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To exploit the potential biological activities of azabicyclic based, seven 2r, 4c-diaryl-3-azabicyclo [3.3.1] nonan-9-one-2'-thienoyl hydrazone were synthesized. The structural elucidation and stereochemistry of these compound assigned by FT-IR, 1 H, 13 C and 2D NMR spectral data. The Structural Activity Relationship (SAR) of the target compounds were examined for their in vitro antiproliferative, antioxidant and antimicrobial activities. The initial screen was treated against human liver cancer cell lines (HepG2) with IC50 values determined by MTT assay. Fluoro substitution at para position of phenyl ring compound 12 showed more antiproliferative activity against HepG2 at half maximum inhibitory concentration (IC50 = 3.76 µg/mL) than other target hydrazones. The mechanism of the antitumor action of active compound 12 was investigated through Hoechst stain 33342 analyses. It indicated that the compound inhibited HepG2 cancer cells proliferation by triggering apoptotic cell death. The Free radical scavenging activity of all synthesized compounds were evaluated with DPPH • , OH • and • 2 O − radicals. The compounds 11 (IC50 rang 3.78 -4.31 µg/mL) and 15 (IC50 rang 4.61 -5.16 µg/mL) were exhibited higher free radical scavenging activity than standard BHT drug. Besides, all the target compounds were screened for their in vitro antibacterial and antifungal activity against a spectrum of microbial organisms by using twofold dilution method. These studies proved that halogen substituted compounds 12, 13 and 14 were showed excellent inhibitory potency at lowest minimum inhibitory concentration (MIC) range of 6.25 -25.5 µg/mL. Nevertheless, multiple mechanisms regulating the antioxidant and anticancer effects of the hybrid molecules need to be further investigations.

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Thiadiazole derivatives R 0300Synthesis and Antibacterial Activity of Some 5-(4-Biphenylyl)-7-aryl[3,4-d][1,2,3]-benzothiadiazoles. -The antibacterial activity of the title benzothiadiazoles, e.g. (VIII), is assessed in side-by-side comparison with ciprofloxacin and norfloxaxin against some Gram-positive and Gram-negative bacteria. Compounds (VIII) display a better activity against Gram-positive organisms than the reference compounds. However, compounds (VIII) are nearly inactive against Gram-negative bacteria. -(BALASANKAR, T.; GOPALAKRISHNAN, M.; NAGARAJAN*, S.; Eur.