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Keywords:

  • alkynes;
  • nitrogen heterocycles;
  • rearrangement;
  • rhodium;
  • ring expansion
Thumbnail image of graphical abstract

Heterocycle construction through the formation of an azametallacycle from an N-allenylnitrone intermediate is demonstrated in the Communication of I. Nakamura et al. on page 10816 ff. The inherently unstable intermediate can be generated in situ by catalytic 2,3-rearrangement from O-propargylic oximes. This tandem reaction can be compared to a flying trapeze knee hang maneuver.