Herein, we disclosed a copper-catalyzed carbogermylation of alkenes through 3,4-difunctionalization of quinoxalin-2(1H)-one to afford 3-oxo-3,4-dihydroquinoxaline 1-oxide incorporated organogermanium derivatives. Despite extensive research on the C-H functionalization of quinoxaline-2(1H)-one, the difunctionalization of this compound through C-C and N-O bond formation via the radical relay process is unusual. DFT calculation and mechanistic studies reveal that the reaction follows a radical pathway.