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Design and Evaluation of Antimicrobial Activity of New Pyrazole, 1,2,4-Triazole, and 1,3,4-Thiadiazol Derivatives Bearing 1,4-Dihydroquinoxaline Moiety
An effective method for synthesizing a series of fifteen new compounds ethyl 3-(2-(3-amino-1,4-dihydroquinoxaline-2-carbonyl)hydrazono )butanoate ( II ), 3-amino-N'-benzylidene-1,4-dihydroquinoxaline-2-carbohydrazide dérivatives ( IV – VI ), phenyl)-4-oxothiazolidin-3-yl)-1,4-dihydroquinoxaline...
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Published in: | Russian journal of bioorganic chemistry 2020-09, Vol.46 (5), p.715-725 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | An effective method for synthesizing a series of fifteen new compounds ethyl 3-(2-(3-amino-1,4-dihydroquinoxaline-2-carbonyl)hydrazono )butanoate (
II
), 3-amino-N'-benzylidene-1,4-dihydroquinoxaline-2-carbohydrazide dérivatives (
IV
–
VI
), phenyl)-4-oxothiazolidin-3-yl)-1,4-dihydroquinoxaline-2-carboxamide derivatives (
VII
–
IX
), 3-(3-amino-1,4-dihydroquinoxalin-2-yl)-5H-[1,2,4]triazolo[3,4-a]isoindol-5-one (
X
), 1,4-dihydroquinoxaline-2-carbonyl)-N-substituted hydrazine carbothioamide (
XI
–
XII
), 5‑(3-amino-1,4-dihydroquinoxalin-2-yl)-4-substituted-4H-1,2,4-triazole-3-thiol (
XIII
–
XIV
) and 5-(3-amino-1,4-dihydroquinoxalin-2-yl)-N-substituted-1,3,4-thiadiazol-2-amine (
XV
–
XVI
) based on 1,4-dihydroquinoxaline moiety in 60–85% yields starting from reaction of hydrazide 3-Amino-1,4-dihydroquinoxaline-2‑carbohydrazide (
I
) with ethyl acetoacetate has been proposed. The designed compounds have been successfully screened in vitro for their antibacterial and antifungal activities. Structural identifications of the obtained products have been carried out by spectroscopic techniques including FTIR,
1
H NMR,
13
C NMR, and mass spectroscopy. The relation between the structure of the synthesized compounds and their activity against selected bacteria and fungi was studied and favorable results were obtained. The majority of tested compounds showed moderate antibacterial activities except compound 3-amino-N-(2-(4-chlorophenyl)-4-oxothiazolidin-3-yl)-1,4-dihydroquinoxaline-2-carboxamide (
VIII
) that notably exhibited the most potent antibacterial activity against the tested
Bacillus subtilis
,
Staphylococcus aureus
,
Escherichia coli
and
Pseudomonas aeruginosa
bacteria. Further antifungal studies indicated that the compounds Ethyl 3-(2-(3-amino-1,4-dihydroquinoxaline-2-carbonyl)hydrazono) butanoate (
II
), 3-amino-N-(2-(4-chlorophenyl)-4-oxothiazolidin-3-yl)-1,4-dihydroquinoxaline-2-carboxamide (
VIII
), 3-amino-N-(2-(4-methoxyphenyl)-4-oxothiazolidin-3-yl)-1,4-dihydro quinoxaline-2-carboxamide (
IX
) and 2-(3-amino-1,4-dihydroquinoxaline-2-carbonyl)-N-phenyl hydrazine carbothioamide (
XI
) exerted the highest antifungal activities against
Aspergillus flavus
and
Candida albic
ans fungi. |
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ISSN: | 1068-1620 1608-330X |
DOI: | 10.1134/S1068162020050076 |