Introduction: Chalcone, isoxazole and acridines have diverse biological activities. A series of novel chalcone and isoxazole substituted 9-anilinoacridines were synthesized for their antibacterial, larvicidal, activities.
Methods:A series of novel chalcone and isoxazole substituted 9-anilinoacridines (3a-h and 4a-h) were synthesized from 9-chloroacridine by microwave irradiation method. The antibacterial evaluation was performed by cup-plate method and screened for their larvicidal activity by larval bioassay method.
Result:The compounds 3d, 3e, 3f, 3h, 4d, 4f have significant antibacterial activity against Gram +ve bacteria like Staphylococcus aureus, Bacillus megaterium, and Gram -ve Escherichia coli, Klebsiella pneumoniae at 25µg/ml. Compounds 3c, 3f, 4a, 4f have significant larvicidal activity against culex and anopheles species at LC 50 value of 17-36ppm.
Conclusion:Many of the compounds have significant antibacterial and larvicidal activities, which are used for further refinement.activity against culex and anopheles species are described. As a part of our ongoing research on searching new potent antimicrobial and larvicidal agents, we have synthesized 9-anilinoacridine analogues bearing the isoxazole residue on anilino rings for antimicrobial and larvicidal evaluation. The results revealed that the newly synthesized derivatives exhibited significant biological activities.
Materials and MethodsMelting points were obtained on Veego VMP-1 apparatus in open capillary tubes and are uncorrected. The reactions were monitored by TLC on silica gel thin layer plates. Compounds were analyzed for C, H, N and analytical results obtained for these elements were within ±0.5% of the calculated values for the formula shown. IR spectra were obtained using a Perkin Elmer spectrum-2 FT-IR spectrometer. 1 HNMR and 13 C NMR were recorded on Bruker A VIII 500 MHz Spectrometer. Chemical shifts are in parts per million (ppm). Mass spectra of the final compounds were recorded on a JEOL GC mate Mass Spectrometer. Microwave irradiation was carried out in cata scientific microwave synthesis system 2400 MHZ, catalyst systems, India.
Synthesis and characterisation of the compoundsThe compounds were synthesized by microwave irradiation (MW) methods and schematized in scheme 1. The yield and reaction time were summarized (Table 1).