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Lavanya, G.; Magesh, C.J.; Venkatapathy, K.; Perumal, P.T.; Prema, S.
Bioorganic chemistry, February 2021, 2021-Feb, 2021-02-00, 20210201, Letnik: 107Journal Article
Display omitted •Design and synthesis of Quinolinyl dihydropyridine carboxylates (QDC) derivatives.•QDC derivatives incorporate the antibacterial activity of quinolines with drug resistance reversal effect of 1,4 DHP’s.•The QDC derivatives were characterized by NMR, FT-IR, Mass and CHN analysis.•The QDC derivatives were screened for antibacterial activity, MIC and cytotoxicity.•Molecular docking studies of QDC diastereomers with bacterial cell wall were studied.•The mode of antibacterial action of QDC derivatives were evaluated via SEM analysis.•All the QDC derivatives exhibited antibacterial activity against vibrio cholera. Novel pyranoquinolinyl dihydropyridine carboxylate (PDC) derivatives were designed by incorporating the multi-drug resistance modulating effects of 1,4 dihydropyridines along with potential antibacterial activity of quinolines in the molecular design. The designed PDC derivatives were synthesized by multi-step synthesis involving Michael addition, reduction followed by inverse electro demand Diels-Alder reaction to produce pyranoquinolinyl dihydropyridine carboxylates in good yields. All the PDC derivatives were characterized by 1H NMR, 13C NMR, FT-IR, Mass spectral and CHN analysis. The Quinolinyl dihydropyridine carboxylate derivatives were evaluated for in vitro antibacterial activity by agar well diffusion method. Molecular docking studies revealed that the exo diethyl 4-(4aR,5S,10bR)-5-(4-chlorophenyl)-3,4,4a,5,6,10b-hexahydro-2H-pyrano3,2-cquinolin-8-yl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate diastereomer (5c) forms four hydrogen bonds with the cell wall protein of vibrio cholerae in comparison to the endo diethyl 4-((4aR,5R,10bR)-5-(4-chlorophenyl)-3,4,4a,5,6,10b-hexahydro-2H-pyrano3,2-cquinolin-8-yl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate diastereomer (4c) which forms two hydrogen bonds with the cell wall protein of vibrio cholerae and hence leading to better anchorage, enhanced gold score and relatively good antibacterial activity for the exo PDC derivatives. Minimum inhibitory concentration (MIC) of the active compounds was evaluated by macro dilution method. The mechanism of antibacterial action of the PDC derivatives was investigated by SEM studies. The cytotoxicity of PDC derivatives were evaluated against fibroblast cells (L-929).
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