Figure 3. Discussion on the reaction pathway.

(a) Control reaction to exclude the formation of 5c from aziridine 7. (b) Proposed reaction pathway for the formation of 6 via iminium intermediate C. (c) Control reaction to exclude the formation of 5c from N–H insertion product 9. (d) Reaction under the catalysis of a premade palladium/phosphate complex to confirm the active catalyst.