Abstract
5H-Benzo-2,3-diazepine derivatives are formed in the reaction of 4-ethoxycarbonylbenzo[c]pyrylium perchlorates with excess hydrazine hydrate. It was established that the key intermediate in the reaction is the 2-aminoisoquinolinium cation. A method for the recyclization of 4-cyanobenzo[c]pyrylium salts to 5H-benzo-2,3-diazepine derivatives was found.
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Yu. A. Nikolyukin, S. L. Bogza, and V. I. Dulenko, Khim. Geterotsikl. Soedin., No.4, 465 (1990).
Yu. A. Nikolyukin, S. L. Bogza, T. A. Zaritovskaya, and V. I. Dulenko, InFOU Akad. Nauk Ukr. SSR, Donetsk (1986), All-Union Institute of Scientific and Technical Information (VINITI) Deposited Paper N2800-B86 (4/17/86).
Yu. A. Nikolyukin, L. V. Dulenko, and V. I. Dulenko, Khim. Geterotsikl. Soedin., No. 7, 999 (1986).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1475–1477, November, 1993.
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Bogza, S.L., Nikolyukin, Y.A. Reactions of functionally substituted benzo[c]pyrylium salts. Synthesis of 5h-benzo-2,3-diazepines. Chem Heterocycl Compd 29, 1268–1270 (1993). https://doi.org/10.1007/BF00532022
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DOI: https://doi.org/10.1007/BF00532022