Both the lack of a credible malaria vaccine and the emergence and spread of parasites resistant to most of the clinically used antimalarial drugs and drug combination have aroused an imperative need to develop new drugs against malaria. In present work, alpha-pyranochalcones and pyrazoline analogs were synthesized to discover chemically diverse antimalarial leads. Compounds were tested for antimalarial activity by evaluation of the growth of malaria parasite in culture using the microtiter plate based SYBR-Green-I assay. The (E)-3-(3-(2,3,4-trimethoxyphenyl)-acryloyl)-2H-chromen-2-one (Ga6) turned out to be the most potent analog of the series, showing IC(50) of 3.1 mu g/ml against chloroquine-sensitive (3D7) strain and IC(50) of 1.1 mu g/ml against chloroquine-resistant field isolate (RKL9) of Plasmodium falciparum. Cytotoxicity study of the most potent compounds was also performed against HeLa cell line using the MTT assay. All the tested compounds showed high therapeutic indices suggesting that they were selective in their action against the malaria parasite. Furthermore, docking of Ga6 into active site of falcipain enzyme revealed its predicted interactions with active site residues. This is the first instance wherein chromeno-pyrazolines have been found to be active antimalarial agents. Further exploration and optimization of this new lead could provide novel, antimalarial molecules which can ward off issues of cross-resistance to drugs like chloroquine. (C) 2010 Elsevier Ltd. All rights reserved.
Rationally synthesized coumarin based pyrazolines ameliorate carrageenan induced inflammation through COX-2/pro-inflammatory cytokine inhibition
in vitro and in vivo anti-inflammatorypotential. Amongst the synthesized compounds, compounds 7a, 7d and 7f exhibited significant in vitro anti-inflammatory activity as compared to the standard etoricoxib. Keeping this in mind, in vivo investigations were carried out via carrageenan induced inflammation and aceticacid induced writhing models in male Wistar rats and compound 7a was found to possess
Expeditious synthesis of coumarin-pyridone conjugates molecules and their anti-microbial evaluation
作者:Rajni Khajuria、Sheena Mahajan、Ambica、Kamal K Kapoor
DOI:10.1007/s12039-017-1362-7
日期:2017.10
and 2d, 2m were found to be moderately active against all the tested fungal organisms. Compound 2k showed good inhibitory potential against the tested yeasts organisms. Graphical Abstract Expedient synthesis of coumarin-pyridone conjugate molecules has been reported via one-pot, three-component reaction between (E)-3-(3-arylacryloyl)-2H-chromen-2-ones, ethyl 2-nitroacetate and ammonium acetate. Anti-microbial