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Keywords:

  • cyclization;
  • iodine;
  • oxidation;
  • substituent effects;
  • synthetic methods
Thumbnail image of graphical abstract

Halogen bond: The choice of the iodonium complex of pyridines, either IPy2PF6 or I(coll)2PF6 (Py=pyridine; coll=2,4,6-trimethylpyridine), was crucial for controlling the iodocyclization/oxidation sequence of α-propargylic glycine derivatives. This reagent-controlled system enabled switchable access to 2,3-dihydropyrroles and pyrroles (see scheme).