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https://www.readbyqxmd.com/read/28100082/synthesis-and-bioactivity-of-several-new-hetaryl-sulfonamides
#1
Parham Taslimi, Afsun Sujayev, Sevgi Mamedova, Pınar Kalın, İlhami Gulçin, Nastaran Sadeghian, Sukru Beydemir, O Irfan Kufrevioglu, Saleh H Alwasel, Vagif Farzaliyev, Sabir Mamedov
1-(4-Methylsulfonyl)-2-thione-4-aryl-5-Z-6-methyl and oxyalkyl-imidazoles were synthesized from different tetrahydropyrimidinethiones and aryl sulfonyl chloride. These compunds were tested for metal chelating effects and to determine the phrase in which inhibition occured between two physiologically pertinent compunds and carbonic anhydrase (CA) isozymes I and II (hCA I and II), butyrylcholinesterase (BChE) and acetylcholinesterase (AChE). AChE was detected in high concentrations in the brain and red blood cells...
December 2017: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/28071904/new-insight-into-the-formation-mechanism-of-imidazolium-based-ionic-liquids-from-n-alkyl-imidazoles-and-halogenated-hydrocarbons-a-polar-microenvironment-induced-and-auto-promoted-process
#2
Xueli Mu, Nan Jiang, Chengbu Liu, Dongju Zhang
To illustrate the formation mechanism of imidazolium-based ionic liquids (ILs) from N-alkyl imidazoles and halogenated hydrocarbons, density functional theory calculations have been carried out on a representative system, the reaction of N-methyl imidazole with chloroethane to form 1-ethyl-3-methyl imidazolium chloride ([Emim]Cl) IL. The reaction is shown to proceed via a SN2 transition state with a free energy barrier of 34.4 kcal/mol in gas phase and 27.6 kcal/mol in toluene solvent. The reaction can be remarkably promoted by the presence of ionic products and water molecules...
January 10, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28070178/palladium-catalyzed-%C3%AE-arylation-of-methyl-sulfonamides-with-aryl-chlorides
#3
Bing Zheng, Minyan Li, Gui Gao, Yuying He, Patrick J Walsh
A Palladium-catalyzed α-arylation of sulfonamides with aryl chlorides is presented. A Buchwald type precatalyst formed with Kwong's indole-based ligand enabled this transformation to be compatible with a large variety of methyl sulfonamides and aryl chlorides in good to excellent yields. Importantly, under the optimized reaction conditions, only mono-arylated products were observed. This method has been applied to the efficient synthesis of sumatriptan, which is used to treat migraines.
June 30, 2016: Advanced Synthesis & Catalysis
https://www.readbyqxmd.com/read/28068108/transferability-and-adhesion-of-sol-gel-derived-crystalline-tio2-thin-films-to-different-types-of-plastic-substrates
#4
Natsumi Amano, Mitsuru Takahashi, Hiroaki Uchiyama, Hiromitsu Kozuka
Anatase thin films were prepared on various plastic substrates by our recently developed sol-gel transfer technique. Polycarbonate (PC), poly(methyl methacrylate) (PMMA), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyether ether ketone (PEEK), and polyvinylidene chloride (PVDC) were employed as plastic substrates. A Si(100) substrate was first coated with a polyimide (PI)/polyvinylpyrrolidone (PVP) mixture layer, and an alkoxide-derived titania gel film was deposited on it by spin-coating...
January 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28067653/photocatalytic-degradation-of-methyl-orange-methylene-blue-and-rhodamine-b-with-agcl-nanocatalyst-synthesised-from-its-bulk-material-in-the-ionic-liquid-p6-6-6-14-cl
#5
Borja Rodríguez-Cabo, Iago Rodríguez-Palmeiro, Raquel Corchero, Rosario Rodil, Eva Rodil, Alberto Arce, Ana Soto
The photocatalytic degradation of wastewater containing three industrial dyes belonging to different families, methyl orange (MO), methylene blue (MB) and Rhodamine B (RhB), was studied under UV-Vis irradiation using synthesised silver chloride nanoparticles. The nanocatalyst was prepared by a dissolution/reprecipitation method starting from the bulk powder and the ionic liquid trihexyl(tetradecyl)phosphonium chloride, [P6 6 6 14]Cl, without addition of other solvents. The obtained catalyst was characterised by UV-Vis absorbance, X-ray powder diffraction, transmission electron microscopy and scanning electron microscopy...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28060829/enhancement-of-dose-response-and-nuclear-magnetic-resonance-image-of-pagat-polymer-gel-dosimeter-by-adding-silver-nanoparticles
#6
Rahim Sabbaghizadeh, Roslinda Shamsudin, Najmeh Deyhimihaghighi, Arman Sedghi
In the present study, the normoxic polyacrylamide gelatin and tetrakis hydroxy methyl phosphoniun chloride (PAGAT) polymer gel dosimeters were synthesized with and without the presence of silver (Ag) nanoparticles. The amount of Ag nanoparticles varied from 1 to 3 ml with concentration 3.14 g/l, thus forming two types of PAGAT polymer gel dosimeters before irradiating them with 6 to 25 Gy produced by 1.25-MeV 60Co gamma rays. In this range, the predominant gamma ray interaction with matter is by Compton scattering effect, as the photoelectric absorption effect diminishes...
2017: PloS One
https://www.readbyqxmd.com/read/28059406/cubane-like-tetranuclear-cu-ii-complexes-bearing-a-cu4o4-core-crystal-structure-magnetic-properties-dft-calculations-and-phenoxazinone-synthase-like-activity
#7
Shipra Sagar, Swaraj Sengupta, Antonio J Mota, Shyamal K Chattopadhyay, Arturo Espinosa Ferao, Eric Riviere, William Lewis, Subhendu Naskar
In the present work, two new copper complexes 3a and 3b with a Cu4O4 cubane core are reported. Both complexes are obtained by means of the in situ conversion of the imine functionality of Schiff's base ligands 1a [(E)-4-chloro-2-((thiazol-2-ylimino)methyl)phenol] and 1b [(E)-4-bromo-2-((thiazol-2-ylimino)methyl)phenol] into amino alcohols 2a (4-chloro-2-(hydroxy(thiazol-2-ylamino)methyl)phenol) and 2b (4-bromo-2-(hydroxy(thiazol-2-ylamino)methyl)phenol), respectively. The ligand transformation may be metal assisted and the generated ligands show an interesting mode of coordination in which the alkoxo-O atom binds in a μ(3)-manner connecting simultaneously three copper centers and forming a Cu4O4 cubane core...
January 6, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28058766/synthesis-of-molecularly-imprinted-polymers-by-atom-transfer-radical-polymerization-for-the-solid-phase-extraction-of-phthalate-esters-in-edible-oil
#8
Ningning Chen, Juan He, Chaojun Wu, Yuanyuan Li, An Suo, Hongliang Wei, Lijun He, Shusheng Zhang
Novel molecularly imprinted polymers of phthalate esters were prepared by atom transfer radical polymerization using methyl methacrylate as functional monomer, cyclohexanone as solvent, cuprous chloride as catalyst, 1-chlorine-1-ethyl benzene as initiator and 2,2-bipyridyl as cross-linker in the mixture of methanol and water (1:1, v/v). The effect of reaction conditions such as monomer ratio and template on the adsorption properties was investigated. The optimum condition was obtained by an orthogonal experiment...
January 6, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28055202/somc-designed-silica-supported-tungsten-oxo-imidazolin-2-iminato-methyl-precatalyst-for-olefin-metathesis-reactions
#9
Ziyauddin S Qureshi, Ali Hamieh, Samir Barman, Niladri Maity, Manoja K Samantaray, Samy Ould-Chikh, Edy Abou-Hamad, Laura Falivene, Valerio D'Elia, Alexander Rothenberger, Isabelle Llorens, Jean-Louis Hazemann, Jean-Marie Basset
Synthesis, structure, and olefin metathesis activity of a surface complex [(≡Si-O-)W(═O)(CH3)2-Im(Dipp)N] (4) (Im(Dipp) = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-iminato) supported on silica by a surface organometallic chemistry (SOMC) approach are reported. The reaction of N-silylated 2-iminoimidazoline with tungsten(VI) oxytetrachloride generated the tungsten oxo imidazolin-2-iminato chloride complex [Im(Dipp)NW(═O)Cl3] (2). This was grafted on partially dehydroxylated silica pretreated at 700 °C (SiO2-700) to afford a well-defined monopodal surface complex [(≡Si-O-)W(═O)Cl2-Im(Dipp)N] (3)...
January 5, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28055194/nonredox-metal-ions-enhanced-dioxygen-activation-by-oxidovanadium-iv-complexes-toward-hydrogen-atom-abstraction
#10
Jisheng Zhang, Hang Yang, Tingting Sun, Zhuqi Chen, Guochuan Yin
Dioxygen activation toward efficient catalysis at ambient temperature is still a big challenge for industrial oxidations, while it proceeds smoothly in nature. This work presents an example of that adding nonredox metal ions as Lewis acid can enhance dioxygen activation by oxidovanadium(IV) complex, [V(IV)(O)Cl(TPA)]PF6 (where TPA is tris-[(2-pyridy)methyl]amine), which leads to efficient hydrogen abstraction at ambient temperature, whereas, in the absence of a Lewis acid, the catalytic hydrogen abstraction of the oxidovanadium(IV) complex is very sluggish...
January 5, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28054521/samarium-153-4-bis-phosphonomethyl-carbamoyl-methyl-7-10-bis-carboxymethyl-1-4-7-10-tetraazacyclododec-1-yl-acetic-acid-a-novel-agent-for-bone-pain-palliation-therapy
#11
Hassan Yousefnia, Razieh Enayati, Mohammad Hosntalab, Samaneh Zolghadri, Ali Bahrami-Samani
AIM: Various phosphonate ligands labeled with β--emitting radionuclides have shown good efficacy for bone pain palliation. In this study, a new agent for bone pain palliation has been developed. MATERIALS AND METHODS: Samarium-153-(4-[((bis(phosphonomethyl))carbamoyl)methyl]-7,10-bis (carboxymethyl)-1,4,7,10-tetraazacyclododec-1-yl) acetic acid (153Sm-BPAMD) complex was prepared using BPAMD ligand and samarium-153 chloride. The effect of various parameters on the labeling yield of 153Sm-BPAMD including ligand concentration, pH, temperature, and reaction time were studied...
July 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28049906/acylated-glycosidic-acid-methyl-esters-generated-from-the-convolvulin-fraction-of-rhizoma-jalapae-braziliensis-by-treatment-with-indium-iii-chloride-in-methanol
#12
Masateru Ono, Satoko Oda, Shin Yasuda, Tomoko Mineno, Masafumi Okawa, Junei Kinjo, Hiroyuki Miyashita, Hitoshi Yoshimitsu, Toshihiro Nohara, Kazumoto Miyahara
Four hexaglycosides of methyl 3S,12S-dihydroxyhexadecanoate (1-4) were provided after treatment of the crude convolvulin fraction from Rhizoma Jalapae Braziliensis (the root of Ipomoea operculata (GOMES) MART., Convolvulaceae) with indium(III) chloride in methanol. The structures of 1-4 were elucidated on the basis of spectroscopic and chemical methods. Their sugar moieties were partially acylated with organic acids including (3S,9R)-3,6:6,9-diepoxydecanoic (exogonic) acid, (E)-2-methylbut-2-enoic (tiglic) acid, and isovaleric acid...
2017: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28025570/optical-gas-sensing-of-ammonia-and-amines-based-on-protonated-porphyrin-tio%C3%A2-composite-thin-films
#13
Pedro Castillero, Javier Roales, Tânia Lopes-Costa, Juan R Sánchez-Valencia, Angel Barranco, Agustín R González-Elipe, José M Pedrosa
Open porous and transparent microcolumnar structures of TiO₂ prepared by physical vapour deposition in glancing angle configuration (GLAD-PVD) have been used as host matrices for two different fluorescent cationic porphyrins, 5-(N-methyl 4-pyridyl)-10,15,20-triphenyl porphine chloride (MMPyP) and meso-tetra (N-methyl 4-pyridyl) porphine tetrachloride (TMPyP). The porphyrins have been anchored by electrostatic interactions to the microcolumns by self-assembly through the dip-coating method. These porphyrin/TiO₂ composites have been used as gas sensors for ammonia and amines through previous protonation of the porphyrin with HCl followed by subsequent exposure to the basic analyte...
December 23, 2016: Sensors
https://www.readbyqxmd.com/read/28009490/exploring-the-chemical-reaction-space-at-the-formation-of-chalcogenidometalate-superspheres-in-ionic-liquids
#14
Stefanie Dehnen, Silke Santner, Jan J Weigand, Sivathmeehan Yogendra
The synthesis of anionic chalcogenidometalate superspheres can be achieved from [Ge4Se10]4- salts and SnCl4 in ionic liquids with (Cn(C1)C1Im)+ cations (n = 4, 6, 8). Its formation is apparently independent from the lengths of the Cn chain and the presence or absence of a second methyl group at the ionic liquid cation that are exchanged for alkali metal cations during the reactions, although this may appear counterintuitive. In contrast, and equally counterintuitive, the ionic liquid anion was found to play a crucial role for both the general observability as well as the crystal yield and quality of the products, although they are not part of the product: a minimum content of chloride is needed, while ionic liquids with [BF4]- anions alone do not support the product formation/crystallization...
December 23, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28003630/in-vitro-evaluation-of-the-biocompatibility-of-newly-synthesized-bis-quaternary-ammonium-compounds-with-spacer-structures-derived-from-pentaerythritol-or-hydroquinone
#15
Masashi Yamamoto, Takashi Takami, Reiko Matsumura, Alexander Dorofeev, Yoshihiko Hirata, Hideaki Nagamune
 With the object of developing new biocides milder for human use than the current antiseptics, we synthesized a series of bis-quaternary ammonium compounds (bis-QACs). The antimicrobial activity of the newly synthesized bis-QACs and common biocides used as antiseptics was compared by examining minimum inhibitory concentrations and minimum bactericidal concentrations (MBCs). Moreover, the cytotoxicity of these compounds against human cells was determined to calculate the biocompatibility index (BI) of these compounds...
2016: Biocontrol Science
https://www.readbyqxmd.com/read/28002645/biologically-active-heterocyclic-hybrids-based-on-quinazolinone-benzofuran-and-imidazolium-moieties-synthesis-characterization-cytotoxic-and-antibacterial-evaluation
#16
Parvin Asadi, Ghadamali Khodarahmi, Ali Jahanian-Najafabadi, Lotfollah Saghaie, Farshid Hassanzadeh
Cytotoxic and antimicrobial agents structurally based on quinazolinone, benzofuran and imidazole pharmacophores, have been designed and synthesized. Spectral (IR, (1) H NMR) and elemental analysis data established the structures of these novel 1-[[(1-(benzofuran-2-yl)-2-(quinazolin-4(3H)-one-3-yl)]ethyl-1-yl]-3- methyl imidazol-1-ium chloride hybrid derivatives. All the synthesized compounds were evaluated for in vitro cytotoxicity and antimicrobial activities. Cytotoxic evaluation using MTT assay revealed that compounds 12c, 12g and 12i exhibited significant cytotoxicity with IC50 values 1, 1, 0...
December 21, 2016: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/27998718/camkii-mediated-phosphorylation-of-glun2b-regulates-recombinant-nmda-receptor-currents-in-a-chloride-dependent-manner
#17
Steven J Tavalin, Roger J Colbran
Some forms of long-term synaptic plasticity require docking of Ca(2+)/calmodulin-dependent protein kinase II α (CaMKIIα) to residues 1290-1309 within the intracellular C-terminal tail of the N-methyl-d-aspartate (NMDA) receptor GluN2B subunit. The phosphorylation of Ser1303 within this region destabilizes CaMKII binding. Interestingly, Ser1303 is a substrate for CaMKII itself, as well as PKC and DAPK1, but these kinases have been reported to have contradictory effects on the activity of GluN2B-containing NMDA receptors...
December 18, 2016: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/27973765/a-long-cycling-aqueous-organic-redox-flow-battery-aorfb-towards-sustainable-and-safe-energy-storage
#18
Bo Hu, Camden Debruler, Zayn Rhodes, Tianbiao Liu
Redox flow batteries (RFBs) are a viable technology to store renewable energy in the form of electricity that can be supplied to electricity grids. However, wide-spread implementation of traditional RFBs, such as Vanadium and Zn-Br2 RFBs is limited due to a number of challenges related to materials, including low abundance and high costs of redox active metals, expensive separators, active material crossover, and corrosive and hazardous electrolytes. To address these challenges, we demonstrate a neutral aqueous organic redox flow battery (AORFB) technology utilizing a newly designed cathode electrolyte containing a highly water-soluble ferrocene molecule...
December 14, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27968714/dissolving-capability-difference-based-sequential-extraction-a-versatile-tool-for-in-depth-membrane-proteome-analysis
#19
Fei Fang, Qun Zhao, Xiao Li, Zhen Liang, Lihua Zhang, Yukui Zhang
Profiling membrane proteins would facilitate revealing disease mechanism and discovering new drug targets as they play essential roles in cellular signaling, substrate transport, and cell adhesion. However, the analysis of membrane proteins still remains a challenge due to their high hydrophobicity, as well as the suppression effect of high abundant soluble proteins. In this work, to achieve a membrane proteome profiling, a sample preparation strategy based on sequential extraction at the protein level assisted by a range of extraction reagents with different dissolving capabilities, followed by nano-RPLC-ESI-MS/MS analysis was developed and applied for HeLa cell line analysis...
November 16, 2016: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27960284/gas-purge-microextraction-coupled-with-stable-isotope-labeling-liquid-chromatography-mass-spectrometry-for-the-analysis-of-bromophenols-in-aquatic-products
#20
Shijuan Zhang, Qiuhui Yu, Cuncun Sheng, Jinmao You
A green, sensitive, and accurate method was developed for the extraction and determination of bromophenols (BPs) from aquatic products by using organic solvent-free gas purge microsyringe extraction (GP-MSE) technique in combination with stable isotope labeling (SIL) strategy. BPs were extracted by NaHCO3 buffer solution, with recoveries varying from 92.0% to 98.5%. The extracted solution was analyzed by SIL strategy, during which analytes and standards were labeled by 10-methyl-acridone-2-sulfonyl chloride (d0-MASC) and its deuterated counterpart d3-MASC, respectively...
December 14, 2016: Journal of Agricultural and Food Chemistry
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