Mohamed A Abdelgawad, Phoebe F Lamie and Osama M Ahmed
A new series of substituted quinolones linked to benzothiazole and/or benzoxazole moieties 5a-l was synthesized. 6-Benzoxazol-2-yl/benzothiazol-2-yl-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid ethyl esters 3a&b were reacted with hydrazine to give the hydrazide derivatives 4a&b and finally, 4a&b were reacted with different aromatic aldehydes giving the target compounds 5a-l. The benzylidene derivatives 5a-l were screened for their cytotoxic activities against breast carcinoma cell lines (MCF-7) and anti-oxidant properties. All the tested compounds 5a-l showed from high to moderate activity as anticancer and anti-oxidant agents. Compounds 5h and 5l showed the highest cytotoxicr activity against MCF-7 (IC50: 0.058 and 0.052 uM, respectively) than 4-(benzothiazol-2-yl) aniline the reference drug (IC50: 0.065 uM). Moreover, compounds 5e, 5g and 5h showed the highest anti-oxidant activity. The structure of the compounds 5a-l was confirmed using IR, 1H NMR, mass spectroscopy and elemental analysis.
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