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Stereospecific Ring Contraction of Bromocycloheptenes through Dyotropic Rearrangements via Nonclassical Carbocation-Anion Pairs.

  • Author(s): Goh, Shermin S;
  • Champagne, Pier Alexandre;
  • Guduguntla, Sureshbabu;
  • Kikuchi, Takashi;
  • Fujita, Makoto;
  • Houk, KN;
  • Feringa, Ben L
  • et al.
Abstract

Experimental and theoretical evidence is reported for a rare type I dyotropic rearrangement involving a [1,2]-alkene shift, leading to the regio- and stereospecific ring contraction of bromocycloheptenes. This reaction occurs under mild conditions, with or without a Lewis acid catalyst. DFT calculations show that the reaction proceeds through a nonclassical carbocation-anion pair, which is crucial for the low activation barrier and enantiospecificity. The chiral cyclopropylcarbinyl cation may be a transition state or an intermediate, depending on the reaction conditions.

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