One-Pot Synthesis of Polycyclic Sultams Enabled by Gold-Catalyzed Hydroamination of o‑Alkynylbenzenesulfonamides and Subsequent Iodine(III)-Mediated Counteranion-Assisted Intramolecular Annulation

Herein we present a facile and efficient one-pot synthetic protocol for the construction of polycyclic sultams. This protocol involves gold-catalyzed intramolecular hydroamination of o-alkynylbenzenesulfonamides followed by HTIB-mediated counteranion-assisted intramolecular annulation. The transformation tolerates a wide range of functional groups, resulting in the formation of highly functionalized and valuable polycyclic sultam skeletons in moderate to excellent yields. These polycyclic sultams are widely used as key building blocks in organic science.