Tandem Oxidative Ring Expansion for Synthesis of Dibenzocyclooctaphenanthrenes

Lu Yang, Hidenori Matsuyama, Sheng Zhang, Masahiro Terada, Tienan Jin

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


A novel tandem single-electron oxidative ring expansion reaction has been developed for the construction of the saddle-shaped polycyclic arenes fused with cyclooctatetraene, that is, dibenzo[3,4:7,8]cycloocta[1,2-l]phenanthrenes (dbCOTPs). The combination of Cu(OTf)2 catalyst with DDQ triggered the selective oxidation of o-biphenyl-tethered methylenecirculenes fused with a seven-membered ring, giving rise to the formation of the corresponding eight-membered ring fused dbCOTPs. The present tandem ring expansion of a seven- to an eight-membered ring takes place via the selective single-electron oxidation of the benzylidene moiety, intramolecular spirocyclization, and 1,2-aryl migration sequence.

Original languageEnglish
Pages (from-to)5121-5125
Number of pages5
JournalOrganic letters
Issue number13
Publication statusPublished - 2020 Jul 2

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry


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