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Communication | Regular issue | Vol 12, No. 11, 1979, pp.1427-1432
Published online, 1st January, 1970
DOI: 10.3987/R-1979-11-1427
Base Catalysed Ring Expansion of an 2-Azabicyclo[3.2.0]heptane-3,4-dione to a Dihydroazatropolone: A New Azatropolones

Takehiro Sano,* Yoshie Horiguchi, and Yoshisuke Tsuda*

*Showa Pharmaceutical University, 3-3165, Higashi-tamagawagakuen, Machida, Tokyo 194-8543, Japan


The syntheses of azatropolones, new nonbenzenoid aromatic compounds, are described. Base catalysed ring expansion of an 2-azabicyclo[3.2.0]heptane-3,4-dione gave a dihydroazatropolone, which was dehydrogenated with DDQ oxidation to give an azatropolone.