Iridium-catalysed ortho-directed deuterium labelling of aromatic esters – an experimental and theoretical study on directing group chemoselectivity

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Abstract

Herein we report a combined experimental and theoretical study on the deuterium labelling of benzoate ester derivatives, utilizing our developed iridium N-heterocyclic carbene/phosphine catalysts. A range of benzoate esters were screened, including derivatives with electron-donating and -withdrawing groups in the para- position. The substrate scope, in terms of the alkoxy group, was studied and the nature of the catalyst counter-ion was shown to have a profound effect on the efficiency of isotope exchange. Finally, the observed chemoselectivity was rationalized by rate studies and theoretical calculations, and this insight was applied to the selective labelling of benzoate esters bearing a second directing group.
Original languageEnglish
Pages (from-to)11676-11698
Number of pages23
JournalMolecules
Volume20
Issue number7
DOIs
Publication statusPublished - 25 Jun 2015

Keywords

  • hydrogen isotope exchange
  • deuterium
  • iridium
  • esters
  • C-H activation
  • DFT

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