Synthesis of Some New Heteroarylamino-3-Nitro-2H-[1]-Benzopyran-2-ones and their Antibacterial Activity
Keywords:
Thiazolidin-4-one, benzopyran-2-one, condensiation, antibacterial, inhibition zones.Abstract
Novel derivatives of benzopyran-2-ones are synthesized by catalytic condensation reaction. 4-(3-Hydroxy-2-pyridinylamino)- 3-nitro-2H-[1]-benzopyran-2-one 4a, 4-(4-methyl-3-nitro-2-pyridinylamino)-3-nitro-2H-[1]-benzopyran-2-one, 4b and 4-(pyrimidinylamono)-3-nitro-2H-[1]-benzopyran-2-ones 4(c, d) are synthesized by condensation of 4-Chlor-3-nitro-2H-[1]-benzopyran-2-one 2 and corresponding heteroarylamines 3(a-d ) under reflux reaction conditions. Alkali hydrolysis of 4(a-d ) afforded the 2-hydroxy-? -nitroacetophenone 5. Structural characterization of the synthesized products is done on the basis of spectrometric data. Antibacterial activity of the compounds 4(a-d) against S. aureus, E. coli and Klebsiella was examined by measuring the inhibition zones around the disks marked with the corresponding product solutions in N,N-DMF concentration 2 mg/mL , 4 mg/mL and 6 mg/mL. Compounds 4a and 4c have shown significant antibacterial activity against S. aureus, compounds 4b and 4d exhibited significant activity against E. coli whereas compound 4d was more active against Klebsiella.
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