Despite the interesting applications, direct and diverse syntheses of aryl-fused 2-alkyl cyclic amines still remain challenging. Here, the concept of incorporating a C−C coupling process into the N-heteroaryl reduction was successfully applied to fulfill such a synthetic purpose. By controllable electroreduction coupled with proton abstraction, we report a room temperature reductive α-alkylation of the inert N-heteroarenes with abundantly available styrenes in an undivided Zn(+)/C(-) cell. It proceeds with good substrate compatibility and operational simplicity, utilizes cost-effective sacrificial Zn-anode, exhibits high selectivity, and does not need pressurized H₂ gas and transition metal catalysts. The current work offers an useful platform for direct construction of valuable aryl-fused 2-alkyl cyclic amines that are of difficult access with the conventional methods.