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Keywords:

  • alkynes;
  • enamines;
  • frustrated Lewis pairs;
  • hydroamination;
  • hydrogenation
Thumbnail image of graphical abstract

Catalytic amounts of the Lewis acid B(C6F5)3 enable the hydroamination of terminal alkynes by aryl amines to the corresponding enamines. In accord with the results of stoichiometric reactions, the mechanism of this reaction involves a frustrated Lewis pair (FLP). The hydroamination can be followed by an FLP-catalyzed hydrogenation, resulting in a one-pot stepwise synthesis of amine derivatives.