Oxygen-Fueled Iterative Hydride Transfer Driven by a Rigid Planar Architecture

Taiga Karimata, Shinya Adachi, Masakatsu Shibasaki, Naoya Kumagai

Research output: Contribution to journalArticlepeer-review


An iterative hydride reduction/oxidation process was promoted under ambient conditions by a quasi-planar iminium cation rigidified by two concatenated quinoline units. The iminium proton was fixed by hydrogen bonding from neighboring quinoline nitrogen atoms, rendering the imine highly susceptible to hydride reduction with weak reductants, e.g., 1,4-dihydropyridines. The thus-formed amine was readily oxidized by molecular oxygen to regenerate the quasi-planar iminium cation under ambient conditions. This process was exploited for catalytic oxidation of 1,4-dihydropyridines as well as 9,10-dihydroacridine to highlight an intriguing rigidity- driven catalysis.

Original languageEnglish
Pages (from-to)595-598
Number of pages4
JournalChemical and Pharmaceutical Bulletin
Issue number9
Publication statusPublished - 2022 Sep 1


  • amine
  • catalytic oxidation
  • hydride transfer
  • imine
  • planar macrocycle
  • quinoline

ASJC Scopus subject areas

  • Chemistry(all)
  • Drug Discovery


Dive into the research topics of 'Oxygen-Fueled Iterative Hydride Transfer Driven by a Rigid Planar Architecture'. Together they form a unique fingerprint.

Cite this