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Keywords:

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

Closing the circle: RhI-catalyzed [2+2+1] cycloadditions are achieved under mild reaction conditions and in good to excellent yields with catalyst loading as low as 0.1 mol %. The diene–allenes react selectively with the proximal double bonds of the allene and diene units, thus allowing for a variety of substitutions. DCE=1,2-dichloroethane, TFE=2,2,2-trifluoroethanol, Ts=tosyl.