Deprotonation of 2-phenyl-1-tosylaziridine 1 with butyl lithium gives an anion that cyclizes to 4 by an intramolecular nucleophilic aromatic addition. Treatment of derivatives 5, 6 with a Grignard reagent produces aziridines 10, 11. © 1991.
Breternitz, H. J., Schaumann, E., & Adiwidjaja, G. (1991). Cyclization of deprotonated 2-phenyl-1-tosylaziridine. A surprising example of an intramolecular nucleophilic aromatic addition. Tetrahedron Letters, 32(10), 1299–1302. https://doi.org/10.1016/S0040-4039(00)79650-X