51
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Comparison of Multiple Linear Regressions and Neural Networks based QSAR models for the design of new antitubercular compounds. Eur J Med Chem 2013; 70:831-45. [PMID: 24246731 DOI: 10.1016/j.ejmech.2013.10.029] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Revised: 07/26/2013] [Accepted: 10/11/2013] [Indexed: 01/29/2023]
Abstract
The performance of two QSAR methodologies, namely Multiple Linear Regressions (MLR) and Neural Networks (NN), towards the modeling and prediction of antitubercular activity was evaluated and compared. A data set of 173 potentially active compounds belonging to the hydrazide family and represented by 96 descriptors was analyzed. Models were built with Multiple Linear Regressions (MLR), single Feed-Forward Neural Networks (FFNNs), ensembles of FFNNs and Associative Neural Networks (AsNNs) using four different data sets and different types of descriptors. The predictive ability of the different techniques used were assessed and discussed on the basis of different validation criteria and results show in general a better performance of AsNNs in terms of learning ability and prediction of antitubercular behaviors when compared with all other methods. MLR have, however, the advantage of pinpointing the most relevant molecular characteristics responsible for the behavior of these compounds against Mycobacterium tuberculosis. The best results for the larger data set (94 compounds in training set and 18 in test set) were obtained with AsNNs using seven descriptors (R(2) of 0.874 and RMSE of 0.437 against R(2) of 0.845 and RMSE of 0.472 in MLRs, for test set). Counter-Propagation Neural Networks (CPNNs) were trained with the same data sets and descriptors. From the scrutiny of the weight levels in each CPNN and the information retrieved from MLRs, a rational design of potentially active compounds was attempted. Two new compounds were synthesized and tested against M. tuberculosis showing an activity close to that predicted by the majority of the models.
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52
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Shyma P, Kalluraya B, Peethambar S, Telkar S, Arulmoli T. Synthesis, characterization and molecular docking studies of some new 1,3,4-oxadiazolines bearing 6-methylpyridine moiety for antimicrobial property. Eur J Med Chem 2013; 68:394-404. [DOI: 10.1016/j.ejmech.2013.07.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 07/25/2013] [Accepted: 07/27/2013] [Indexed: 11/24/2022]
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53
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2-{[5-(Diphenylmethyl)-1,3,4-oxadiazol-2-yl]sulfanyl}-N-(pyrazin-2-yl)acetamide. MOLBANK 2013. [DOI: 10.3390/m800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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54
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Vankadari SR, Mandala D, Pochampalli J, Tigulla P, Valeru A, Thampu R. Synthesis, evaluation of antimicrobial activity, and molecular modeling of novel 2-((4-(2H-benzo[d] [1,2,3] triazol-2-yl)piperidin-1-yl)methyl)-5-substituted phenyl-1,3,4-oxadiazoles. Med Chem Res 2013. [DOI: 10.1007/s00044-013-0573-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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55
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Zou L, Mottweiler J, Priebbenow DL, Wang J, Stubenrauch JA, Bolm C. Mild Copper‐Mediated Direct Oxidative Cross‐Coupling of 1,3,4‐Oxadiazoles with Polyfluoroarenes by Using Dioxygen as Oxidant. Chemistry 2013; 19:3302-5. [DOI: 10.1002/chem.201204502] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Indexed: 12/25/2022]
Affiliation(s)
- Liang‐Hua Zou
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241‐8092391
| | - Jakob Mottweiler
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241‐8092391
| | - Daniel L. Priebbenow
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241‐8092391
| | - Jun Wang
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241‐8092391
| | - Jan Alexander Stubenrauch
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241‐8092391
| | - Carsten Bolm
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241‐8092391
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56
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Abdel Rahman DE. Synthesis, Quantitative Structure–Activity Relationship and Biological Evaluation of 1,3,4-Oxadiazole Derivatives Possessing Diphenylamine Moiety as Potential Anticancer Agents. Chem Pharm Bull (Tokyo) 2013; 61:151-9. [DOI: 10.1248/cpb.c12-00637] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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57
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Abstract
The search for small molecules with activity against Mycobacterium tuberculosis increasingly uses -high-throughput screening and computational methods. Previously, we have analyzed recent studies in which computational tools were used for cheminformatics. We have now updated this analysis to illustrate how they may assist in finding desirable leads for tuberculosis drug discovery. We provide our thoughts on strategies for drug discovery efforts for neglected diseases.
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Affiliation(s)
- Sean Ekins
- Collaborations in Chemistry, Fuquay Varina, NC, USA
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58
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Şahin ZS, Özkan İ, Köksal M, Işık Ş. 5-(3,4-dichlorophenyl)-3-{[4-(2-pyridyl)piperazine-1-yl]methyl}-1,3,4-oxadiazole-2(3H)-one: Synthesis, characterization, X-ray and DFT structures. J STRUCT CHEM+ 2012. [DOI: 10.1134/s0022476612050162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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59
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Macaev F. Selective Organic Synthesis for Sustainable Development. CHEMISTRY JOURNAL OF MOLDOVA 2012. [DOI: 10.19261/cjm.2012.07(2).12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The data on the development of selective organic synthesis suitable for obtaining multifunctional organic compounds both linear and cyclic structures using environmentally benign, inexpensive and renewable resources summarized. This article is an extended abstract of a communication presented at the Conference Ecological Chemistry 2012.
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60
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El-Sadek MM, Hassan SY, El-Dayem NSA, Yacout GA. 5-(5-Aryl-1,3,4-oxadiazole-2-carbonyl)furan-3-carboxylate and new cyclic C-glycoside analogues from carbohydrate precursors with MAO-B, antimicrobial and antifungal activities. Molecules 2012; 17:7010-27. [PMID: 22678415 PMCID: PMC6268659 DOI: 10.3390/molecules17067010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2012] [Revised: 04/27/2012] [Accepted: 05/09/2012] [Indexed: 11/23/2022] Open
Abstract
Cyclization of acyclic C-glycoside derivatives 1a,b to 2a,b as the major isomers, and 4a,b as the minor isomers were carried out. The isopropylidene derivatives 3a,b were prepared, as well as the hydrazide derivative 6, which was condensed with a variety of aldehydes to give hydrazones 7a–e which were also prepared from the compounds 12a–e. Acetylation of 7a,d gave the corresponding acetyl derivatives 8a,d, respectively. In addition, the dicarbonyl compound 9 was prepared in the hydrate form, which reacted with a number of aroylhydrazines to give the corresponding bisaroyl-hydrazones 10a–d, which were cyclized into 1,3,4-oxadiazoles 11a–d. Furthermore, two of the prepared compounds were examined to show the ability to activate MAO-B. In addition a number of prepared compounds showed antibacterial and antiviral activities.
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Affiliation(s)
- Mohamed Mohamed El-Sadek
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria 21231, Egypt; (S.Y.H.); (N.S.A.E.-D.)
- Author to whom correspondence should be addressed; ; Tel.: +20-01-006-544-617; Fax: +20-3-593-2488
| | - Seham Yassen Hassan
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria 21231, Egypt; (S.Y.H.); (N.S.A.E.-D.)
| | - Nagwa Said Abd El-Dayem
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria 21231, Egypt; (S.Y.H.); (N.S.A.E.-D.)
| | - Galila Ahmed Yacout
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria 21231, Egypt;
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61
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Kerimov İ, Ayhan-Kilcigil G, Özdamar ED, Can-Eke B, Çoban T, Özbey S, Kazak C. Design and one-pot and microwave-assisted synthesis of 2-amino/5-aryl-1,3,4-oxadiazoles bearing a benzimidazole moiety as antioxidants. Arch Pharm (Weinheim) 2012; 345:549-56. [PMID: 22467524 DOI: 10.1002/ardp.201100440] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Revised: 01/19/2012] [Accepted: 02/16/2012] [Indexed: 11/09/2022]
Abstract
In this study, two new series of 2-amino-1,3,4-oxadiazoles and 5-aryl-1,3,4-oxadiazoles carrying a benzimidazole moiety were synthesized. The antioxidant properties of these compounds were investigated in vitro by the determination of the microsomal NADPH-dependent inhibition of lipid peroxidation levels (LP), the microsomal ethoxyresorufin O-deethylase activity (EROD), and DPPH radical scavenger effects. Among the tested compounds, 2-[(2-(4-chlorophenyl)-1H-benzo[d]imidazole-1-yl)methyl]-5-(4-fluorophenyl)-1,3,4-oxadiazole (9) was found to be the most active compound in all three in vitro systems.
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Affiliation(s)
- İlgar Kerimov
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Ankara University, Ankara, Turkey
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62
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El-Emam AA, Alrashood KA, Al-Omar MA, Al-Tamimi AMS. Synthesis and antimicrobial activity of N'-heteroarylidene-1-adamantylcarbohydrazides and (±)-2-(1-adamantyl)-4-acetyl-5-[5-(4-substituted phenyl-3-isoxazolyl)]-1,3,4-oxadiazolines. Molecules 2012; 17:3475-83. [PMID: 22426528 PMCID: PMC6268319 DOI: 10.3390/molecules17033475] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 02/16/2012] [Accepted: 03/06/2012] [Indexed: 11/16/2022] Open
Abstract
The reaction of adamantane-1-carbohydrazide (1) with heterocyclic aldehydes, namely 5-(4-chlorophenyl)isoxazole-3-carboxaldehyde (2a), 5-(4-methylphenyl)isoxazole-3-carboxaldehyde (2b), 5-(4-methoxyphenyl)isoxazole-3-carboxaldehyde (2c), 1H-imidazole-2-carboxaldehyde and 2-butyl-4-chloro-1H-imidazole-5-carboxaldehyde, in ethanol, yielded the corresponding N'-heteroarylidene-1-adamantylcarbohydrazides 3a, 3b, 3c, 4 and 5, respectively, in good yields. The 4-acetyl-1,3,4-oxadiazoline analogues 6a‑c were prepared in 48-55% yields by heating their corresponding N'-heteroarylidene-1-adamantylcarbohydrazides 3a-c with acetic anhydride for two hours. Compounds 3a-c, 4, 5 and 6a-c were tested for in vitro activities against a panel of Gram-positive and Gram-negative bacteria and the yeast-like pathogenic fungus Candida albicans. Compounds 4 and 5 displayed potent broad-spectrum antimicrobial activity, while compounds 3a-c showed good activity against the Gram-positive bacteria.
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Affiliation(s)
- Ali A El-Emam
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia.
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63
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Nikoo A, Dilmaghani KA. Synthesis of 1,2,4,5-Tetrakis(1,2,4-Triazolyl) Benzene and 1,2,4,5-Tetrakis(1,3,4-Oxadiazolyl) Benzene Derivatives. PHOSPHORUS SULFUR 2012. [DOI: 10.1080/10426507.2011.597801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Abbas Nikoo
- a Department of Chemistry, Faculty of Science , Urmia University , Urmia , Iran
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64
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Zou LH, Reball J, Mottweiler J, Bolm C. Transition metal-free direct C–H bond thiolation of 1,3,4-oxadiazoles and related heteroarenes. Chem Commun (Camb) 2012; 48:11307-9. [DOI: 10.1039/c2cc36711d] [Citation(s) in RCA: 135] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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65
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Study of binary systems of β-cyclodextrin with a highly potential anti-mycobacterial drug. J INCL PHENOM MACRO 2011. [DOI: 10.1007/s10847-011-0091-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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66
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Synthesis, molecular modeling and biological evaluation of 2-(benzylthio)-5-aryloxadiazole derivatives as anti-tumor agents. Eur J Med Chem 2011; 47:473-8. [PMID: 22119130 DOI: 10.1016/j.ejmech.2011.11.015] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Revised: 11/09/2011] [Accepted: 11/09/2011] [Indexed: 11/21/2022]
Abstract
A series of 2-(benzylthio)-5-aryloxadiazole derivatives have been designed and synthesized, and their biological activities are also evaluated for EGFR inhibitory activity. Fourteen compounds among the twenty compounds are reported for the first time. Their chemical structures are characterized by (1)H NMR, MS, and elemental analysis. Anti-proliferative and EGFR inhibition assay results have demonstrated that compound 3e shows the most potent biological activity (IC(50) = 1.09 μM for MCF-7 and IC(50) = 1.51 μM for EGFR). Docking simulation has been performed to position compound 3e into the EGFR active site to determine the probable binding model, with an estimated binding free energy value of -10.7 kcal/mol. Compound 3e with potent inhibitory activity in tumor growth inhibition may be a promising anti-tumor leading compound for the further research.
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67
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Macaev F, Ribkovskaia Z, Pogrebnoi S, Boldescu V, Rusu G, Shvets N, Dimoglo A, Geronikaki A, Reynolds R. The structure–antituberculosis activity relationships study in a series of 5-aryl-2-thio-1,3,4-oxadiazole derivatives. Bioorg Med Chem 2011; 19:6792-807. [DOI: 10.1016/j.bmc.2011.09.038] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Revised: 09/11/2011] [Accepted: 09/21/2011] [Indexed: 11/28/2022]
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68
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Jorge SD, Palace-Berl F, Masunari A, Cechinel CA, Ishii M, Pasqualoto KFM, Tavares LC. Novel benzofuroxan derivatives against multidrug-resistant Staphylococcus aureus strains: Design using Topliss’ decision tree, synthesis and biological assay. Bioorg Med Chem 2011; 19:5031-8. [DOI: 10.1016/j.bmc.2011.06.034] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 06/08/2011] [Accepted: 06/12/2011] [Indexed: 11/17/2022]
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69
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Ribkovskaia Z, Pogrebnoi S, Barba A, Macaev F. Synthesis and Characterization of [(5-Mercapto-1,3,4-Oxadiazol-2-YL)Aryl]-3,5-Diaryl-4,5-Dihydro-1H-Pyrazole-1-Carbothioamides. CHEMISTRY JOURNAL OF MOLDOVA 2011. [DOI: 10.19261/cjm.2011.06(1).04] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The synthesis and characterization of [(5-mercapto-1,3,4-oxadiazol-2-yl)aryl]-3,5-diaryl-4,5-dihydro-1Hpyrazole-1-carbothioamides - derivatives of pyrazolines and 5-[4(3)-isothiocyanatophenyl]-2-thio-1,3,4-oxadiazoles were realized. The synthesized compounds, are crystalline substances, stable in storage and when exposed to air and light.
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70
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Akhter M, Akhter N, Alam MM, Zaman MS, Saha R, Kumar A. Synthesis and biological evaluation of 2,5-disubstituted 1,3,4-oxadiazole derivatives with both COX and LOX inhibitory activity. J Enzyme Inhib Med Chem 2011; 26:767-76. [PMID: 21314246 DOI: 10.3109/14756366.2010.550890] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Dual cyclooxygenase/lipoxygenase (COX/LOX) inhibitors constitute a valuable alternative to classical nonsteroidal anti-inflammatory drugs (NSAIDs) and selective COX-2 inhibitors for the treatment of inflammatory diseases. A series of 3-(5-phenyl/phenylamino-[1,3,4]oxadiazol-2-yl)-chromen-2-one and N-[5-(2-oxo-2H-chromen-3-yl)-[1,3,4]oxadiazol-2-yl]-benzamide derivatives were synthesized and screened for anti-inflammatory, analgesic activity. All the derivatives prepared are active in inhibiting oedema induced by carrageenan. Compound 4e was found more potent with 89% of inhibition followed by compound 4b (86%). Compounds with >70% of anti-inflammatory activity were tested for analgesic, ulcerogenic, and lipid peroxidation profile. Selected compounds were also evaluated for inhibition of COXs (COX-1 and COX-2) and LOXs (LOX-5, LOX-12, and LOX-15). Compound 4e was comparatively selective for COX-2, LOX-5, and LOX-15. Study revealed that these derivatives were more effective than ibuprofen with reduced side effects. It can be suggested that these derivatives could be used to develop more potent and safer NSAIDs.
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Affiliation(s)
- Mymoona Akhter
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Jamia Hamdard University, New Delhi, India.
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71
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Chitre TS, Panda S, Patil SM, Chothe AS, Vignesh G, Kathiravan MK. Novel 1,3,4-(thiadiazol-2-ylamino) methyl-5-(pyridin-4-yl)-1,3,4-oxadiazol-2-thiones: synthesis, docking and antimycobacterial testing. ACTA ACUST UNITED AC 2011. [DOI: 10.4236/abc.2011.12002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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72
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Ekins S, Freundlich JS, Choi I, Sarker M, Talcott C. Computational databases, pathway and cheminformatics tools for tuberculosis drug discovery. Trends Microbiol 2010; 19:65-74. [PMID: 21129975 DOI: 10.1016/j.tim.2010.10.005] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 10/15/2010] [Accepted: 10/29/2010] [Indexed: 01/31/2023]
Abstract
We are witnessing the growing menace of both increasing cases of drug-sensitive and drug-resistant Mycobacterium tuberculosis strains and the challenge to produce the first new tuberculosis (TB) drug in well over 40 years. The TB community, having invested in extensive high-throughput screening efforts, is faced with the question of how to optimally leverage these data to move from a hit to a lead to a clinical candidate and potentially, a new drug. Complementing this approach, yet conducted on a much smaller scale, cheminformatic techniques have been leveraged and are examined in this review. We suggest that these computational approaches should be optimally integrated within a workflow with experimental approaches to accelerate TB drug discovery.
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Affiliation(s)
- Sean Ekins
- Collaborations in Chemistry, 601 Runnymede Avenue, Jenkintown, PA 19046, USA.
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73
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Turta C, Melnic S, Prodius D, Macaev F, Stoeckli-Evans H, Ruiz P, Muraviev D, Pogrebnoi S, Ribkovskaia Z, Mereacre V, Lan Y, Powell AK. Sunflower oil coating on the nanoparticles of iron(III) oxides. INORG CHEM COMMUN 2010. [DOI: 10.1016/j.inoche.2010.07.046] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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74
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Manjunatha K, Poojary B, Lobo PL, Fernandes J, Kumari NS. Synthesis and biological evaluation of some 1,3,4-oxadiazole derivatives. Eur J Med Chem 2010; 45:5225-33. [DOI: 10.1016/j.ejmech.2010.08.039] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Revised: 08/12/2010] [Accepted: 08/16/2010] [Indexed: 12/31/2022]
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75
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Zou H, Wu H, Zhang X, Zhao Y, Stöckigt J, Lou Y, Yu Y. Synthesis, biological evaluation, and structure–activity relationship study of novel cytotoxic aza-caffeic acid derivatives. Bioorg Med Chem 2010; 18:6351-9. [DOI: 10.1016/j.bmc.2010.07.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 07/07/2010] [Accepted: 07/08/2010] [Indexed: 10/19/2022]
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76
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Patel NB, Patel JC. Synthesis and antimicrobial activity of 3-(1,3,4-Oxadiazol-2-yl)quinazolin-4(3H)-ones. Sci Pharm 2010; 78:171-93. [PMID: 21179342 PMCID: PMC3002796 DOI: 10.3797/scipharm.0912-16] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Accepted: 04/26/2010] [Indexed: 11/22/2022] Open
Abstract
In attempt to find new pharmacologically active molecules, we report here the synthesis and in vitro antimicrobial activity of various 3-(1,3,4-oxadiazol-2-yl)-quinazolin-4(3H)-ones. The antimicrobial activity of title compounds were examined against two gram positive bacteria (S. aureus, S. pyogenes), two gram negative bacteria (E. coli, P. aeruginosa) and three fungi (C. albicans, A. niger, A. clavatus) using the broth microdilution method. Some derivatives bearing a bromo or iodo group exhibited very good antimicrobial activity.
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Affiliation(s)
- Navin B Patel
- Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, Gujarat, India.
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77
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Padmavathi V, Reddy SN, Mahesh K. Synthesis, antimicrobial and antioxidant activities of sulfone linked bis heterocycles-pyrazolyl oxadiazoles and pyrazolyl thiadiazole. Chem Pharm Bull (Tokyo) 2010; 57:1376-80. [PMID: 19952447 DOI: 10.1248/cpb.57.1376] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A new class of bis heterocycles-sulfone linked pyrazolyl oxadiazoles and thiadiazoles were developed from Z-styrylsulfonylacetic acid. The pyrazolyl thiadiazoles exhibited excellent antimicrobial activity whereas pyrazolyl oxadiazoles displayed good antioxidant activity.
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78
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Akhtar T, Hameed S, Khan KM, Khan A, Choudhary MI. Design, synthesis, and urease inhibition studies of some 1,3,4-oxadiazoles and 1,2,4-triazoles derived from mandelic acid. J Enzyme Inhib Med Chem 2010; 25:572-6. [PMID: 20235688 DOI: 10.3109/14756360903389864] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Tashfeen Akhtar
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
| | - Shahid Hameed
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
| | - Khalid M. Khan
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
| | - Ajmal Khan
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
| | - Muhammad Iqbal Choudhary
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, Pakistan
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79
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Shingalapur RV, Hosamani KM, Keri RS, Hugar MH. Derivatives of benzimidazole pharmacophore: synthesis, anticonvulsant, antidiabetic and DNA cleavage studies. Eur J Med Chem 2010; 45:1753-9. [PMID: 20122763 DOI: 10.1016/j.ejmech.2010.01.007] [Citation(s) in RCA: 138] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Revised: 01/04/2010] [Accepted: 01/06/2010] [Indexed: 10/20/2022]
Abstract
In seeking broad spectrum pharmacological activities of benzimidazole derivatives, a group of 4-thiazolidinones 5(a-j) and 1,3,4-oxadiazoles 6(a-j) containing 2-mercapto benzimidazole moiety were synthesized and screened for in vivo anticonvulsant activity by Maximal Electroshock (MES) model and antidiabetic activity using Oral Glucose Tolerance Test (OGTT). Compounds (5c), (5d), (5g) and (5i) exhibited potent anticonvulsant results and (6c), (6d), (6h) and (6i) showed excellent antidiabetic activities and also pharmacophore derived from active molecules suggested that presence of -OH group was a common feature in all active compounds. In DNA cleavage studies, compound (5d) cleaved DNA completely as no trace of DNA was found. On the other hand, a sharp streak was found for compounds (5c), (6a) and (6d).
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Affiliation(s)
- Ramya V Shingalapur
- P.G. Department of Studies in Chemistry, Karnatak University, Pavate Nagar, Dharwad-580 003, Karnataka, India
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80
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Westwood IM, Bhakta S, Russell AJ, Fullam E, Anderton MC, Kawamura A, Mulvaney AW, Vickers RJ, Bhowruth V, Besra GS, Lalvani A, Davies SG, Sim E. Identification of arylamine N-acetyltransferase inhibitors as an approach towards novel anti-tuberculars. Protein Cell 2010; 1:82-95. [PMID: 21204000 PMCID: PMC4875111 DOI: 10.1007/s13238-010-0006-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Accepted: 11/03/2009] [Indexed: 01/04/2023] Open
Abstract
New anti-tubercular drugs and drug targets are urgently needed to reduce the time for treatment and also to identify agents that will be effective against Mycobacterium tuberculosis persisting intracellularly. Mycobacteria have a unique cell wall. Deletion of the gene for arylamine N-acetyltransferase (NAT) decreases mycobacterial cell wall lipids, particularly the distinctive mycolates, and also increases antibiotic susceptibility and killing within macrophage of Mycobacterium bovis BCG. The nat gene and its associated gene cluster are almost identical in sequence in M. bovis BCG and M. tuberculosis. The gene cluster is essential for intracellular survival of mycobacteria. We have therefore used pure NAT protein for high-throughput screening to identify several classes of small molecules that inhibit NAT activity. Here, we characterize one class of such molecules-triazoles-in relation to its effects on the target enzyme and on both M. bovis BCG and M. tuberculosis. The most potent triazole mimics the effects of deletion of the nat gene on growth, lipid disruption and intracellular survival. We also present the structure-activity relationship between NAT inhibition and effects on mycobacterial growth, and use ligand-protein analysis to give further insight into the structure-activity relationships. We conclude that screening a chemical library with NAT protein yields compounds that have high potential as anti-tubercular agents and that the inhibitors will allow further exploration of the biochemical pathway in which NAT is involved.
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Affiliation(s)
- Isaac M. Westwood
- Department of Pharmacology, University of Oxford, Oxford, OX1 3QT UK
- Chemistry Research Laboratory, Department of Organic Chemistry, University of Oxford, Oxford, OX1 3QL UK
| | - Sanjib Bhakta
- Department of Pharmacology, University of Oxford, Oxford, OX1 3QT UK
| | - Angela J. Russell
- Department of Pharmacology, University of Oxford, Oxford, OX1 3QT UK
- Chemistry Research Laboratory, Department of Organic Chemistry, University of Oxford, Oxford, OX1 3QL UK
| | - Elizabeth Fullam
- Department of Pharmacology, University of Oxford, Oxford, OX1 3QT UK
- Chemistry Research Laboratory, Department of Organic Chemistry, University of Oxford, Oxford, OX1 3QL UK
| | | | - Akane Kawamura
- Department of Pharmacology, University of Oxford, Oxford, OX1 3QT UK
- Chemistry Research Laboratory, Department of Organic Chemistry, University of Oxford, Oxford, OX1 3QL UK
| | - Andrew W. Mulvaney
- Chemistry Research Laboratory, Department of Organic Chemistry, University of Oxford, Oxford, OX1 3QL UK
| | - Richard J. Vickers
- Chemistry Research Laboratory, Department of Organic Chemistry, University of Oxford, Oxford, OX1 3QL UK
| | - Veemal Bhowruth
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT UK
| | - Gurdyal S. Besra
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT UK
| | - Ajit Lalvani
- Tuberculosis Immunology Group, Department of Respiratory Medicine, National Heart and Lung Institute, Wright Fleming Institute of Infection and Immunity, Imperial College London, Norfolk Place, London, W2 1PG UK
| | - Stephen G. Davies
- Chemistry Research Laboratory, Department of Organic Chemistry, University of Oxford, Oxford, OX1 3QL UK
| | - Edith Sim
- Department of Pharmacology, University of Oxford, Oxford, OX1 3QT UK
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81
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Yilmaz B, Göktürk M. Interactive data mining for molecular graphs. JOURNAL OF AUTOMATED METHODS & MANAGEMENT IN CHEMISTRY 2009; 2009:502527. [PMID: 20052387 PMCID: PMC2801005 DOI: 10.1155/2009/502527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Accepted: 10/02/2009] [Indexed: 05/28/2023]
Abstract
Designing new medical drugs for a specific disease requires extensive analysis of many molecules that have an activity for the disease. The main goal of these extensive analyses is to discover substructures (fragments) that account for the activity of these molecules. Once they are discovered, these fragments are used to understand the structure of new drugs and design new medicines for the disease. In this paper, we propose an interactive approach for visual molecule mining to discover fragments of molecules that are responsible for the desired activity with respect to a specific disease. Our approach visualizes molecular data in a form that can be interpreted by a human expert. Using a pipelining structure, it enables experts to contribute to the solution with their expertise at different levels. In order to derive desired fragments, it combines histogram-based filtering and clustering methods in a novel way. This combination enables a flexible determination of frequent fragments that repeat in molecules exactly or with some variations.
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Affiliation(s)
- Burcu Yilmaz
- Department of Computer Engineering, Gebze Institute of Technology, 10141400 Kocaeli, Turkey.
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82
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An Efficient Synthetic Route for New 1,3,4-Oxadiazoles Having Sulphonamido Pharmacophore. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.11.2812] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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83
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Liu J, Wang H, Zhang H, Wu X, Zhang H, Deng Y, Yang Z, Lei A. Identification of a Highly Efficient Alkylated Pincer Thioimido-Palladium(II) Complex as the Active Catalyst in Negishi Coupling. Chemistry 2009; 15:4437-45. [DOI: 10.1002/chem.200802238] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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84
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Kumar A, D'Souza SS, Nagaraj SRM, Gaonkar SL, Salimath BP, Rai KML. Antiangiogenic and antiproliferative effects of substituted-1,3,4-oxadiazole derivatives is mediated by down regulation of VEGF and inhibition of translocation of HIF-1alpha in Ehrlich ascites tumor cells. Cancer Chemother Pharmacol 2009; 64:1221-33. [PMID: 19370348 DOI: 10.1007/s00280-009-0992-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Accepted: 03/22/2009] [Indexed: 12/15/2022]
Abstract
PURPOSE 1,3,4-Oxadiazoles are an important class of heterocyclic compounds, which play a pivotal role in various pharmaceutical applications. Here, we investigated the antiangiogenic and antiproliferative effects of the derivatives and explored its mechanism of action on EAT cells. METHODS The cytotoxic effect of the derivatives on EAT and HEK293 cells was assessed by MTT assay. Effect of the derivatives on ALP activity and proliferation was measured. Swiss albino mice transplanted with EAT cells were used as a model system to study the effect of the derivatives in vivo. Inhibition of angiogenesis in mice peritoneum, CAM and Cornea of the rat were studied. Finally, the effects on VEGF gene expression, HIF-1alpha translocation and cell cycle arrest were determined. RESULTS The IC50 range for growth inhibition of EAT cells was found to be 140-175 microM. In contrast normal HEK293 cells were resistant to the derivatives at this range. Treatment with derivatives in vivo was demonstrated by the down regulation of VEGF in EAT cells and inhibition of blood vessels formation in mice peritoneum, CAM and cornea of rat, indicating the potent angioinhibitory effect of the derivatives. VEGF promoter-luciferase reporter gene expression analysis showed suppression of VEGF gene expression in vitro. The derivatives proved to be potent antiproliferative agents as shown by FACS analysis and decreased ALP activity. Furthermore, expression of HIF-1alpha was also down regulated by derivatives by repressing its nuclear translocation. CONCLUSIONS Oxadiazole derivatives are strong bioactive compounds with antiangiogenic and antiproliferative potential both in vitro and in vivo. We postulate that diminished HIF-1alpha nuclear presence in oxadiazole treated EAT cells could be responsible for decreased VEGF expression and antiangiogenic effects.
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Affiliation(s)
- Akhilesh Kumar
- Department of Studies in Biotechnology, University of Mysore, Manasagangotri, Mysore 570006, Karnataka, India
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85
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Liu XH, Shi YX, Ma Y, He GR, Dong WL, Zhang CY, Wang BL, Wang SH, Li BJ, Li ZM. Synthesis of SomeN,N′-Diacylhydrazine Derivatives with Radical-Scavenging and Antifungal Activity. Chem Biol Drug Des 2009; 73:320-7. [DOI: 10.1111/j.1747-0285.2009.00779.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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86
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Synthesis and Antituberculosis Activity of 4-aminobenzenesulfamido-2-thiazole 8-benzodioxane Azomethines. Pharm Chem J 2008. [DOI: 10.1007/s11094-008-0135-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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87
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Rostamizadeh S, Ghamkhar S. A mild and facile method for one pot synthesis of 2,5-di-substituted 1,3,4-oxadiazoles at room temperature. CHINESE CHEM LETT 2008. [DOI: 10.1016/j.cclet.2008.03.027] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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88
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Kumar A, D'Souza SS, Gaonkar SL, Rai KML, Salimath BP. Growth inhibition and induction of apoptosis in MCF-7 breast cancer cells by a new series of substituted-1,3,4-oxadiazole derivatives. Invest New Drugs 2008; 26:425-35. [PMID: 18227972 DOI: 10.1007/s10637-008-9116-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2007] [Accepted: 01/10/2008] [Indexed: 02/06/2023]
Abstract
The multiple pharmacological actions of unique synthetic compounds are a prerequisite for classifying a drug as highly efficacious, because the multiple pharmacological actions offer the possibility of treating various diseases like cancer. 1,3,4-Oxadiazoles are an important class of heterocyclic compounds with broad spectrum of biological activities. In this study we focused on the ability of these derivatives to induce apoptosis in cultured MCF-7 breast cancer cells. Treatment of MCF-7 cells with varying concentrations of the different derivatives resulted in dose and time dependent sequence of events marked by apoptosis, as shown by loss of cell viability, chromatin condensation, internucleosomal DNA fragmentation and sub G(0) phase accumulation. Furthermore, apoptosis in MCF-7 cell was induced by upregulation of proto-oncoprotein Bax and activation of Caspase-3 activated DNase. Although the derivatives induced apoptosis was associated with Bax protein levels, negligible Bcl-2 reduction was observed. Analysis of the data suggests that the substituted oxadiazole derivatives exert antiproliferative action and growth inhibition on MCF-7 cells through apoptosis induction and that it may have anticancer properties valuable for application in drug products.
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Affiliation(s)
- Akhilesh Kumar
- Department of Studies in Biotechnology, University of Mysore, Manasagangotri, Mysore, 570006, Karnataka, India
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89
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Karthikeyan MS, Prasad DJ, Mahalinga M, Holla BS, Kumari NS. Antimicrobial studies of 2,4-dichloro-5-fluorophenyl containing oxadiazoles. Eur J Med Chem 2008; 43:25-31. [PMID: 17521777 DOI: 10.1016/j.ejmech.2007.03.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2007] [Revised: 03/04/2007] [Accepted: 03/08/2007] [Indexed: 11/25/2022]
Abstract
A series of 2,4-dichloro-5-fluorophenyl containing 1,3,4-oxadiazoles (10 and 11) were synthesized by POCl3 cyclization of 2,4-dichloro-5-fluorobenzoyl hydrazide (4) and 2-(2,4-dichloro-5-fluorophenyl)cinchoninyl hydrazide (8) with aryloxyacetic acids (9). The structures of newly synthesized compounds were characterized by spectral and elemental analyses. All the compounds were screened for their antibacterial and antifungal activities. Compounds 10a, 10d and 11g showed very good antimicrobial activity. Compound 10d showed good bactericidal and fungicidal activities.
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90
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Mekuskiene G, Dodonova J, Burbuliene ΜM, Vainilavicius P. REACTIONS OF 5-(4,6-DIMETHYL-2-PYRIMIDINYL)-1,3,4- OXADIAZOLE-2(3H)-THIONE WITH N-NUCLEOPHILES. HETEROCYCL COMMUN 2007. [DOI: 10.1515/hc.2007.13.5.295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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91
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Abstract
Literature data on utilization of acetyl group of aryl-1-ethanones (acetophenones) for the synthesis of organic compounds is generalized. Different approaches of preparation of aromatic compounds by chemical transformations of methyl as well as keto- group of titled compounds are systematized. Examples of the synthesis of organic compounds based on products of primary transformations of aryl-1-ethanones are considered.
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92
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Kadi AA, El-Brollosy NR, Al-Deeb OA, Habib EE, Ibrahim TM, El-Emam AA. Synthesis, antimicrobial, and anti-inflammatory activities of novel 2-(1-adamantyl)-5-substituted-1,3,4-oxadiazoles and 2-(1-adamantylamino)-5-substituted-1,3,4-thiadiazoles. Eur J Med Chem 2006; 42:235-42. [PMID: 17129641 DOI: 10.1016/j.ejmech.2006.10.003] [Citation(s) in RCA: 198] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2006] [Revised: 10/02/2006] [Accepted: 10/05/2006] [Indexed: 12/01/2022]
Abstract
Reaction of 1-adamantanecarbonyl chloride with certain carboxylic acid hydrazides in pyridine yielded the corresponding N-acyl adamantane-1-carbohydrazide derivatives 3a-j, which were cyclized to the corresponding 2-(1-adamantyl)-5-substituted-1,3,4-oxadiazoles 4a-j via heating with phosphorus oxychloride. Treatment of 1-adamantylisothiocyanate with some carboxylic acid hydrazides in ethanol yielded the corresponding 1-acyl-4-(1-adamantyl)-3-thiosemicarbazides 7a-g, which were cyclized to the corresponding 2-(1-adamantylamino)-5-substituted-1,3,4-thiadiazole derivatives 8a-g. Compounds 4a-j, 7a-g, and 8a-g were tested for in vitro activities against a panel of Gram-positive and Gram-negative bacteria and the yeast-like pathogenic fungus Candida albicans. Several derivatives produced good or moderate activities particularly against the tested Gram-positive bacteria Bacillus subtilis. Meanwhile, compounds 4i and 8g displayed marked antifungal activity against C. albicans. In addition, the in vivo anti-inflammatory activity of the synthesized compounds was determined using the carrageenin-induced paw oedema method in rats. The oxadiazole derivatives 4c, 4g, 4i and 4j produced good dose-dependent anti-inflammatory activity.
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Affiliation(s)
- Adnan A Kadi
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
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93
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Hu YJ, Yu HG, Dong JX, Yang X, Liu Y. Spectroscopic studies on the interaction between 3,4,5-trimethoxybenzoic acid and bovine serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 65:988-92. [PMID: 16679051 DOI: 10.1016/j.saa.2006.02.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2005] [Accepted: 02/01/2006] [Indexed: 05/09/2023]
Abstract
The interaction between 3,4,5-trimethoxybenzoic acid (TMBA) and bovine serum albumin (BSA) was studied by fluorescence and UV-vis absorption spectroscopy. In the mechanism discussion, it was proved that the fluorescence quenching of BSA by TMBA is a result of the formation of TMBA-BSA complex. Quenching constants were determined using the Stern-Volmer equation to provide a measure of the binding affinity between TMBA and BSA. The thermodynamic parameters DeltaH, DeltaG, DeltaS at different temperatures were calculated, and electrostatic interactions play an important role to stabilize the complex. The distance r between donor (BSA) and acceptor (TMBA) was obtained according to fluorescence resonance energy transfer (FRET).
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Affiliation(s)
- Yan-Jun Hu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
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94
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Bedia KK, Elçin O, Seda U, Fatma K, Nathaly S, Sevim R, Dimoglo A. Synthesis and characterization of novel hydrazide-hydrazones and the study of their structure-antituberculosis activity. Eur J Med Chem 2006; 41:1253-61. [PMID: 16919372 DOI: 10.1016/j.ejmech.2006.06.009] [Citation(s) in RCA: 193] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2006] [Revised: 03/31/2006] [Accepted: 06/15/2006] [Indexed: 11/24/2022]
Abstract
A series of hydrazide-hydrazones, based on a series of 4-substituted benzoic acid, were synthesized, and their structures were elucidated and screened for the antituberculosis activity against Mycobacterium tuberculosis H37Rv with the help of the BACTEC 460 radiometric system. Compound 3, 4-fluorobenzoic acid [((5-nitro)thiophen-2yl) methylene]hydrazide showed the highest inhibitory activity in this series. The search of pharmacophores was done by means of the Electronic-Topological Method (ETM). The model developed in this study is supposed to be applied to the design, preparation and screening of new compounds of similar structure in order to further test and optimize the model with the eventual goal of preparing new anti-tubercular agents.
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Affiliation(s)
- Koçyiğit-Kaymakçioğlu Bedia
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Marmara University, Haydarpaşa 34668, Istanbul, Turkey.
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95
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Abdel-Rahman HM, Hussein MA. Synthesis of β-Hydroxypropanoic Acid Derivatives as Potential Anti-inflammatory, Analgesic and Antimicrobial Agents. Arch Pharm (Weinheim) 2006; 339:378-87. [PMID: 16783838 DOI: 10.1002/ardp.200600016] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A series of new 3-(substituted) 3-hydroxy-propanoic acid ethyl esters 1a-c, hydrazides 2a-c, thiosemicarbazides 3a-f, and semicarbazides 3g, 3h has been synthesized. Cyclization of compounds 3a-d in basic medium yielded 1,2,4-triazole-5-thiones 4a-d. On the other hand, reaction of hydrazides 2a-c with CS(2 )in basic medium afforded 1,3,4-oxadiazole-5-thiones 5a-c. All the synthesized compounds were characterized by their physical and spectral analyses data. The newly synthesized compounds were evaluated for their anti-inflammatory, analgesic, and antimicrobial activities. Compounds 1c, 3g, 4a, 4b, 4c, and 5c exhibited comparable anti-inflammatory activity to that of indomethacin and compounds 1c, 4c, and 5c were more analgesics than acetyl salicylic acid. Compounds 4b, 4c, and 5c showed superior GI safety profile (33.3%, 33.3% and 50.0% ulceration) than that of indomethacin (100% ulceration) at 100 mg/kg oral dose. Compounds 4b, 4c, and 5c were also non-toxic with a median lethal dose (LD(50)) up to 200 mg/kg. The antibacterial and antifungal screenings identified compounds 3c, 4b, 4d, 5a, and 5b as the most effective against a variety of tested microorganisms.
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Affiliation(s)
- Hamdy M Abdel-Rahman
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Assiut University, Assiut, Egypt.
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96
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Gaonkar SL, Rai KML, Prabhuswamy B. Synthesis and antimicrobial studies of a new series of 2-[4-[2-(5-ethylpyridin-2-yl)ethoxy]phenyl]-5-substituted-1,3,4-oxadiazoles. Eur J Med Chem 2006; 41:841-6. [PMID: 16616395 DOI: 10.1016/j.ejmech.2006.03.002] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 03/04/2006] [Accepted: 03/06/2006] [Indexed: 10/24/2022]
Abstract
A series of novel 2-[4-[2-(5-ethylpyridin-2-yl)ethoxy]phenyl]-5-substituted-1,3,4-oxadiazoles were synthesized by the oxidative cyclisation of hydrazones derived from 4-[2-(5-ethylpyridin-2-yl)ethoxy]benzaldehyde and aroylhydrazines using chloramine-T as oxidant. IR, NMR and elemental analysis characterized the newly synthesized compounds. The synthesized compounds were evaluated for their antimicrobial activity and were compared with standard drugs. The compounds demonstrated potent to weak antimicrobial activity. Out of the compounds studied, compounds 8c and 8d showed significant inhibition. Compounds 8b, 8f, 8k and 8e showed moderate activity. The minimum inhibitory concentration of the compounds was in the range of 8-26 microg ml(-1) against bacteria and 8-24 microg ml(-1) against fungi. The title compounds represent a novel class of potent antimicrobial agents.
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Affiliation(s)
- S L Gaonkar
- Department of Studies in Chemistry, University of Mysore, Manasagangotri, India.
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97
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Li Y, Liu J, Zhang H, Yang X, Liu Z. Stereoselective synthesis and fungicidal activities of (E)-α-(methoxyimino)-benzeneacetate derivatives containing 1,3,4-oxadiazole ring. Bioorg Med Chem Lett 2006; 16:2278-82. [PMID: 16455246 DOI: 10.1016/j.bmcl.2006.01.026] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2005] [Revised: 12/27/2005] [Accepted: 01/06/2006] [Indexed: 10/25/2022]
Abstract
Fifteen novel (E)-alpha-(methoxyimino)-benzeneacetate derivatives, the analogues of strobilurins, which contain two pharmacophoric substructures of (E)-methyl methoxyiminoacetate moiety and 1,3,4-oxadiazole ring were stereoselectively synthesized. It was first found that the coupling reaction could give stereoselectively the key intermediate (E) and (Z)-methyl 2-(hydroxyimino)-2-o-tolylacetate 2 with a ratio of 14:1. The preliminary bioassays indicated that all the compounds 1 showed potent fungicidal activity against Rhizoctonia solani, Botrytis cinereapers, Gibberella zeae, Physalospora piricola and Bipolaris mayclis, and all of the tested compounds 1a-1o had more potent fungicidal activities against R. solani than Kresoxim-methyl.
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Affiliation(s)
- Yan Li
- Key Laboratory of Synthesis and Application of Organic Functional Molecules of the Education Ministry, Hubei University, Wuhan, Hubei 430062,China.
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