Catalytic Asymmetric Hydrogen Atom Transfer: Enantioselective Hydroamination of Alkenes

Benjamin G. Hejna, Jacob M. Ganley, Huiling Shao, Haowen Tian, Jonathan D. Ellefsen, Nicholas J. Fastuca, Kendall N. Houk, Scott J. Miller, Robert R. Knowles

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We report a highly enantioselective radical-based hydroamination of enol esters with sulfonamides jointly catalyzed by an Ir photocatalyst, Brønsted base, and tetrapeptide thiol. This method is demonstrated for the formation of 23 protected β-amino-alcohol products, achieving selectivities up to 97:3 er. The stereochemistry of the product is set through selective hydrogen atom transfer from the chiral thiol catalyst to a prochiral C-centered radical. Structure-selectivity relationships derived from structural variation of both the peptide catalyst and olefin substrate provide key insights into the development of an optimal catalyst. Experimental and computational mechanistic studies indicate that hydrogen-bonding, π-π stacking, and London dispersion interactions are contributing factors for substrate recognition and enantioinduction. These findings further the development of radical-based asymmetric catalysis and contribute to the understanding of the noncovalent interactions relevant to such transformations.

Original languageEnglish (US)
Pages (from-to)16118-16129
Number of pages12
JournalJournal of the American Chemical Society
Volume145
Issue number29
DOIs
StatePublished - Jul 26 2023

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Biochemistry
  • Catalysis
  • Colloid and Surface Chemistry

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