Background: A new variety of adamantyl chalcones (2, 3a-o) were efficiently prepared by Claisen-Schmidt reaction of 4-adamantyl acetophenone 2 with a serie of aromatic aldehydes in good yields. Their structures were confirmed by spectroscopic data, and the relative configuration of 3d was confirmed by X-ray crystallography. All synthesized chalcones were tested against a panel of Grampositive and Gram-negative bacteria and pathogenic fungus and displayed strong antibacterial activity against Enterococcus faecali 29212, Pseudomonas aeruginosa ATCC27853, Escherichia coli and interesting antifungal activity against Candida glabrata ATCC 90030.
Result: The effect of these compounds was also tested in vitro as antitumor on Miapaca2 cells. Compounds also showed anticancer activity against human pancreas cancer cell MiaPaca2.
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A series of analogues of the adamantyl arotinoid (AdAr) chalcone MX781 with halogenated benzyloxy substituents at C2' and heterocyclic derivatives replacing the chalcone group were found to inhibit IκBα kinase α (IKKα) and IκBα kinase β (IKKβ) activities. The growth inhibitory capacity of some analogues against Jurkat T cells as well as prostate carcinoma (PC-3) and chronic myelogenous leukemia (K562) cells, which contain elevated basal IKK activity, correlates with the induction of apoptosis and increased inhibition of recombinant IKKα and IKKβ in vitro, pointing toward inhibition of IKK/NFκB signaling as the most likely target of the anticancer activities of these AdArs. While the chalcone functional group present in many dietary compounds has been shown to mediate interactions with IKKβ via Michael addition with cysteine residues, AdArs containing a five-membered heterocyclic ring (isoxazoles and pyrazoles) in place of the chalcone of the parent system are potent inhibitors of IKKs as well, which suggests that other mechanisms for inhibition exist that do not depend on the presence of a reactive α,β-unsaturated ketone.
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