Abstract
The synthesis of γ-(4,5-benzindol-3-yl)butyric acid and a number of its derivatives has been effected. It has been shown that the Fischer cyclization of the β-naphthylhydrazones of δ-formylvaleric acid is accompanied by the formation of parasitic compounds identified as esters of ω,ω-di[3-(γ-alkoxycarbonylpropyl)-4,5-benzindol-2-yl] caproic acids. The yield of the latter increases with an increase in the strength of the acid used as the cyclizing agent.
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For Communication I see [14].
Translated from Khimiya Geterotsiklicheskikh Soedinenii, Vol. 6, No. 7,pp. 945–950, July, 1970.
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Shagalov, L.B., Eraksina, V.N., Turchin, K.F. et al. Benzindoles. Chem Heterocycl Compd 6, 878–883 (1970). https://doi.org/10.1007/BF00471680
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DOI: https://doi.org/10.1007/BF00471680