With an intention to synergize the anti-bacterial activity of chalcones and rhodanine-3-acetic acid, several hybrid compounds possessing chalcone and rhodanine-3-acetic acid moieties were synthesized and tested for their anti-bacterial activity. Some compounds presented great anti-microbial activities against Gram-positive bacteria (including the multidrug-resistant clinical isolates). This class of
Following our previously reported Prins cyclization strategy, a series of novel and highly functionalized flavonoid based THPs (Prins products) were designed, synthesized and evaluated for their anti-proliferative activity. Novel products were afforded in excellent yields (72-96%) within 20-90 min at 62 degrees C using flavonoid aldehydes, homoallylic alcohols, p-TSA center dot H2O (catalyst and reagent) and MS 4 angstrom in CHCl3. Deprotection of tosyl group was achieved with TFA (catalyst and solvent) at 140 degrees C to obtain 4-hydroxytetrahydropyrans and further reaction of 4-hydroxytetrahydropyrans with cinnamoyl chloride afforded 4-cinnamate tetrahydropyrans under neat condition. Synthesized compounds evaluated against human cancer cell lines (Hep3 beta, MCF-7 and Hela), have shown moderate to good antiproliferative activity in vivo. Compounds 3q and 3zb exhibited similar cytotoxicity (IC50 6.6 +/- 1.4, 6.9 +/- 1.0 mu M, respectively) to the reference drug doxorubicin (IC50 7.6 +/- 0.9 mu M) against the MCF-7 cancer cell line. Compound 3zb was found equally active as the standard drug (IC50 4.48 +/- 2.1 mu M) against the Hep3 beta cell line and compounds 3c and 3q showed moderate cytotoxicity (IC50 10.40 +/- 1.1, 12.9 +/- 1.7 mu M, respectively) against the HeLa cell line. (C) 2014 Elsevier Masson SAS. All rights reserved.
Synthesis and antimicrobial evaluation of l-phenylalanine-derived C5-substituted rhodanine and chalcone derivatives containing thiobarbituric acid or 2-thioxo-4-thiazolidinone
Four novel series of compounds, including the L-phenylalanine-derived C5-substituted rhodanine (6a-q, 7a-j) and chalcone derivatives containing thiobarbituric acid or 2-thioxo-4-thiazolidinone (9a-e, 11a-e) have been designed, synthesized, characterized, and evaluated for their antibacterial activity. Some of these compounds showed significant antibacterial activity against Gram-positive bacterias, especially against the strains of multidrug-resistant clinical isolates, among which compounds 6c-e, 6g, 6i, 6j and 6q exhibiting high levels of antimicrobial activity against Staphylococcus aureus RN4220 with minimum inhibitory concentration (MIC) values of 2 mu g/mL. Compound 6q showed the most potent activity of all of the compounds against all of the test multidrug-resistant clinical isolates tested. Unfortunately, however, none of the compounds were active against Gram-negative bacteria at 64 mu g/mL. (C) 2012 Elsevier Masson SAS. All rights reserved.
Synthesis of Chalcone Derivatives as COX-2 Inhibitory Activity for Ischemic Stroke Treatment