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

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


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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