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Note | Regular issue | Vol 60, No. 2, 2003, pp.405-411
Published online, 24th December, 2002
DOI: 10.3987/COM-02-9655
Synthesis of an Annulenoannulenone, 3H-Benzo[e]cycl[3.3.2]azin-3-one

Yoshiro Matsuda,* Shinya Kohra, Keisuke Katou, Takashi Uemura, and Kouhei Yamashita

*Faculty of Environmental Studies, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Japan

Abstract

A new nitrogen-bridged annulenoannulenone, 3H-benzo[e]cycl[3.3.2]-azin-3-one (10a) was synthesized from the starting phenylpyridine (6) via the reaction of the indolizine derivative (9a) with polyphosphoric acid (PPA) as the key step.