Synthesis 2024; 56(08): 1324-1334
DOI: 10.1055/a-2218-9177
paper

New Synthesis of Pyrazolo[3,4-b]pyridine Derivatives Based on 5-Aminopyrazole and Azlactones

Authors

  • Vladislav Yu. Shuvalov

    a   Laboratory of New Organic Materials, Omsk State Technical University, 11 Mira Ave., 644050 Omsk, Russian Federation
  • Anton L. Shatsauskas

    a   Laboratory of New Organic Materials, Omsk State Technical University, 11 Mira Ave., 644050 Omsk, Russian Federation
  • Tatyana Yu. Zheleznova

    a   Laboratory of New Organic Materials, Omsk State Technical University, 11 Mira Ave., 644050 Omsk, Russian Federation
  • Anastasia S. Kostyuchenko

    a   Laboratory of New Organic Materials, Omsk State Technical University, 11 Mira Ave., 644050 Omsk, Russian Federation
    b   Department of Organic and Analytical Chemistry, F. M. Dostoevsky Omsk State University, Mira Ave., 55a, 644077 Omsk, Russian Federation
  • Alexander S. Fisyuk

    a   Laboratory of New Organic Materials, Omsk State Technical University, 11 Mira Ave., 644050 Omsk, Russian Federation
    b   Department of Organic and Analytical Chemistry, F. M. Dostoevsky Omsk State University, Mira Ave., 55a, 644077 Omsk, Russian Federation

This work was supported by the Russian Science Foundation (grant No. 22-13-00356).


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Abstract

Reaction of 5-amino-3-methyl-1-phenyl-1H-pyrazole with azlactones under solvent-free conditions with heating furnished tetrahydro-1H-pyrazolo[3,4-b]pyridines. The latter were converted to oxazolo[5,4-b]pyrazolo[4,3-e]pyridines by the action with POCl3 on air. Further reaction of oxazolo[5,4-b]pyrazolo[4,3-e]pyridines with hydrazine hydrate and alkali led to the formation of 5-amino-1,7-dihydro-6H-pyrazolo[3,4-b]pyridin-6-ones, which reacted with aluminum chloride to yield 3,4-dihydro-5H-pyrazolo[4,3-f][1,7]naphthyridin-5-ones. Some of the synthesized compounds show antioxidant activity or are effective phosphors.

Supporting Information



Publication History

Received: 22 October 2023

Accepted after revision: 28 November 2023

Accepted Manuscript online:
28 November 2023

Article published online:
08 January 2024

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