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Russian Journal of Organic Chemistry

, Volume 54, Issue 8, pp 1189–1199 | Cite as

Thermal Rearrangements of 3H- and 4H-Pyrazoles Prepared by Reactions of 9-Diazofluoren with Methyl Tetrolate and Methyl 3-Phenylpropiolate

  • V. A. Vasin
  • Yu. A. Popkova
  • Ye. V. Bezrukova
  • V. V. Razin
  • N. V. Somov
Article
  • 1 Downloads

Abstract

9-Diazofluoren adds in Et2O at 20°C to methyltetrolate in keeping with Auwers rule and nonregioselectively adds to methyl-3-phenylpropiolate with the formation of spirocyclic 3H-pyrazoles. The methyltetrolate adduct at boiling in toluene converts into methyl 3a-methyl-3aH-dibenzo[e,g]indazole-3-carboxylate, at 190°C in benzene, into methyl 3-methyl-2H-dibenzo[e,g]indazole-2-carboxylate, and at 160°C in methanol, into 3-methyl-2H-dibenzo[e,g]indazole. Auwers adduct of methyl 3-phenylpropiolate at boiling in benzene gives cyclopropene derivative and at boiling in methanol isomerizes into methyl 3a-phenyl-3aHdibenzo[e,g]indazole-3-carboxylate. Anti-Auwers adduct at boiling in benzene isomerizes into methyl 2-phenylpyrazolo[1,5-f]phenanthridine-3-carboxylate.

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • V. A. Vasin
    • 1
  • Yu. A. Popkova
    • 1
  • Ye. V. Bezrukova
    • 1
  • V. V. Razin
    • 2
  • N. V. Somov
    • 3
  1. 1.Ogarev Mordovian State UniversitySaranskRussia
  2. 2.St. Petersburg State UniversitySt. PetersburgRussia
  3. 3.Lobachevsky State University of Nizhny NovgorodNizhny NovgorodRussia

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