Phenylisoxazole-3/5-Carbaldehyde Isonicotinylhydrazone Derivatives: Synthesis, Characterization, and Antitubercular Activity: Synthesis, Characterization, and Antitubercular Activity

Fernando Carlos Carrasco Solis, Wilfredo Román Hernandez Gorritti, Oscar Chupayo, Patricia Sheen, Mirko Zimic, Jorge Coronel, Celedonio M. Álvarez, Sergio Ferrero, Sandra Oramas-Royo, Evgenia Spodine, Jesus M. Rodilla, Juan Z. Dávalos

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Abstract

Eight new phenylisoxazole isoniazid derivatives, 3-(2′-fluorophenyl)isoxazole-5-carbaldehyde isonicotinylhydrazone (1), 3-
(2′-methoxyphenyl)isoxazole-5-carbaldehyde isonicotinylhydrazone (2), 3-(2′-chlorophenyl)isoxazole-5-carbaldehyde
isonicotinylhydrazone (3), 3-(3′-clorophenyl)isoxazole-5-carbaldehyde isonicotinylhydrazone (4), 3-(4′-bromophenyl)
isoxazole-5-carbaldehyde isonicotinylhydrazone (5), 5-(4′-methoxiphenyl)isoxazole-3-carbaldehyde isonicotinylhydrazone (6), 5-
(4′-methylphenyl)isoxazole-3-carbaldehyde isonicotinylhydrazone (7), and 5-(4′-clorophenyl)isoxazole-3-carbaldehyde isonicotinylhydrazone
(8), have been synthesized and characterized by FT-IR, 1H-NMR, 13C-NMR, and mass spectral data. The 2D
NMR (1H-1H NOESY) analysis of 1 and 2 confirmed that these compounds in acetone-d6 are in the trans(E) isomeric form. This
evidence is supported by computational calculations which were performed for compounds 1–8, using DFT/B3LYP level with the 6-
311++G(d,p) basis set. The in vitro antituberculous activity of all the synthesized compounds was determined against the Mycobacterium
tuberculosis standard strains: sensitive H37Rv (ATCC-27294) and resistant TB DM97. All the compounds exhibited
moderate bioactivity (MIC= 0.34–0.41 μM) with respect to the isoniazid drug (MIC =0.91 μM) against the H37Rv sensitive strain.
Compounds 6 (X= 4′-OCH3) and 7 (X= 4′-CH3) with MIC values of 12.41 and 13.06 μM, respectively, were about two times more
cytotoxic, compared with isoniazid, against the resistant strain TB DM97.
Translated title of the contributionDerivados del fenilisoxazol-3/5-carbaldehído isonicotinilhidrazona: Síntesis, caracterización, y actividad antitubercular
Original languageEnglish
Article numberID 6014093
Number of pages14
Journaljournal of chemistry
Volume2021
Issue numberID 6014093
Early online date31 Oct 2021
DOIs
StatePublished - 31 Oct 2021

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