Synthetically meaningful isoindolones were accessed by cupraelectro-catalyzed C-H activation with electricity as terminal oxidant. Thus, a versatile, inexpensive, and nontoxic Cu(OAc)(2) catalyst enabled broadly applicable C-H/N-H functionalizations on electron-rich and electron-deficient benzamides with distinct functional group tolerance and resource-economy. Detailed mechanistic studies provided strong support for a C-H alkynylation mechanism through fast C-H metalation, which likewise set the stage for cupraelectro-catalyzed C-H/C-C functionalizations in a decarboxylative fashion.