In this task, you will be given a passage to read. A fill in the blank question will be given to you.  Your answer should fit the blank appropriately.

 The synthesis of aziridines from imines is another important application of the Johnson – Corey – Chaykovsky reaction and provides an alternative to amine transfer from oxaziridines . Though less widely applied , the reaction has a similar substrate scope and functional group tolerance to the carbonyl equivalent . The examples shown below are representative ; in the latter , an aziridine forms in situ and is opened via nucleophilic attack to form the corresponding amine . fill in the blank  :The synthesis of aziridines from imines is another important application of the Johnson – Corey – Chaykovsky reaction and provides an __________________ to amine transfer from oxaziridines . 
 alternative 