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A series of novel triazolothiadiazolethione and triazolothiadiazine appended indolo[3,2- c ]isoquinoline-5-one were designed, synthesized, and validated by IR,  1 H,  13 C NMR, and mass spectroscopy strategies. All compounds are determined by their DFT investigations with B3LYP/def2-TZVP basis set level, ionization potentials, and electron affinities at vertical (IPv and EAv) and adiabatic parameters (IP A  and EA A ). Compound  3a  has demonstrated the greatest values for these parameters. The compounds’ HOMO-LUMO (FMOs) and MEP maps were performed. The optimized structure of the compounds was estimated in global hardness, softness, global electrophilicity, and dipole moment. To find new drug candidates, different  in vitro  biological activities were implemented employing antimicrobial activity: Gram-negative bacteria were significantly suppressed by compound  4a , whereas gram-positive bacteria were strongly inhibited by compounds  3c  and  3a  has significant antifungal and anticancer effects. Compound  4b  is profoundly antioxidant with IC 50  value of 8.74 ± 1.93 µg/mL and MIC value of 0.25 µg/mL for antituberculosis properties. Thereafter, all of the compounds were subjected to e-pharmacophore approach to molecular docking studies. Compound  4a  exhibited the best docking score (−8.458 kcal/mol) and docking interactions with active binding sites of 1TL8 receptor.

polycyclic aromatic compounds

Design, Synthesis of Some Innovative Indolo[3,2- c ]Isoquinoline-5-One Analogs and Associated Bioactivities, Pharmacophore, Molecular Docking, MEP, and Conceptual DFT Studies