Synthesis, X-ray crystallographic study, pharmacology and docking of hydrazinyl thiazolyl coumarins as dengue virus NS2B/NS3 serine protease inhibitors

AbstractA series of total twenty-one thiazole-coumarin derivatives7a-u, linkedvia hydrazine linkage were synthesized through Hantzsch cyclisation. Out of twenty-one derivatives, fourteen derivatives viz.7b-d, 7g, 7i-k, 7n and7p-u are the novel derivatives. The structures of the synthesized compounds were established by extensive spectroscopic studies (FTIR,1H NMR,13C NMR, 2D NMR, LC-MS) and elemental analysis. The structure of (E)-6-methoxy-3-(1-(2-(4-p-tolylthiazol-2-yl)hydrazono)ethyl)-2H-chromen-2-one (7d) was unambiguously confirmed by X-ray crystallography analysis. Hybrid molecules were evaluated for their potential as anti-tubercular agents againstMycobacterium tuberculosis H37Rv ATCC 25618, and anti-bacterial agents againstEschericia coli, Enterobacter aerogenes, Salmonella typhi, Streptococcus pneumoniae andStaphylococcus aureus. All the compounds displayed considerable potency against all the pathogens with MIC values ranging from 31.25 to 250  μg/mL, therein compounds7i,7j,7k,7q and7t displayed superior inhibitory activities compared to standard drugs streptomycin, kanamycin, vancomycin and isoniazid. Molecular docking studies were performed to check the potential as dengue virus NS2B/NS3 serine protease inhibitors, by comparing to standards 4-hydroxypanduratin, panduratin and ethyl 3-(4-(hydroxymethyl)-2-methoxy-5-nitrophenoxy)propanoate with DS of −3.379, −3.189 and −3.381, respectively. All the compounds were found to exhibit potency against the DENV vi...
Source: Medicinal Chemistry Research - Category: Chemistry Source Type: research