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Keywords:

  • cycloaddition;
  • dienes;
  • multicomponent reactions;
  • Pauson–Khand reaction;
  • rhodium
Thumbnail image of graphical abstract

Three-component [2+2+1] cycloadditions are facilitated by the use of dienes as activated two-carbon-atom components in a RhI-catalyzed intermolecular variant of the Pauson–Khand reaction (see scheme). The enhanced reactivity of the dienes allows efficient access to a variety of alkenyl cyclopentenones from commercially or readily available starting materials. R1, R2=alkyl, silyl, carbonyl; R3=Me, Bn.