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Keywords:

  • cyclization;
  • fused-ring systems;
  • gold;
  • indium;
  • synthetic methods
Thumbnail image of graphical abstract

Consecutive formation of C[BOND]N and C[BOND]S bonds: The gold-catalyzed intramolecular aminosulfonylation of 2-alkynyl-N-sulfonylanilines 1 (R1=H) produces 3-sulfonylindoles 2 in good to high yields, whereas the indium-catalyzed aminosulfonylation of 2-alkynyl-6-methoxy-N-sulfonylanilines 1 (R1=MeO) affords 6-sulfonylindoles 3 as the major products (see scheme).