- 2-[N-Alkyl(R-phenyl)-aminomethyl]-3-phenyl-7-trifluoromethylquinoxalines as anticancer agents inhibitors of folate enzymes
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Based on our previous results on the ascertained potent growth inhibition effect against a panel of 60 human tumors cell lines at National Cancer Institute of Bethesda (NCI), we have synthesized a novel series of thirty-one 2-[N-methyl(R-phenyl)-aminomethyl]-3-phenyl-7-trifluoromethylquinoxalines (1-31). The lead compound 1 was previously reported to be endowed with significant inhibition against hDHFR enzyme, with a Ki of 0.2 μM. Docking studies were performed on compound 1 and here reported to predict its binding conformation to human dihydrofolate reductase (hDHFR). All compounds (1-31) were assayed versus hDHFR and human thymidylate synthase (hTS). From the screening emerged that all compounds inhibited hDHFR with Ki values included between 0.2 and 11 μM, while only a few (6, 21, 24, 27, 29) showed great activity and selectivity towards hTS. Evaluation of the anticancer activity was performed by NCI, first against the three cell line panel, and only the most active compounds (17, 21, 24, 26, 27) were evaluated on a panel of 60 human tumor cell lines. Compound 21 was the most active against all cell lines with log GI50 equal to -5.49 and log LC50 equal to -4.19 and maintained significant percent of growth inhibition on seven cancer cell lines at the concentration of 1 μM. Compound 17 was the second most active and moreover showed interesting selectivity against some cell lines (Lung cancer: A549/ATCC, Melanoma: UACC-257, Ovarian Cancer: ovcar-8 and Renal cancer: RXF 393) at all concentration examined (100-0.01 μM).
- Piras, Sandra,Carta, Antonio,Briguglio, Irene,Corona, Paola,Paglietti, Giuseppe,Luciani, Rosaria,Costi, Maria Paola,Ferrari, Stefania
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p. 169 - 183
(2014/03/21)
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- Synthesis of Novel Quinolone-Chemotherapeutics. V. Methodical Investigations on the Synthesis of Quinolone Chemotherapeutics
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The synthesis of 6,7-dihalogen-N-ethyl-4-oxo-1,4-dihydroquinoline-3-carboxylic acids (3a,b) from 3,4-dihalogen-anilines is a three-step processes: (a) N-ethylation, (b) reaction with orthoformic ester and Meldrum's acid, (c) intramolecular cyclization.An increase of the total yields in comparison with known methods is mainly connected with the third step.Here the Meldrum's method allows reactions in solution at temperatures 100 deg C.With application of special Lewis acids the 6,7-dihalogen-substituted products are formed in relatively high yields (6,7-difluoro-1-ethyl-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid (3a): 71percent; 7-chloro-6-fluoro-1-ethyl-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid (3b): 60percent) without impurities of the corresponding 5,6-dihalogen substituted isomers.Anhydrides (5) of 4-oxo-1,4-dihydro-quinolone-3-carboxylic acids with dibromo- and difluoro-boric acid were synthesized and shown to facilitate the aromatic nucleophilic substitution.The kinetics of two reactions (5a -> 6 and 3b -> 7) were determined and relative reaction rates established.
- Jordis, Ulrich,Sauter, Fritz,Burkart, Michael,Henning, Hans-Georg,Gelbin, Anke
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p. 267 - 279
(2007/10/02)
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