Oxidative Cross-Dehydrogenative C-H Bond Amination of Imidazo[1,2-a]pyridines in Aqueous Media Under Metal-free Conditions

The metal-free direct oxidative cross-dehydrogenative C-H bond amination of imidazopyridines with pyrazole in water as solvent has been developed under K₂S₂O₈-promoted mild conditions. This strategy applies to variable imidazoheterocycles to give amination products in moderate to good yield. The described protocol also offers scale-up synthesis for the construction of C-N bonds, which makes it suitable for the synthesis of biologically active compounds and pharmaceuticals.