SYNTHESIS AND ANTIBACTERIAL ACTIVITY OF SOME NOVEL COUMARINYL OXADIAZOLE DERIVATIVES

A novel series of 3[2-(5-pyridin-4-yl)-1,3,4-oxadiazol-2-ylthio] acetyl-2H-chromen-2-ones IV(a-h) were synthesized by the reaction of 2-pyridyl-1,3,4-oxadiazol-2-thiol (111) and substituted 3-bromo acetyl coumarins II(a-h) in presence of sodium ethoxide. The purity of the synthesized compounds was confirmed by their physical constants and TLC. The structures of the synthesized compounds were further confirmed by IR, NMR and mass spectral data. All the synthesized compounds were screened for antibacterial activity using broth microdilution method and gentamycin as standard drug. Among the series IVb, IVc, IVg and IVh compounds showed good antibacterial activity.