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Keywords:

  • aldehydes;
  • carbenes;
  • nitrogen heterocycles;
  • stereoselective catalysis;
  • umpolung

Graphical Abstract

Thumbnail image of graphical abstract

A broad spectrum of valuable cyclic and acyclic products are available in diastereo- and/or enantioselective form by sustainable, organocatalytic processes like the heterazolium-catalyzed transformations shown in the scheme. The carbene-mediated generation of activated carboxylate intermediates provides new possibilities for the straightforward synthesis of multifunctionalized compounds.