- Efficient synthesis and molecular modeling of new N-/S-nucleosides and schiff,s bases of tetrahydropyrimidine scaffold as potential H5N1 avian influenza a virus inhibitors
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This study deals with efficient epoxidation of (E)-1-(4-methoxyphenyl)-3-(3,4,5-trimethoxyphen-yl)prop-2-en-1-one (1) with hydrogen peroxide to afford the corresponding epoxide derivative 2, which was allowed to react with either urea or thiourea to afford the corresponding tetrahydropyrimidine-2,5-dione and/or 2-thioxo tetrahydropyrimidin-5(6H)-one compounds 3, 4, respectively. The latter derivatives 3 and 4 were utilized as key precursors for preparation of a new set of tetrahydropyrimidine nucleosides via N- and/or S-glyco-sidic linkages and different Schiff,s bases. These hybrid compounds were evaluated as H5N1 avian influenza A virus inhibitors. N-nucleoside analog 8 and the indolo-Schiffís base 22 demonstrated the most potent antiviral activity showing 71, 76% viral inhibition. Molecular modeling studies revealed that compounds 8 and 22 exhibited effective fitting in the active site, good binding mode and reasonable docking scores with RNA polymerase protein that might explain their effective antiviral potency and represent them as new promising antiviral scaffolds for further developing and optimization.
- Kotb, Eman R.,Khalaf, Hemat S.,Syam, Yasmin M.,Bagato, Ola,Salama, Mwafia A.
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p. 369 - 384
(2018/04/23)
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- Synthesis and biological evaluation of chalcones and their derived pyrazoles as potential cytotoxic agents
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A series of substituted chalcones and their corresponding pyrazoles were synthesized and evaluated for in vitro cytotoxic activity against a panel of human cancer cell lines. Out of 93 compounds screened, 8 compounds, 1s, 3i,j,n, 4i,j,n and 4s, showed marked activity. Compounds 4j,n and 4s were found to be the most promising in this study. SAR is also discussed.
- Bhat,Dhar,Puri,Saxena,Shanmugavel,Qazi
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p. 3177 - 3180
(2007/10/03)
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