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Synthesis of Novel Hybrid Molecules from Precursors With Known Antiparasitic Activity
AbstractThree novel new compounds derived from antiparasitic precursors have been synthesized and tested for their antiamoebic and antigiardial activities. The condensation of 2-(2-methyl-5-1H-nitroimidazolyl)ethylamine (6) with 5-nitro-2-furylacrylic acid (7) gave 3-(5-nitrofuran-2-yl)-N-[2-(5-nitroimidazol-1-yl)ethyl]acrylamide (8). Condensation of 7 with 7-chloro-4-(piperazin-1-yl)quinoline (9) afforded 1-[4-(7-chloroquinolin-4-yl)piperazin-1-yl)-3-(5-nitrofuran-2-yl)propenone as a mixture of two isomers; 10-a (the E-isomer) and 10-b (the Z-isomer). In addition, the reaction of 9 with 1-(2-bromoethyl)-2-methyl-5-nitroimidazole (11) in the presence of K2CO3 and NaI yielded 7-chloro-4-(4-[2-(5-nitroimidazol-1-yl)ethyl]-piprazin-1-yl)quinoline (12). On the basis of preliminary screening data for these new compounds, compound 12 exhibited potent lethal activities against Entamoeba histolytica and Giardia intestinalis; its IC50 ( about 1 µM) was lower, at least by a factor of five, compared to the standard drug, metronidazole. In addition, the IC50 of compound 12 against the tested parasites is 600 times below that against Hep-2 and Vero cells. Compounds 8 and 10-a also exhibited potent or moderate antiamoebic and antigiardial activities with IC50 values of about 5.5 µM, and 140 µM, respectively, against the tested parasites. These two hybrid molecules, 8, 10-a, were also non-cytotoxic at the lethal concentrations against the parasites.
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Saadeh, H.A.; Mosleh, I.M.; Mubarak, M.S. Synthesis of Novel Hybrid Molecules from Precursors With Known Antiparasitic Activity. Molecules 2009, 14, 1483-1494.View more citation formats
Saadeh HA, Mosleh IM, Mubarak MS. Synthesis of Novel Hybrid Molecules from Precursors With Known Antiparasitic Activity. Molecules. 2009; 14(4):1483-1494.Chicago/Turabian Style
Saadeh, Haythem A.; Mosleh, Ibrahim M.; Mubarak, Mohammad S. 2009. "Synthesis of Novel Hybrid Molecules from Precursors With Known Antiparasitic Activity." Molecules 14, no. 4: 1483-1494.