The abundance of oxazepine and oxazepane derivatives is medically interesting compounds continues to ensure that they are important synthetic targets for organic chemists. Synthetic routes to oxazepine and oxazpane derivatives involving direct ring closure are often slow and hampered by unfavorable enthalpies and entropies of the reaction. There are many methods for the synthesis of oxazepane and oxazepine ring system, however, new simple and efficient ways for contracting oxazepine and oxazepane ring are still in great demand.