Enantioselective Addition Reaction of Azlactones with Styrene Derivatives Catalyzed by Strong Chiral Brønsted Acids

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Abstract

An enantioselective intermolecular addition reaction of azlactones, as carbon nucleophiles, with styrene derivatives, as simple olefins, was demonstrated using a newly developed chiral Brønsted acid catalyst, namely, F10BINOL-derived N-triflyl phosphoramide. Addition products having vicinal tetrasubstituted carbon centers, one of which is an all-carbon quaternary stereogenic center, were formed in good yields with moderate to high stereoselectivities. Extremely high acidity of the new chiral Brønsted acid was confirmed by its calculated pKa value based on DFT studies and is the key to accomplishing not only high catalytic activity but also efficient stereocontrol in the intermolecular addition.

Original languageEnglish
Pages (from-to)8458-8462
Number of pages5
JournalAngewandte Chemie - International Edition
Volume58
Issue number25
DOIs
Publication statusPublished - 2019 Jun 17

Keywords

  • Brønsted acid
  • acidity
  • alkenes
  • asymmetric catalysis
  • organocatalysis

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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