Highly enantioselective oxidation of sulfides to sulfoxides by a new oxaziridinium salt

The new oxaziridinium salt 5 (R-2 = TBDPS) is an effective reagent for the highly enantioselective oxidation of sulfides to sulfoxides with up to > 99% ee and good yields. As such, it represents a new valuable nonmetallic alternative to the existing methods for asymmetric sulfoxidation.