A similar approach was applied to vary the ASF reagents, and to modify the N-group. Removal of the Cbz was achieved using TMSI to provide the free NH azetidine in quantitative yield with PMP derivative 145. Using the OTIPS derivative gave phenol 146. In both cases, the azetidine nitrogen could be selectively functionalized with Boc anhydride. PMP derivative 145 was converted to PMP(Boc)ASF 147 and pleasingly, the deFS reactivity of this ASF was retained, confirmed with efficient coupling with morpholine (149). Having proven that the Cbz protecting group, which was crucial in our catalytic methods, 8 was not required for deFS reactivity, it greatly widens the potential for differently N-functionalized ASFs. Curiously, the PMP(Boc)ASF 147 required lower reaction temperatures, from 0 °C and slowly warming to 40 °C to avoid unproductive formation of the arylazetidin-3-ol and azetidine fluoride.