Copper-Catalyzed Regioselective Arylation or Alkenylation of Quinoline N -Oxides with Organoboronates.

A copper-catalyzed arylation or alkenylation of quinoline N -oxides with aryl- or alkenylboronates, respectively, has been developed, which provides an efficient route for C2-substituted oxygenated quinolines under mild reaction conditions. The reaction shows a broad substrate scope for both quinoline N -oxides and aryl/alkenylboronates, mild reaction conditions, and high reaction efficiency. The formation of an aryl- or alkenyl-copper species as the key intermediate was suggested to be involved in this reaction.