Abstract In the presence of t BuOK, reaction of acetylenes with N -Ts substituted aziridines derived from both cyclic and acyclic alkenes at room temperature gave rise to homopropargylamines in good to high yields and in high regioselectivity. Not only Ph- and Me 3 Si-substituted acetylenes but also acetylene itself was suitable reagents. Treatment of ring-opening products with I 2 and AgOAc in the presence of K 2 CO 3 provided dihydropyrroles in high yields. One-pot synthesis of dihydropyrroles was also realized by the reaction of aziridines and phenylacetylene in the presence of NaH followed by the treatment with I 2 and AgOAc.