Gold(I)- and Brønsted Acid-Catalyzed Ring-Opening of Unactivated Vinylcyclopropanes with Sulfonamides

The gold(I)- or Bronsted acid-catalyzed reaction of unactivated vinylcyclopropanes (VCPs) with sulfonamides affords useful homoallylic amine derivatives. This ring-opening reaction occurs in a highly selective manner affording in the case of α-phenyl-substituted VCPs products with the £ -configuration exclusively.