direct C3 trifluoromethylation of 2-pyridones including unprotected derivatives by an electrochemical approach using the readily available Langlois reagent as the CF3 source in the absence of electrolytes. The trifluoromethylationunder transition metal- and oxidant-free conditions occurred site-selectively to give the desired products in moderate to good yields under ambient conditions. Interestingly
Herein, we report a novel regioselective [2 + 1] cyclization reaction of 2-pyridones with carbenes generated in situ via visible light irradiation, without the requirement for catalysts or additives. The diverse functional groups of 2-pyridones and diazo compounds exhibit good tolerance, enabling the rapidsynthesis of highly valuable cyclopropanated dihydro-2-pyridone scaffolds with exceptional regio-