Electrophilic halogen can promote either halocyclization or Overman rearrangement of allylic trichloroacetimidates. We found that the chemoselectivity was dependent on the nature of the halogenation reagents for primary allylic trichloroacetimidates. A one-pot procedure was developed for the preparation of allylic trichloroacetamides directly from allylic alcohols at room temperature.
