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Molecular Diversity

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https://www.readbyqxmd.com/read/27904990/computer-modeling-in-predicting-the-bioactivity-of-human-5-lipoxygenase-inhibitors
#1
Mengdi Zhang, Zhonghua Xia, Aixia Yan
5-Lipoxygenase (5-LOX) is a key enzyme in the inflammatory path. Inhibitors of 5-LOX are useful for the treatment of diseases like arthritis, cancer, and asthma. We have collected a dataset including 220 human 5-LOX inhibitors for classification. A self-organizing map (SOM), a support vector machine (SVM), and a multilayer perceptron (MLP) algorithm were used to build models with selected descriptors for classifying 5-LOX inhibitors into active and weakly active ones. MACCS fingerprints were used in this model building process...
November 30, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27900513/synthesis-and-antimicrobial-evaluation-of-ester-linked-1-4-disubstituted-1-2-3-triazoles-with-a-furyl-thienyl-moiety
#2
C P Kaushik, Raj Luxmi, Dharmendra Singh, Ashwani Kumar
Twenty ester-linked 1,4-disubstituted 1,2,3-triazoles having a furyl/thienyl moiety have been synthesized from heteroaryl prop-2-yn-1-yl carboxylate and aromatic azides via a Cu(I) catalyzed 1,3-dipolar cycloaddition. All the synthesized compounds were characterized by FTIR, [Formula: see text]H NMR, [Formula: see text]C NMR spectroscopy and HRMS. Synthesized triazoles were tested in vitro for antimicrobial evaluation against Gram-negative bacteria-Escherichia coli, Enterobacter aerogenes and Klebsiella pneumoniae; Gram-positive bacteria-Staphylococcus aureus and two fungal strains-Candida albicans and Aspergillus niger, reflecting moderate to good activity...
November 29, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27858214/synthesis-and-biological-evaluation-of-n-3-oxo-3-4-dihydro-2h-benzo-b-1-4-oxazin-7-yl-benzenesulfonamide-derivatives-as-new-bet-bromodomain-inhibitors-for-anti-hematologic-malignancies-activities
#3
Li Liu, Yongxia Zhu, Zhihao Liu, Tinghong Ye, Weiqiong Zuo, Cuiting Peng, Kunjie Xiao, Ningyu Wang, Luoting Yu
The bromodomain and extra-terminal proteins (BETs), in particular BRD4, has been reported to play important roles in cancer, inflammation, obesity, cardiovascular disease, and neurological disorders. In this paper, a series of benzomorpholinone derivatives were synthesized and biologically evaluated as BETs inhibitors. Detailed structure-activity relationship studies led to the discovery of several new potent compounds, of which 15h and 15i displayed [Formula: see text] values of 2.8 and 4.5 [Formula: see text] against BRD4 (D1), respectively, and showed good anti-proliferation activities against four hematologic malignancies cell lines at low-micromolar concentrations, including MV4-11, OCI-LY10, Pfeifer, and Su-DHL-6 cells...
November 17, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27853977/a-facile-efficient-and-sustainable-chitosan-cahap-catalyst-and-one-pot-synthesis-of-novel-2-6-diamino-pyran-3-5-dicarbonitriles
#4
Suresh Maddila, Kranthi Kumar Gangu, Surya Narayana Maddila, Sreekantha B Jonnalagadda
A simple and versatile one-pot three-component synthetic protocol is devised for heterocycles, viz. 2,6-diamino-4-substituted-4H-pyran-3,5-dicarbonitrile derivatives, in short reaction times ([Formula: see text]30 min) at room temperature using ethanol as a solvent. This method involves the three-component reaction of malononitrile, substituted aldehydes, and cyanoacetamide catalyzed by chitosan-doped calcium hydroxyapatites (CS/CaHAps) giving good to excellent yields (86-96%). Twelve new pyran derivatives (4a-l) were synthesized and their structures were established and confirmed by different spectroscopic methods ([Formula: see text]H NMR, [Formula: see text]C NMR, [Formula: see text]N NMR, and HRMS)...
November 17, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27761763/synthesis-and-antibacterial-evaluation-of-new-n-and-s-glycosides-analogues-with-dinitrophenyl-substituted-heterocyclic-bases
#5
Fatima Belkhadem, Adil A Othman
Four N- and S-glycosides 13-16 having nucleobases 7-12 binding to sugar molecules from one side and to 3,5-dinitrophenyl moieties from another side were synthesized from 3,5-dinitrobenzoic acid 2. The synthetic intermediates, hydrazide 5 and thiosemicarbazide 6 regarded as important key compounds for the synthesis of nucleobases 7-12, each was obtained by two approaches. Structures of synthesized compounds were determined spectroscopically. Antibacterial activities for synthetic intermediates and glycosides were assessed using the paper disk diffusion method against Gram-negative bacteria: Pseudomonas aeruginosa, Pseudomonas fluorescens, and Escherichia coli and Gram-positive bacteria: Bacillus cereus and Staphylococcus aureus...
October 19, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27734189/molecular-topology-a-strategy-to-identify-novel-compounds-against-ulcerative-colitis
#6
María Gálvez-Llompart, Maria C Recio, Ramón García-Domenech, Jorge Gálvez
In the present paper, a strategy to identify novel compounds against ulcerative colitis (UC) by molecular topology (MT) is presented. Several quantitative structure-activity relationship (QSAR) models based on molecular topology have been developed to predict inducible nitric oxide synthase (iNOS) and tumor necrosis factor alpha ([Formula: see text]) mediated anti-ulcerative colitis (UC) activity and protective activity against a dextran sulfate sodium (DSS)-induced UC model. Each one has been used for the screening of four previously selected compounds as potential therapeutic agents for UC: alizarin-3-methyliminodiacetic acid (AMA), Calcein, (+)-dibenzyl-L-tartrate, and Ro 41-0960...
October 12, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27722985/qsar-models-of-antiproliferative-activity-of-imidazo-2-1-b-1-3-4-thiadiazoles-in-various-cancer-cell-lines
#7
Joanna Matysiak, Andrzej Niewiadomy
Imidazo[2,1-b][1,3,4]thiadiazoles have been recognized to possess antiproliferative potency towards a wide spectrum of cancer cell lines. QSAR investigations on a set of 42 di(tri)substituted imidazo[2,1-b][1,3,4]thiadiazoles were carried out to find the descriptors determining their biological potency. Three-variable equations were obtained by combinatorial protocols in multiple linear regression (CP MLR) for all three studied cancer cell lines. They showed that lipophilicity, electronic, and steric factors are decisive for the antiproliferative potency of compounds and indicate the important role of nitrogen atoms of imidazothiadiazole ring in the interactions with the molecular target...
October 8, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27677738/synthesis-of-amino-ester-embedded-benzimidazoles-a-one-pot-sequential-protocol-under-metal-free-neutral-conditions
#8
Priyabrata Roy, Chandan Bodhak, Animesh Pramanik
A one-pot three-component protocol has been developed for the synthesis of amino ester-embedded benzimidazoles under metal-free neutral conditions. Sequentially, the methodology involves coupling of an amino ester with 1-fluoro-2-nitrobenzene, reduction of the coupled nitroarene by sodium dithionite, and cyclization of the corresponding diamine with an aldehyde.
September 27, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27677737/a-versatile-strategy-for-the-design-and-synthesis-of-novel-adp-conjugates-and-their-evaluation-as-potential-poly-adp-ribose-polymerase-1-inhibitors
#9
Yuliya V Sherstyuk, Alexandra L Zakharenko, Mikhail M Kutuzov, Polina V Chalova, Maria V Sukhanova, Olga I Lavrik, Vladimir N Silnikov, Tatyana V Abramova
A versatile strategy for the synthesis of [Formula: see text] mimetics was developed, involving an efficient pyrophosphate linkage formation in key conjugates containing a functional amino group which acts as useful reactive anchor for further derivatization. These [Formula: see text] mimetics consist of ADP conjugated through a diphosphate chain to an extended aliphatic linker bearing an aromatic acid residue. A number of conjugates containing aromatic carboxylic acids were found to inhibit poly(ADP-ribose) synthesis catalyzed by poly(ADP-ribose) polymerase-1 (PARP-1)...
September 27, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27677736/novel-benzothiophene-1-1-dioxide-deoxygenation-path-for-the-microwave-assisted-synthesis-of-substituted-benzothiophene-fused-pyrrole-derivatives
#10
Hamza Karakuş, Yaşar Dürüst
The reaction of C-(4-substituted-phenyl)-N-(benzoyl)-N-methylglycines with benzo[b]thiophene 1,1-dioxide unexpectedly gave benzothiophene-fused pyrrole derivatives in toluene under microwave irradiation via a cycloaddition and metal-free Pummerer-type sulfone deoxygenation path. In order to obtain the desired sulfone derivatives, the sulfide group underwent oxidation with m-CPBA to afford sulfones. The structures of all the new products were elucidated by spectroscopic/physical methods and, in two cases, by X-ray diffraction...
September 27, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27677735/antioxidative-and-antiproliferative-activities-of-novel-pyrido-1-2-a-benzimidazoles
#11
Martina Tireli, Kristina Starčević, Tamara Martinović, Sandra Kraljević Pavelić, Grace Karminski-Zamola, Marijana Hranjec
A series of pyrido[1,2-a]benzimidazoles has been designed, and novel examples are synthesized and evaluated for their potential antiproliferative activity against four human tumour cell lines-cervical (HeLa), colorectal (SW620), breast (MCF-7) and hepatocellular carcinoma (HepG2). In addition, their antioxidative potency has been evaluated by in vitro spectrophotometric assays. Preliminary structure-activity relationships among the synthesized compounds are discussed. Evaluation of their antioxidative capacity has shown that two compounds (25 and 26) possess promising reducing characteristics and free radical scavenging activity...
September 27, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27670881/indium-triflate-promoted-one-pot-multicomponent-synthesis-of-structurally-diverse-3-amino-imidazo-1-2-a-pyridines
#12
Suman Swami, Arunava Agarwala, Rahul Shrivastava
An efficient, mild, and expeditious synthetic protocol has been developed for the synthesis of structurally diverse 3-amino-imidazo[1,2-a]pyridines, involving a three-component, one-pot cyclocondensation reaction of 2-aminobenzothiazole/2-aminoazines, ethyl isocyanoacetate/tert-butyl isocyanides, and pyrazole-3(4)-carbaldehyde/substituted aromatic carbonyl compounds in 45 min. using In(OTf)[Formula: see text] as a catalyst in toluene. Mild reaction conditions, high atom economy, operational simplicity, short reaction time, and structural diversity with high product conversion are among the advantages of the present synthetic protocol...
September 26, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27670880/synthesis-of-first-ever-4-quinolone-3-carboxylic-acid-appended-spirooxindole-pyrrolidine-derivatives-and-their-biological-applications
#13
Thangaraj Arasakumar, Sadasivam Mathusalini, Athar Ata, Ramasamy Shankar, Subashini Gopalan, Krishnasamy Lakshmi, Pandiyarajan Sakthivel, Palathurai Subramaniam Mohan
A series of 4-quinolone-3-carboxylic acid-containing spirooxindole-pyrrolidine derivatives was synthesized via multicomponent 1,3-dipolar cycloaddition reactions of azomethine ylides with new (E)-4-oxo-6-(3-phenyl-acryloyl)-1,4-dihydroquinoline-3-carboxylic acids in good yields with high regioselectivity. The cycloadducts were characterized by analytical and spectral data including [Formula: see text], [Formula: see text], 2D NMR and mass spectroscopy. The structure of one of the compounds (8a) was investigated theoretically by computational techniques...
September 26, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27649713/one-pot-synthesis-of-formula-see-text-spiroiminolactones-and-formula-see-text-dispiroiminolactones-using-formula-see-text-disubstituted-parabanic-acid-and-thioparabanic-acid-derivatives
#14
Sakineh Asghari, Mohammad Qandalee, Amir Ali Sarmadi
A direct entry and simple process for the synthesis of [Formula: see text]-spiroiminolactones present in a large number of natural products has been developed. In the first step, the synthesis of parabanic acid derivatives was commenced from the reaction of [Formula: see text]-disubstituted urea and thiourea with oxalyl chloride, then a three-component reaction was carried out with isocyanides, acetylenic esters, and [Formula: see text]-disubstituted parabanic acid derivatives. The method allows the construction of a variety of [Formula: see text]-spiroiminolactone structures in good to high yields starting from readily available precursors...
September 20, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27599493/efficient-one-pot-synthesis-of-new-1-amino-substituted-pyrrolo-1-2-a-quinoline-4-carboxylate-esters-via-copper-free-sonogashira-coupling-reactions
#15
Ali Keivanloo, Shaghayegh Sadat Kazemi, Hossein Nasr-Isfahani, Abdolhamid Bamoniri
The reactions of several 2-chloroquinoline-3-carboxylate esters with propargyl alcohol and a secondary amine in the presence of palladium catalyst leads to the formation of new alkyl 1-amino substituted pyrrolo[1,2-a]quinoline-4-carboxylate derivatives. This one-pot process, carried out in the absence of any copper salt, provides an efficient method for the synthesis of functionalized pyrrolo[1,2-a]quinolines in good-to-high yields.
September 6, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27599492/discovery-of-potent-nek2-inhibitors-as-potential-anticancer-agents-using-structure-based-exploration-of-nek2-pharmacophoric-space-coupled-with-qsar-analyses
#16
Mohammad A Khanfar, Fahmy Banat, Shada Alabed, Saja Alqtaishat
High expression of Nek2 has been detected in several types of cancer and it represents a novel target for human cancer. In the current study, structure-based pharmacophore modeling combined with multiple linear regression (MLR)-based QSAR analyses was applied to disclose the structural requirements for NEK2 inhibition. Generated pharmacophoric models were initially validated with receiver operating characteristic (ROC) curve, and optimum models were subsequently implemented in QSAR modeling with other physiochemical descriptors...
September 6, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27631533/plate-based-diversity-subset-screening-generation-2-an-improved-paradigm-for-high-throughput-screening-of-large-compound-files
#17
Andrew S Bell, Joseph Bradley, Jeremy R Everett, Jens Loesel, David McLoughlin, James Mills, Marie-Claire Peakman, Robert E Sharp, Christine Williams, Hongyao Zhu
High-throughput screening (HTS) is an effective method for lead and probe discovery that is widely used in industry and academia to identify novel chemical matter and to initiate the drug discovery process. However, HTS can be time consuming and costly and the use of subsets as an efficient alternative to screening entire compound collections has been investigated. Subsets may be selected on the basis of chemical diversity, molecular properties, biological activity diversity or biological target focus. Previously, we described a novel form of subset screening: plate-based diversity subset (PBDS) screening, in which the screening subset is constructed by plate selection (rather than individual compound cherry-picking), using algorithms that select for compound quality and chemical diversity on a plate basis...
November 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27599494/synthesis-of-pyrazolo-1-5-a-pyrimidine-derivatives-and-their-antifungal-activities-against-phytopathogenic-fungi-in-vitro
#18
Jin Zhang, Ju-Fang Peng, Yu-Bin Bai, Ping Wang, Tao Wang, Jin-Ming Gao, Zun-Ting Zhang
5,6-Diarylpyrazolo[1,5-a]pyrimidines (3) and 6,7-diarylpyrazolo[1,5-a]pyrimidines (4) were chemoselectively synthesized by the condensation of isoflavone (1) and 3-aminopyrazole (2). 5,6-Diarylpyrazolo[1,5-a]pyrimidines (3) were obtained via microwave irradiation, and 6,7-diarylpyrazolo[1,5-a]pyrimidines (4) were obtained via conventional heating. In addition, the pyrimidine derivatives 3 and 4 were evaluated against five phytopathogenic fungi (Cytospora sp., Colletotrichum gloeosporioides, Botrytis cinerea, Alternaria solani, and Fusarium solani) using the mycelium growth rate method...
November 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27531196/synthesis-of-new-quinazolin-2-4-diones-as-anti-leishmania-mexicana-agents
#19
Eduardo Enciso, Juan I Sarmiento-Sánchez, Héctor S López-Moreno, Adrián Ochoa-Terán, Ulises Osuna-Martínez, Evangelina Beltrán-López
The quinazolin-2,4-dione moiety is found in many compounds with important biological activities making it a target for its synthesis. In this work, a one-pot three-step synthesis of new quinazolin-2,4-diones from phthalic anhydrides and their activity against Leishmania mexicana are described. The new quinazolin-2,4-diones were isolated with yields in the range of 32-70 %. All compounds displayed lower cytotoxicity in RAW 264.7 macrophage over miltefosine. Compound 6,7-dichloro-3-phenylquinazoline-2,4(1H,3H)-dione (6e) displayed an attractive profile which includes anti-Leishmania mexicana activity ([Formula: see text] [Formula: see text]M), much lower cytotoxic activity ([Formula: see text] [Formula: see text]M) and a high selective index ([Formula: see text]) proving to be superior to miltefosine...
November 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27480630/design-and-synthesis-of-novel-protein-kinase-r-pkr-inhibitors
#20
Sagiv Weintraub, Tali Yarnitzky, Shirin Kahremany, Iliana Barrera, Olga Viskind, Kobi Rosenblum, Masha Y Niv, Arie Gruzman
Protein kinase RNA-activated (PKR) plays an important role in a broad range of intracellular regulatory mechanisms and in the pathophysiology of many human diseases, including microbial and viral infections, cancer, diabetes and neurodegenerative disorders. Recently, several potent PKR inhibitors have been synthesized. However, the enzyme's multifunctional character and a multitude of PKR downstream targets have prevented the successful transformation of such inhibitors into effective drugs. Thus, the need for additional PKR inhibitors remains...
November 2016: Molecular Diversity
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