Cobalt Complexes to Catalyze the Dehydrogenative Cross-Coupling Reactions
Co(dmgH)2(DMAP)Cl (1) and Co(dmgH)2PyCl (2) are utilized as catalysts for the oxidant-free dehydrogenative cross-coupling reactions and dehydrogenation reactions of nitrogen-containing heterocyclic rings. For instance, in the presence of 1 and a photoredox catalyst, cyclohexanones react with amines to give the corresponding aniline derivatives via C-N bond formation at the ketone moiety and successive aromatization of the cyclohexane ring. This reaction has the great advantage of not using any oxidants. In addition, the dehydrogenation of nitrogen-containing heterocycles proceeds under similar conditions to give aromatized heterocycles.
- 1) A photochemical dehydrogenative strategy for aniline synthesis
- 2) Acceptorless Dehydrogenation of N-Heterocycles by Merging Visible-Light Photoredox Catalysis and Cobalt Catalysis
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