As noted above, this approach to vicinal chloroamines can allow access to rare heterocycle-substituted aziridines (Scheme 2b). Following the asymmetric protonation process, in situ treatment of the chloroamine with base delivered a library of products 36-53. Variation in the N-aryl component was straightforward, with structural data of complementary product 44 (100% es) confirming the absolute stereochemistry. Variation of the N-heterocycle was also tolerated; however, in this case the observed variation in reaction efficiency was due to the stability of the aziridine products, several of which were found to be particularly reactive and unstable to isolation (e.g., 54-57).