Importantly, the 97% ee of 15f (Scheme 5B) highlighted our ability to effectively transfer stereochemical information from the aziridine into the products to furnish enantioenriched N-heterocycles for future efforts in DEL synthesis. This experimental result also excludes the possibility of a [4+2] hetero-Diels-Alder reaction being the operative mechanism that leads to the dehydromorpholine products 4f and 12f-15f (Schemes 5A-B).