Preparation and intramolecular radical cyclization of some cyclic N-sulfonylenamines

Abstract

Cyclic N-sulfonylenamines can be prepared under mild conditions from the corresponding lactams by an efficient two-step procedure involving diisobutylaluminium hydride (DIBAL) or LiAIH₄ reduction followed by CF₃CO₂H induced dehydration. In addition, appropriately substituted N-sulfonylenamines are substrates in intramolecular radical cyclizations, forming the corresponding spirocyclic sulfonamides in good yields.