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Molecular Diversity

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https://www.readbyqxmd.com/read/28084603/a-synthesis-of-fused-acenaphthopyrrolizines-via-the-1-3-dipolar-cycloaddition-reaction-of-azomethine-ylides-with-acetylenic-esters
#1
Issa Yavari, Leila Baoosi, Mohammad R Halvagar
An efficient synthesis of tetraalkyl 6a-hydroxy-3-alkyl-3H,6aH-acenaphtho[1,2-g] pyrrolizine-1,2,5,6-tetracarboxylates via the 1,3-dipolar cycloaddition reaction of azomethine ylides (generated in situ from [Formula: see text]-amino acids and acenaphthylene-1,2-dione) with dialkyl acetylenedicarboxylates is described. When glycine was used instead of alanine, phenylalanine, valine, or isoleucine, dialkyl (E)-1[Formula: see text]-(1,4-dialkoxy-1,4-dioxobut-2-en-2-yl)-2-oxo-[Formula: see text],5[Formula: see text]-dihydro-2H-spiro [acenaphthylene-1,2[Formula: see text]-pyrrole]-3[Formula: see text],4[Formula: see text]-dicarboxylates were obtained...
January 13, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28083767/a-green-one-pot-three-component-cascade-reaction-the-synthesis-of-2-amino-5-8-dihydro-3h-pyrido-2-3-d-pyrimidin-4-ones-in-aqueous-medium
#2
Ahmad Shaabani, Heshmatollah Sepahvand, Mahmoud Borjian Boroujeni, Mohammad Tayeb Faroghi
A one-pot three-component cascade reaction for the green synthesis of a new class of 2-amino-5,8-dihydro-3H-pyrido[2,3-d]pyrimidin-4-ones was developed from the condensation of aromatic aldehydes with 2,6-diaminopyrimidin-4(3H)-one and acetophenone derivatives or various cyclic ketones in the presence of a catalytic amount of sodium carbonate in a mixture of water and ethanol at 60  [Formula: see text]. This reaction led to the construction of two carbon-carbon bonds and one carbon-nitrogen bond in a single synthetic step...
January 12, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28078550/iodine-mediated-formula-see-text-c-h-functionalization-of-methyl-ketones-a-one-pot-synthesis-of-functionalized-indolizines-via-the-1-3-dipolar-cycloaddition-reaction-between-pyridinium-ylides-and-ynones
#3
Issa Yavari, Jamil Sheykhahmadi, Maryam Naeimabadi, Mohammad Reza Halvagar
An efficient transition-metal-free approach toward C-H bond activation by using molecular [Formula: see text]-mediated [Formula: see text] C-H bond functionalization for the synthesis of indolizine derivatives via 1,3-dipolar cycloaddition reaction of nitrogen ylides with ynones is described.
January 11, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28078549/functionalized-ionic-liquid-assisted-chromatography-free-synthesis-of-bis-indolyl-methanes
#4
Sunita Choudhary, Khima Pandey, Saroj Budania, Anil Kumar
A chromatography-free synthesis of bis(indolyl)methanes has been developed using sulfonic acid and sulfonyl hydrazine-functionalized ionic liquids as catalyst and scavenger, respectively. The employed excess aldehyde for completion of the reaction was scavenged by sulfonyl hydrazine-functionalized ionic liquid. Purification of products without column chromatography, ease of monitoring and shorter reaction time are the salient features of the developed protocol. The reuse and regeneration of the catalyst and scavenger have been achieved up to 5 and 2 times, respectively, without significant loss of activity...
January 11, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28070724/identification-of-potential-glutaminyl-cyclase-inhibitors-from-lead-like-libraries-by-in-silico-and-in-vitro-fragment-based-screening
#5
Mária Szaszkó, István Hajdú, Beáta Flachner, Krisztina Dobi, Csaba Magyar, István Simon, Zsolt Lőrincz, Zoltán Kapui, Tamás Pázmány, Sándor Cseh, György Dormán
A glutaminyl cyclase (QC) fragment library was in silico selected by disconnection of the structure of known QC inhibitors and by lead-like 2D virtual screening of the same set. The resulting fragment library (204 compounds) was acquired from commercial suppliers and pre-screened by differential scanning fluorimetry followed by functional in vitro assays. In this way, 10 fragment hits were identified ([Formula: see text]5 % hit rate, best inhibitory activity: 16 [Formula: see text]). The in vitro hits were then docked to the active site of QC, and the best scoring compounds were analyzed for binding interactions...
January 9, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28058523/convenient-access-to-5-arylisoindolo-2-1-formula-see-text-quinolin-11-6a-formula-see-text-ones
#6
Melissa O'Brien, Rachael Weagle, Donald Corkum, Minati Kuanar, Prabhu P Mohapatra, Amitabh Jha
Substituted isoindoloquinolinones were obtained from N-aryl-3-hydroxyisoindolinones and aryl alkynes under Lewis acid-catalyzed conditions in 30-99% yields.
January 5, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28054284/urea-thiourea-efficient-inexpensive-and-reusable-catalysts-for-the-synthesis-of-pyrazole-derivatives-with-2-iminothiazolidin-4-one-and-2-4-thiazolidinediones-under-solvent-free-conditions
#7
Veera Swamy Konkala, Pramod Kumar Dubey
An efficient and green synthesis of pyrazolyl-2,4-thiazolidinediones/pyrazolyl-2-iminothiazolidine-4-ones 7(a-j) has been developed using urea/thiourea as catalyst. Two methods (A and B) have been introduced for the synthesis of these compounds. Method A performed well for the condensation of pyrazole-4-carboxaldehydes 4(a-e) with 2-iminothiazolidin-4-one 5a and with 2,4-thiazolidinedione 5b at 110 [Formula: see text] for 16-20 min to furnish (Z)-5-((1,3-diphenyl-1H-pyrazol-4-yl)methylene)thiazolidine-2,4-diones 7(a-j) in excellent yields...
January 4, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28050687/the-role-of-multidrug-resistance-protein-mrp-1-as-an-active-efflux-transporter-on-blood-brain-barrier-bbb-permeability
#8
Karthik Lingineni, Vilas Belekar, Sujit R Tangadpalliwar, Prabha Garg
Drugs acting on central nervous system (CNS) may take longer duration to reach the market as these compounds have a higher attrition rate in clinical trials due to the complexity of the brain, side effects, and poor blood-brain barrier (BBB) permeability compared to non-CNS-acting compounds. The roles of active efflux transporters with BBB are still unclear. The aim of the present work was to develop a predictive model for BBB permeability that includes the MRP-1 transporter, which is considered as an active efflux transporter...
January 3, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28039637/design-synthesis-in-silico-and-biological-evaluation-of-novel-2-4-4-substituted-piperazin-1-yl-benzylidene-hydrazine-carboxamides
#9
Shikha Kumari, Chandra Bhushan Mishra, Danish Idrees, Amresh Prakash, Rajesh Yadav, Md Imtaiyaz Hassan, Manisha Tiwari
A series of novel 2-(4-(4-substituted piperazin-1-yl)benzylidene)hydrazinecarboxamide derivatives has been successfully designed and synthesized to evaluate their potential as carbonic anhydrase (CA) inhibitors. The inhibitory potential of synthesized compounds against human CAI and CAII was evaluated. Compounds 3a-n exhibited [Formula: see text] values between [Formula: see text] against CAI and [Formula: see text] against CAII. Compound 3g was the most active inhibitor, with an [Formula: see text] value of [Formula: see text] against CAII...
December 30, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/28028725/substituted-tetrazoles-as-multipurpose-screening-compounds
#10
Nicole Rüger, Georg Michael Fassauer, Christian Bock, Thomas Emmrich, Anja Bodtke, Andreas Link
Tetrazoles are small functional heterocycles that are suited to serve simultaneously as aromatic platform for diversity and as functional interaction motif. Furthermore, the tetrazole ring and its deprotonated tetrazolate counterpart are metal ion complexing ligands that possess a rich variety of binding and bridging modes. We recently demonstrated that fragments containing the tetrazole moiety and a metal chelating hydrazide group are well suited to discover selective screening hits with high ligand efficiency for a given protein target...
December 27, 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27904990/computer-modeling-in-predicting-the-bioactivity-of-human-5-lipoxygenase-inhibitors
#11
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
#12
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
#13
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
#14
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/27631533/plate-based-diversity-subset-screening-generation-2-an-improved-paradigm-for-high-throughput-screening-of-large-compound-files
#15
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
#16
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
#17
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
#18
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
https://www.readbyqxmd.com/read/27480629/synthesis-and-antifungal-activity-of-dehydroabietic-acid-based-1-3-4-thiadiazole-thiazolidinone-compounds
#19
Naiyuan Chen, Wengui Duan, Guishan Lin, Luzhi Liu, Rui Zhang, Dianpeng Li
In an attempt to search for new natural products-based antifungal agents, a series of novel dehydroabietic acid derivatives bearing a 1,3,4-thiadiazole-thiazolidinone moiety were designed and synthesized. The primary bioassay used showed that at a concentration of [Formula: see text], the target compounds 3c, 3f, and 3n exhibited excellent antifungal activity (91.3 % inhibition) against Gibberella zeae, which was equivalent to the commercial antifungal drug azoxystrobin (positive control).
November 2016: Molecular Diversity
https://www.readbyqxmd.com/read/27431577/computational-predictive-models-for-p-glycoprotein-inhibition-of-in-house-chalcone-derivatives-and-drug-bank-compounds
#20
Trieu-Du Ngo, Thanh-Dao Tran, Minh-Tri Le, Khac-Minh Thai
The human P-glycoprotein (P-gp) efflux pump is of great interest for medicinal chemists because of its important role in multidrug resistance (MDR). Because of the high polyspecificity as well as the unavailability of high-resolution X-ray crystal structures of this transmembrane protein, ligand-based, and structure-based approaches which were machine learning, homology modeling, and molecular docking were combined for this study. In ligand-based approach, individual two-dimensional quantitative structure-activity relationship models were developed using different machine learning algorithms and subsequently combined into the Ensemble model which showed good performance on both the diverse training set and the validation sets...
November 2016: Molecular Diversity
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