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Report | Regular issue | Vol 22, No. 4, 1984, pp.791-794
Published online, 1st January, 1970
DOI: 10.3987/R-1984-04-0791
Convenient Synthesis of Benzi[b]tropones Fused with Indolizines or Indoles by Reaction of 2-Phenyl-3-vinyl Substituted Derivatives with Polyphosphoric Acid

Yoshiro Yamashita,* Daisuke Suzuki, and Mitsuo Masumura

*Faculty of Engineering, University of Tokushima, Minamijosanjima-cho, Tokushima 770-8506, Japan

Abstract

Reaction of 2-phenyl-3-(2-ethoxycarbonylvinyl)indolizine derivatives with polyphosphoric acid gave 8H-benzo[6,7]cyclohept[1,2-b]indolizin-8-ones 2 by an intramolecular acylation reaction. Reaction of 2-phenyl-3-(2-ethoxycarbonylvinyl)indole derivatives gave 5H,10H-benzo[6,7]cyclohept[l,2-b]indol-10-ones 7.