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Substituted N-Phenylpyrazine-2-carboxamides: Synthesis and Antimycobacterial Evaluation  [PDF]
Martin Dole?al,Jan Zitko,Diana Ke?etovi?ová,Ji?í Kune?,Michaela Svobodová
Molecules , 2009, DOI: 10.3390/molecules14104180
Abstract: The condensation of chlorides of substituted pyrazinecarboxylic acids with ringsubstituted anilines yielded twelve substituted pyrazinecarboxylic acid amides. The synthetic approach, analytical, and lipophilicity data of the newly synthesized compounds are presented. Two antituberculosis assays were used. Firstly, the antimycobacterial activity against four different Mycobacterium strains in a series of pyrazine derivatives was investigated. Secondly, the antimycobacterial evaluation was performed at the Tuberculosis Antimicrobial Acquisition and Coordinating Facility (TAACF) program. Interesting in vitro antimycobacterial activity was found, N-(3-iodo-4-methylphenyl) pyrazine-2-carboxamide (9) was most active derivative compound against M. tuberculosis (MIC < 2.0 μmol/L), while another iodo derivative 5-tert-butyl-6-chloro-N-(3-iodo-4-methyl-phenyl)pyrazine-2-carboxamide (12) was the most active compound in the TAACF antituberculosis screening program (IC90 = 0.819 μg/mL).
Synthesis and antiproliferative activity of novel limonene derivatives with a substituted thiourea moiety
Figueiredo, Isis M.;Santos, Luciane V. dos;Costa, Willian F. da;Carvalho, Jo?o E. de;Silva, Cleuza C. da;Sacoman, Juliana L.;Kohn, Luciana K.;Sarragiotto, Maria H.;
Journal of the Brazilian Chemical Society , 2006, DOI: 10.1590/S0103-50532006000500020
Abstract: a series of r-(+)-limonene derivatives bearing a substituted thiourea moiety (3-13) and five s-methyl analogs (14-18) were synthesized and evaluated for their in vitro antiproliferative activity against human cancer cell lines. compounds bearing aromatic substituents (3-6) exhibit cytotastic activity in the full panel of cell lines tested, with gi50 values in the range of 2.5 to 24 μmol l-1. compounds 3, 10, 12 and 16 were the most active with gi50 values in the range of 0.41 to 3.0 μmol l-1, against different cell lines.
Synthesis, in Vitro Antimycobacterial and Antibacterial Evaluation of IMB-070593 Derivatives Containing a Substituted Benzyloxime Moiety  [PDF]
Zengquan Wei,Jian Wang,Mingliang Liu,Sujie Li,Lanying Sun,Huiyuan Guo,Bin Wang,Yu Lu
Molecules , 2013, DOI: 10.3390/molecules18043872
Abstract: A series of novel IMB-070593 derivatives containing a substituted benzyloxime moiety and displaying a remarkable improvement in lipophilicity were synthesized and evaluated for their in vitro antimycobacterial and antibacterial activity. Our results reveal that the target compounds 19a– m have considerable Gram-positive activity (MIC: <0.008–32 μg/mL), although they are generally less active than the reference drugs against the Gram-negative strains. In particular, compounds 19h, 19j, 19k and 19m show good activity (MICs: <0.008–4 μg/mL) against all of the tested Gram-positive strains, including ciprofloxacin (CPFX)- and/or levofloxacin (LVFX)-resistant MSSA, MRSA and MSSE. Moreover, compound 19l (MIC: 0.125 μg/mL) is found to be 2–4 fold more active than the parent IMB070593, CPFX and LVFX against M. tuberculosis H37Rv ATCC 27294.
Synthesis, Half-Wave Potentials and Antiproliferative Activity of 1-Aryl-substituted Aminoisoquinolinequinones  [PDF]
Juana Andrea Ibacache,Virginia Delgado,Julio Benites,Cristina Theoduloz,Verónica Arancibia,Giulio G. Muccioli,Jaime A. Valderrama
Molecules , 2014, DOI: 10.3390/molecules19010726
Abstract: The synthesis of a variety of 1-aryl-7-phenylaminoisoquinolinequinones from 1,4-benzoquinone and arylaldehydes via the respective 1-arylisoquinolinequinones is reported. The cyclic voltammograms of the new compounds exhibit two one-electron reduction waves to the corresponding radical-anion and dianion and two quasi-reversible oxidation peaks. The half-wave potential values (E I ?) of the members of the series have proven sensitive to the electron-donor effect of the aryl group (phenyl, 2-thienyl, 2-furyl) at the 1-position as well as to the phenylamino groups (anilino, p-anisidino) at the 7-position. The antiproliferative activity of the new compounds was evaluated in vitro using the MTT colorimetric method against one normal cell line (MRC-5 lung fibroblasts) and two human cancer cell lines: AGS human gastric adenocarcinoma and HL-60 human promyelocytic leukemia cells in 72-h drug exposure assays. Among the series, compounds 5a, 5b, 5g, 5h, 6a and 6d exhibited interesting antiproliferative activities against human gastric adenocarcinoma. The 1-arylisoquinolinequinone 6a was found to be the most promising active compound against the tested cancer cell lines in terms of IC50 values (1.19; 1.24 μM) and selectivity index (IS: 3.08; 2.96), respect to the anti-cancer agent etoposide used as reference (IS: 0.57; 0.14).
Pharmacophore modeling and 3D-QSAR studies on substituted benzothiazole / benzimidazole analogues as DHFR inhibitors with antimycobacterial activity  [PDF]
R. Priyadarsini,Dr. C.B. Tharani,Sathya Suganya,S.Kavitha
International Journal of Pharma Sciences and Research , 2012,
Abstract: The resurgence of tuberculosis and the emergence of multidrug-resistant strains of Mycobacteria drugs has propelled the development of new structural classes of antitubercular agents. The present study was undertaken to investigate the opportunities which the enzyme dihydrofolate reductase, a promising drug target for treatmentof Mycobacterial infections offers for the development of new TB drugs. Pharmacophore models were established by using the HipHop and HypoGen algorithms implemented in the Catalyst software package. Thebest quantitative pharmacophore model, consisted of two hydrogen bond acceptor, a hydrophobic aliphatic, and a ring aromatic feature which has the highest correlation coefficient (0.93), as well as enrichment factor of 1.75 and Goodness of hit score of 0.73. Based on the pharmacophore model some leads were optimized and some of its derivatives were synthesized and analysed by following QSAR studies. About 25 compounds of substituted benzothiazole/ benzimidazole derivatives were synthesized as potent DHFR inhibitors and screened for antimycobacterial activity. To further explore the structure-activity relationships of all newly synthesized compounds, 3D-QSAR analyses were developed. MFA studies were performed with the QSAR module of Cerius2 using genetic partial least squares (G/PLS) algorithm. The predictive ability of the developed model was assessed using a training set of 25 and a test set of 5 compounds (r2pred = 0.924).The analyzed MF
7,8,15,16-tetraoxa-dispiro[5.2.5.2]hexadecane-3-carboxylic acid derivatives and their antimalarial activity
IGOR OPSENICA,NATASA TERZIC,DEJAN OPSENICA,WILBUR K. MILHOUS
Journal of the Serbian Chemical Society , 2004,
Abstract: Several C2 symmetrical mixed tetraoxanes were prepared starting from a gemdihydroperoxide and a ketone. The obtained tetraoxanes showed pronounced antimalarial activity against P. falciparum chloroquine resistant W2 and chloroquine susceptible D6 strains, with N-(2-dimethylamino)ethyl-7,8,15,16-tetraoxa-dispiro[5.2.5.2] hexadecane-3-carboxamide being as active as artemisinin.
Antimycobacterial Activity of Salicylanilide Benzenesulfonates  [PDF]
Martin Krátky,Jarmila Vin?ová,Nabila Guisado Rodriguez,Ji?ina Stola?íková
Molecules , 2012, DOI: 10.3390/molecules17010492
Abstract: A series of eighteen novel esters of salicylanilides with benzenesulfonic acid were designed, synthesized and characterized by IR, 1H-NMR and 13C-NMR. They were evaluated in vitro as potential antimycobacterial agents towards Mycobacterium tuberculosis, Mycobacterium avium and two strains of Mycobacterium kansasii. In general, the minimum inhibitory concentrations range from 1 to 500 μmol/L. The most active compound against M. tuberculosis was 4-chloro-2-(4-(trifluoromethyl)phenylcarbamoyl)-phenyl benzenesulfonate, with MIC of 1 μmol/L and towards M. kansasii its isomer 5-chloro-2-(4-(trifluoromethyl)phenylcarbamoyl)phenyl benzenesulfonate (MIC of 2–4 μmol/L). M. avium was the less susceptible strain. However, generally, salicylanilide benzenesulfonates did not surpass the activity of other salicylanilide esters with carboxylic acids.
Design, Synthesis and Antiproliferative Activity of Novel 2-Substituted-4-amino-6-halogenquinolines  [PDF]
Nan Jiang,Xin Zhai,Ting Li,Difa Liu,Tingting Zhang,Bin Wang,Ping Gong
Molecules , 2012, DOI: 10.3390/molecules17055870
Abstract: Two series of novel 2-substituted-4-amino-6-halogenquinolines 8a–l and 13a–h were designed, synthesized and evaluated for their antiproliferative activity against H-460, HT-29, HepG2 and SGC-7901 cancer cell lines in vitro. The pharmacological results indicated that most compounds with 2-arylvinyl substituents exhibited good to excellent antiproliferative activity. Among them, compound 8e was a considered promising lead for further structural modifications with IC50 values of 0.03 μM, 0.55 μM, 0.33 μM and 1.24 μM, which was 2.5- to 186-fold more active than gefitinib and compound 1.
Structure-activity relationships of 3-substituted-5,5- diphenylhydantoins as potential antiproliferative and antimicrobial agents  [PDF]
Tri?ovi? Nemanja,Bo?i? Bojan,Obradovi? Ana,Stefanovi? Olgica
Journal of the Serbian Chemical Society , 2011, DOI: 10.2298/jsc110314143t
Abstract: A series of twelve 3-substituted-5,5-diphenylhydantoins was synthesized, including some whose anticonvulsant activities have already been reported in the literature. Their antiproliferative activities against HCT-116 human colon carcinoma cells were evaluated to determine structure-activity relationships. Almost all of the compounds exhibited statistically significant antiproliferative effects at a concentration of 100 μM, while the derivative bearing a benzyl group was active even at lower concentrations. Moreover, their in vitro antibacterial activities against Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923 and clinical isolates of Escherichia coli, Proteus mirabilis, Pseudomonas aeruginosa, Enterococcus faecalis and Staphylococcus aureus were evaluated. Only the 3-iso-propyl and 3-benzyl derivatives showed weak antibacterial activities against the Gram-positive bacterium E. faecalis and the Gram-negative bacteria E. coli ATCC 25922 and E. coli.
1,2,3-Triazole-Substituted Oleanolic Acid Derivatives: Synthesis and Antiproliferative Activity  [PDF]
Mariano Walter Pertino,Cecilia Lopez,Cristina Theoduloz,Guillermo Schmeda-Hirschmann
Molecules , 2013, DOI: 10.3390/molecules18077661
Abstract: Hybrid compounds are relevant products when searching for structure-activity relationships of natural products. Starting from the naturally occurring triterpene oleanolic acid, alkyl esters were prepared and treated with different aromatic azides using click chemistry to produce hybrid compounds. Some 18 new oleanolic acid derivatives were synthesized and the structures were confirmed by spectroscopic and spectrometric means. The antiproliferative activity of the new derivatives was evaluated towards normal lung fibroblasts (MRC-5), gastric epithelial adenocarcinoma (AGS), promyelocytic leukemia (HL-60), lung cancer (SK-MES-1) and bladder carcinoma (J82) cells. The alkyne esters 1 and 3 showed activity on all cell lines but without selectivity (19.6–23.1 μM and 14.1–56.2 μ M, respectively), their respective methyl esters were inactive. Compounds with a benzene and p-anisole attached to the triazole ring, showed no antiproliferative effect. Introduction of a chlorine atom into the benzene ring (compound 9) elicited a selective effect against AGS cells (IC 50 value: 8.9 μM). The activity was lost when the COOH function at C-28 was methylated. Better antiproliferative effect was found for compounds 11 and 15 bearing a p-toluenesulphonyl group, with values in the range of 10.8–47.1 μM and 11.5–22.2 μM, respectively. The effect, however, was not associated with selectivity.
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