Summary of main observation and conclusion The radical-initiated carboxylative cyclization of allylamines with CO2 represents an efficient and highly promising strategy to afford valuable 2-oxazolidinones.However,the radical precursors and pathways to generate radicals in such processes are still limited.Herein,we report the first Cu-catalyzed selective oxy-cyanoalkylation of allylamines with cydoketone oxime esters and CO2 via C-C bond cleavage.Many cyanoalkyl-substituted 2-oxazolidinones are obtained in moderate to good yields with high regio-and chemo-selectivities.The utility of this redox-neutral and cyanide-free method is demonstrated with mild conditions,broad substrate scope,good functional group tolerance and easy scalability.