Synthesis and reactions of 1-(4-bromo-, 4-fluoro-, and 4-trifluoromethylphenyl)-6,6-dimethyl-4-oxo-4,5,6,7-tetrahydroindazoles

Authors

  • А. Я. Страков Riga Technical University, Riga LV-1658
  • Н. Н. Тонких Riga Technical University, Riga LV-1658
  • M. B. Петрова Riga Technical University, Riga LV-1658
  • И. А. Стрaкова Riga Technical University, Riga LV-1658

Abstract

From 2-formyldimedone and 4-bromo-, 4-fluoro-, and 4-trifluoromethylphenylhydrazines we have obtained the corresponding 2-arylhydrazinomethylenedimedones, which in acid medium undergo ring closure to form 1-substituted 6,6-dimethyl-4-oxo-4,5,6,7-tetrahydroindazoles. Oxidation of the latter by selenous acid leads to the corresponding 4,5-dioxo-4,5,6,7-tetrahydroindazoles, which then were converted to derivatives of 4,5-dihydro-3H-pyrazolo[4,3-a]phenazine and 4,5-dihydro-1H(3H)-indazolo[4,5-d]imidazole.

How to Cite
Strakov, A. Y.; Tonkikh, N .N.; Petrova, M. V.; Strakova, I. A Chem. Heterocycl. Compd. 1997, 33, 1443. [Khim. Geterotsikl. Soedin. 1997, 1669.]

For this article in the English edition, see DOI https://doi.org/10.1007/BF02291647

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Published

1997-12-25

Issue

No. 12 (1997)

Section

Original Papers