Add time:08/11/2019         Source:sciencedirect.com

The synthesis, FT-IR, FT-Raman and NMR spectral analysis of an antimicrobial active benzoxazole derivative, 5-[(4-methylphenyl)acetamido]-2-(4-tert-butylphenyl) benzoxazole (MPATB) is reported. The localization of HOMO, LUMO plots in the title compound over the title molecule shows the charge transfer in the molecular system through the conjugated paths.The electrophilic and nucleophilic sites are revealed from the molecular electrostatic potential map. The first hyperpolarizability of the title compound is greater than that of the standard nonlinear optical material urea and the title compound and its derivatives are good objects for further research in nonlinear optical analysis. Molecule sites prone to electrophilic attacks have been detected by calculation of average local ionization energies, while calculations of Fukui functions have provided additional information about the local reactivity properties. Bond dissociation energies have been calculated in order to investigate autoxidation possibilities of the title molecule, as well as to determine the weakest bonds and therefore the sites where process of degradation could start. Reactive properties with water have been investigated by molecular dynamics simulations and calculations of radial distribution functions. The compound possessed broad spectrum activity against all of the tested Gram-positive and Gram-negative bacteria and yeasts, their minimum inhibitory concentrations ranging between 8 and 128 μg/ml. The compound exhibited significant antifungal activity (64 μg/ml) against Candida krusei, at same potency with the compared standard drugs fluconazole. The docked title compound forms a stable complex with thymidylate synthase and got a binding affinity value of −8.5 kcal/mol and the title compound can be a lead compound for developing new anti-cancerous drug.

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