas C.; Auras, Florian; Bein, Thomas; Knochel, Paul (2017): Preparation of Polyfunctional Naphthyridines by Cobalt-Catalyzed Cross-Couplings of Halogenated Naphthyridines with Magnesium and Zinc Organometallics. In: Organic Letters, Vol. 19, Nr. 23: S. 6384-6387
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CoCl2 (5%) catalyzes cross-couplings of various halogenated naphthyridines with alkyl- and arylmagnesium halides. Also, arylzinc halides undergo smooth cross-couplings with various naphthyridines in the presence of CoCl2 center dot 2LiCl (5%) and sodium formate (50%), leading to polyfunctional arylated naphthyridines. Two of these arylated naphthyridines are highly fluorescent, with quantum efficiencies reaching 95% and long excited-state lifetimes of up to 12 ns.