Cu-Catalyzed Dehydrogenative C-O Cyclization for the Synthesis of Furan-Fused Thienoacenes

Koichi Mitsudo, Yoshiaki Kobashi, Kaito Nakata, Yuji Kurimoto, Eisuke Sato, Hiroki Mandai, Seiji Suga

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The first Cu-catalyzed dehydrogenative C-O cyclization for the synthesis of furan-fused thienoacenes is described. A variety of heteroacenes including a thieno[3,2-b]furan or a thieno[2,3-b]furan skeleton were synthesized by intramolecular C-H/O-H coupling. The use of a mixed solvent of N-methyl-2-pyrrolidone, ethylene glycol monomethyl ether, and toluene was essential for suppressing side reactions and efficiently promoting the reaction. Double C-O cyclization was also conducted to afford highly π-expanded furan-fused thienoacenes.

Original languageEnglish
Pages (from-to)4322-4326
Number of pages5
JournalOrganic Letters
Issue number11
Publication statusPublished - Jun 4 2021

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry


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