Electrophilic amination: preparation and use of N-Boc-3-(4-cyanophenyl)oxaziridine, a new reagent that transfers a N-Boc group to N- and C-nucleophiles
We describe the preparation of the title compound 2b via aza-Wittig reaction of N-Boc-triphenyliminophosphorane (6) with 4-cyanobenzaldehyde followed by Oxone oxidation of the resulting imine 5b. Oxaziridine 2b is a stable, crystalline solid, which transfers under mild conditions its N-Boc fragment to primary and secondary amines (to give N(beta)-Boc-hydrazines) and enolates (to give N-Boc-amino derivatives).