The oxathiazinane products could be ring-opened with a variety of nucleophiles, allowing for the rapid transformation of these heterocycles into value-added products (Scheme 7). For example, stirring 6 with NaN3 at room temperature formed azide 47, which is a triamine surrogate (Scheme 7A). When 2 was reacted with triphosgene and NEt3 at 0 °C, bicyclic oxathiazinane urea 48 formed in good yield (Scheme 7B).