Abstract
Ru(II)-catalyzed, carboxylic acid-assisted oxidative annulation of N-aryl azoles with alkynes via double C-H activation to produce highly functionalized π-extended imidazo[1,2-a]quinolines is reported. The reaction features a broad substrate generality and tolerates various biologically relevant scaffolds. Interestingly, annulated products showed strong fluorescence properties and an AgIE effect and exhibited a selective fluorescent response toward the Cu2+ ion. Further photocatalytic properties of the product are demonstrated in the photochemical coupling of azoles and arenes.
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