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Keywords:

  • alkynes;
  • annulation;
  • 1,2-benzothiazines;
  • C[BOND]H activation;
  • sulfoximines
Thumbnail image of graphical abstract

Revitalization by oxygen: A rhodium(III)-catalyzed oxidative C[BOND]H/N[BOND]H activation/annulation sequence provided access to a variety of substituted 1,2-benzothiazine derivatives from readily available NH-sulfoximines and alkynes (see scheme; Cp*=C5Me5). The oxidation system consisted of molecular oxygen in combination with a catalytic amount of Fe(OAc)2.