Int II using HOSA as an aminating agent with pyridine or piperidine as the base under mild conditions. The combination of HFIP and pyridine or piperidine is critical to achieve high yield. Notably, this approach showcases broad scope for non-activated alkenes, offering a straightforward method for the syntheses of free N-H aziridines from alkenes. Furthermore, it can be scaled up to gram-scale for the synthesis of aziridines. We hope this practical method will supply a more convenient route for the synthesis of aziridines.