bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Stereochemical Aspects and the Synthetic Scope of the SHi at the Sulfur Atom. Preparation of Enantiopure 3‐Substituted 2,3‐Dihydro‐1,2‐benzoisothiazole 1‐Oxides and 1,1‐Dioxides.
Authors: Fernandez‐Salas Jose A. , Rodriguez‐Fernandez M. Mercedes , Maestro M. Carmen , Garcia‐Ruano Jose L. 
Published: September 2014

AbstractAn efficient method to obtain enantiopure 3‐substituted benzosulfinamides and sulfonamides from N‐tert‐butanesulfinylimines is described.
ChemInform Abstract: Intermolecular Domino Reaction of Two Aryl Iodides Involving Two C—H Functionalizations.
Authors: Sickert Marcel , Weinstabl Harald , Peters Brendan , Hou Xiao , Lautens Mark 
Published: September 2014

AbstractA wide range of polycyclic compounds is constructed through dimerization or a domino reaction of the two different aryl iodides.
ChemInform Abstract: Directed Ruthenium‐Catalyzed C(sp3)—H α‐Alkylation of Cyclic Amines Using Dioxolane‐Protected Alkenones.
Authors: Kulago Artem A. , Van Steijvoort Ben F. , Mitchell Emily A. , Meerpoel Lieven , Maes Bert U. W. 
Published: September 2014

AbstractThe pyridin‐2‐yl group is found to be an efficient directing group for the ruthenium catalyzed α‐alkylation of cyclic amines using dioxolane protected alkenones (II) and (XVII) or ester (XX).
ChemInform Abstract: Transition‐Metal‐Catalyzed C—H Bond Functionalizations: Feasible Access to a Diversity‐Oriented β‐Carboline Library.
Authors: Wu Ningjie , Song Feijie , Yan Lipeng , Li Juan , You Jingsong 
Published: September 2014

AbstractThree strategies for regioselective functionalization of β‐carbolines by metal‐catalyzed C—C bond formation reactions are developed.
ChemInform Abstract: On the Scope of the Pt‐Catalyzed Srebnik Diborylation of Diazoalkanes. An Efficient Approach to Chiral Tertiary Boronic Esters and Alcohols via B‐Stabilized Carbanions.
Authors: Wommack Andrew J. , Kingsbury Jason S. 
Published: September 2014

AbstractThe formed geminal diboronic esters can be transformed to tertiary boronic esters, alcohols and stilbenes in good to excellent yields.
ChemInform Abstract: Synthesis of C2‐Methylene Glycitols from 1,2‐Cyclopropanated Sugars: En Route to Iminosugar Analogues.
Authors: Seshadri Kalapati , Sridhar Perali Ramu 
Published: September 2014

AbstractOther diastereomers of (I) are converted to the corresponding stereoisomers of (VIII) in comparable yields.
ChemInform Abstract: Myrotheciumones: Bicyclic Cytotoxic Lactones Isolated from an Endophytic Fungus of Ajuga decumbens.
Authors: Lin Ting , Wang Guanghui , Shan Wenjun , Zeng Dequan , Ding Rong , Jiang Xin , Zhu Dan , Liu Xiaoxuan , Yang Shuiyuan , Chen Haifeng 
Published: September 2014

AbstractThe bicyclic lactones, myrotheciumones A (I) and B (II), possessing a rare ring‐fusion system are isolated from the secondary metabolites of M.
ChemInform Abstract: Synthetic and Biological Studies of Phaeosphaerides.
Authors: Chatzimpaloglou Anthoula , Kolosov Mikhail , Eckols T. Kris , Tweardy David J. , Sarli Vasiliki 
Published: September 2014

AbstractThe first total syntheses of phaeosphaeride B (I) and an unnatural phaeosphaeride are reported.
ChemInform Abstract: Ultra‐Strong and Low‐Density Nanotubular Bulk Materials with Tunable Feature Sizes.
Authors: Biener Monika M. , Ye Jianchao , Baumann Theodore F. , Wang Y. Morris , Shin Swanee J. , Biener Juergen , Hamza Alex V. 
Published: September 2014

AbstractUltralow‐density, ultra‐high suface area Al2O3 and TiO2 bulk materials with interconnected nanotubular morphology are synthesized.
ChemInform Abstract: Solid‐Phase Peptide Synthesis (SPPS), C‐Terminal vs. Side‐Chain Anchoring: A Reality or a Myth
Authors: Cherkupally Prabhakar , Acosta Gerardo A. , Ramesh Suhas , De la Torre Beatriz G. , Govender Thavendran , Kruger Hendrik G. , Albericio Fernando 
Published: September 2014

AbstractReview: 75 refs.
ChemInform Abstract: Use of Ionic Liquids as Neoteric Solvents in the Synthesis of Fused Heterocycles
Authors: Nevagi Reshma J. , Dighe Santosh N. , Dighe Satish N. , Chaskar Pratip K. , Srinivasan Kumar V. , Jain Kishor S. 
Published: September 2014

AbstractReview: [125 refs.
Benzofuran–Chalcone Hybrids as Potential Multifunctional Agents against Alzheimer’s Disease: Synthesis and in vivo Studies with Transgenic Caenorhabditis elegans
Authors: Sashidhara Koneni V. , Modukuri Ram K. , Jadiya Pooja , Dodda Ranga Prasad , Kumar Manoj , Sridhar Balasubramaniam , Kumar Vikash , Haque Rizwanul , Siddiqi Mohammad Imran , Nazir Aamir 
Published: September 2014

AbstractIn the search for effective multifunctional agents for the treatment of Alzheimer’s disease (AD), a series of novel hybrids incorporating benzofuran and chalcone fragments were designed and synthesized. These hybrids were screened by using a transgenic Caenorhabditis elegans model that expresses the human β‐amyloid (Aβ) peptide. Among the hybrids investigated, (E)‐3‐(7‐methyl‐2‐(4‐methylbenzoyl)benzofuran‐5‐yl)‐1‐phenylprop‐2‐en‐1‐one (4 f), (E)‐3‐(2‐benzoyl‐7‐methylbenzofuran‐5‐yl)‐1‐phenylprop‐2‐en‐1‐one (4 i), and (E)‐3‐(2‐benzoyl‐7‐methylbenzofuran‐5‐yl)‐1‐(thiophen‐2‐yl)prop‐2‐en‐1‐one (4 m) significantly decreased Aβ aggregation and increased acetylcholine (ACh) levels along with the overall availability of ACh at the synaptic junction. These compounds were also found to decrease acetylcholinesterase (AChE) levels, reduce oxidative stress in the worms, lower lipid content, and to provide protection against chemically induced cholinergic neurodegeneration. Overall, the multifunctional effects of these hybrids qualify them as potential drug leads for further development in AD therapy.
A continuum model for platelet plug formation, growth and deformation
Authors: Storti F. , van de Vosse F. N. 
Published: September 2014

SUMMARYA numerical framework for modelling platelet plug dynamics is presented in this work. It consists of an extension of a biochemical and plug growth model with a solid mechanics model for the plug coupled with a fluid–structure interaction model for the blood flow–plug system. The platelet plug is treated as a neo‐Hookean elastic solid, of which the implementation is based on an updated Lagrangian approach. The framework is applied to different haemodynamic configurations coupled with different shear moduli of the plug. Results about plug growth, shape and size, as well as the stress distribution, are shown. Based on the simulations performed, we conclude that the deformability of the platelet plug is essential for its growth. Copyright © 2014 John Wiley & Sons, Ltd.
Protocol for Rational Design of Covalently Interacting Inhibitors
Authors: Schmidt Thomas C. , Welker Armin , Rieger Max , Sahu Prabhat K. , Sotriffer Christoph A. , Schirmeister Tanja , Engels Bernd 
Published: September 2014

AbstractThe inhibition potencies of covalent inhibitors mainly result from the formation of a covalent bond to the enzyme during the inhibition mechanism. This class of inhibitors has essentially been ignored in previous target‐directed drug discovery projects because of concerns about possible side effects. However, their advantages, such as higher binding energies and longer drug‐target residence times moved them into the focus of recent investigations. While the rational design of non‐covalent inhibitors became standard the corresponding design of covalent inhibitors is still in its early stages. Potent covalent inhibitors can be retrieved from large compound libraries by covalent docking approaches but protocols are missing that can reliably predict the influence of variations in the substitution pattern on the affinity and/or reactivity of a given covalent inhibitor. Hence, the wanted property profile can only be obtained from trial‐and‐error proceedings. This paper presents an appropriate protocol which is able to predict improved covalent inhibitors. It uses hybrid approaches, which mix quantum mechanical (QM) and molecular mechanical (MM) methods to predict variations in the reactivity of the inhibitor. They are also used to compute the required information about the non‐covalent enzyme–inhibitor complex. Docking tools are employed to improve the inhibitor with respect to the non‐covalent interactions formed in the binding site.
Two 3D Coordination Frameworks Based on Benzobisimidazole Linkers Generated under Similar Conditions: Synthesis, Structures and Thermal Properties
Authors: Biswas Shyam , Liu Ying‐Ya , Tonigold Markus , Weil Matthias , Volkmer Dirk 
Published: September 2014

AbstractHerein, we present two benzobisimidazole‐based 3D open coordination framework structures. Single‐crystal X‐ray analyses reveal that the title compounds [Zn(H2‐BBIM)(SO4)]·DMSO (1) (H2‐BBIM = benzobisimidazole; DMSO = dimethyl sulfoxide) and [Co(H2‐BBIM)(SO4)(DMSO)0.5] (2) possess two different framework structures, although both of them have been synthesized under similar conditions. Compounds 1 and 2 exhibit cubic diamondoid and tetragonal CrB4 topological nets, respectively, in which the four‐connected tetrahedral {MN2O2} (MII = Zn, Co) coordination units are located at the vertices and the edges are occupied by H2‐BBIM ligands and sulfate anions. Only tetracoordination is observed in 1, whereas both tetra‐ and pentacoordination is present in 2. The phase purity of the compounds was ascertained by X‐ray powder diffraction (XRPD) analysis, infrared spectroscopy, and elemental analysis. Variable‐temperature XRPD analysis indicated that 1 and 2 are stable up to 90 and 140 °C, respectively.
Iodine‐Mediated Oxidation of Ynamides: A Facile Access to N‐Monosubstituted α‐Ketoamides and α‐Ketoimides
Authors: Huang Hai , He Guangke , Zhu Xiaolin , Jin Xiaodong , Qiu Shineng , Zhu Hongjun 
Published: September 2014

AbstractAn efficient iodine‐mediated oxidation reaction for ynamides has been developed to produce N‐monosubstituted α‐ketoamides and α‐ketoimides. This oxidative method, which exhibits good functional group tolerance, was performed under mild conditions without a metal catalyst.
A Versatile and Efficient Palladium–meta‐Terarylphosphine Catalyst for the Copper‐Free Sonogashira Coupling of (Hetero‐)Aryl Chlorides and Alkynes
Authors: Yang Yong , Chew Xinying , Johannes Charles W. , Robins Edward G. , Jong Howard , Lim Yee Hwee 
Published: September 2014

AbstractA novel meta‐terarylphosphine ligand, Cy*Phine, was developed and found to be a highly active promoter of copper‐free Sonogashira cross‐coupling reactions when combined in situ with a palladium source. The evolutionary m‐terarylphosphine ligand architecture was able to impose significant performance advantages over its biarylphosphine congeners. An expedient and versatile protocol was also devised with an emphasis on substrates applicable to the fine‐chemicals industry by featuring a diverse range of challenging, electron‐rich aryl chlorides and terminal alkynes. The Pd–Cy*Phine catalyst was able to deliver products in excellent yields with efficient substrate utilization, which minimizes the generation of commonly formed byproducts, and the reaction is tolerant of a variety of substrates with unprotected functional groups.
High‐Yielding Total Synthesis of Sexually Deceptive Chiloglottones and Antimicrobial Dialkylresorcinols through an Organocatalytic Reductive Coupling Reaction
Authors: Madhavachary Rudrakshula , Ramachary Dhevalapally B. 
Published: September 2014

AbstractBiologically important, less‐explored natural products of sexually deceptive chiloglottones, antimicrobial dialkylresorcinols, and their many analogues were synthesized in very good yields in a sequential two‐pot manner by using an “organocatalytic reductive coupling reaction” as the key step.
Ordered Mesoporous Carbon and Thiolated Polyaniline Modified Electrode for Simultaneous Determination of Cadmium(II) and Lead(II) by Anodic Stripping Voltammetry
Authors: Tang Lin , Chen Jun , Zeng Guangming , Zhu Yuan , Zhang Yi , Zhou Yaoyu , Xie Xia , Yang Guide , Zhang Sheng 
Published: September 2014

AbstractThe fabrication and evaluation of a glassy carbon electrode (GCE) modified with ordered mesoporous carbon (OMC), 2‐mercaptoethanesulfonate (MES)‐tethered polyaniline (PANI) and bismuth for simultaneous determination of trace Cd2+ and Pb2+ by differential pulse anodic stripping voltammetry (DPASV) are presented here. The morphology and electrochemical properties of the fabricated electrode were respectively characterized by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). Experimental parameters such as PANI disposition, preconcentration potential, preconcentration time and bismuth concentration were optimized. Under optimum conditions, the fabricated electrode exhibited linear calibration curves ranged from 1 to 120 nM for Cd2+ and Pb2+. The limits of detection (LOD) were 0.26 nM for Cd2+ and 0.16 nM for Pb2+ (S/N=3), respectively. Additionally, repeatability, reproducibility, interference and application were also investigated, and the proposed electrode exhibited excellent performance. The proposed method could be extended for the development of other new sensors for heavy metal determination.
Alternate bars in a sandy gravel bed river: generation, migration and interactions with superimposed dunes
Authors: Rodrigues Stephane , Mosselman Erik , Claude Nicolas , Wintenberger Coraline L. , Juge Philippe 
Published: September 2014

AbstractA field study was carried out to investigate the development of alternate bars in a secondary channel of the Loire River (France) as a function of discharge variations. We combined frequent bathymetric surveys, scour chains and stratigraphical analysis of deposits with measurements and modelling of flow dynamics. The channel exhibited migrating bars, non‐migrating bars and superimposed dunes. Possible mechanisms of bar initiation were found to be chutes associated with changes of bank direction and instability resulting from interactions between existing bars during the fall in water level after floods. We propose that the reworking of bar sediments during low flows (high width‐to‐depth ratio β), reinforced by high values of the Shields mobility parameter, can explain the formation or re‐generation of new alternate migrating bars during a subsequent flood. The migration pattern of the bars was found to be cyclic and to depend mainly on (i) channel layout and (ii) the dynamics of superimposed dunes with heights and lengths depending on location and discharge value. For instance, the hysteresis affecting the steepness of dunes influences the flow resistance of the dunes as well as the celerity of migrating bars during flood events. We compare the findings from the field with results from theoretical studies on alternate bars. This gives insight in the phenomena occurring in the complex setting of real rivers, but it also sheds light on the extent to which bar theories based on idealized cases can predict those phenomena. Copyright © 2014 John Wiley & Sons, Ltd.
Multidimensional Permanents and an Upper Bound on the Number of Transversals in Latin Squares
Authors: Taranenko A. A. 
Published: September 2014

AbstractThe permanent of a multidimensional matrix is the sum of products of entries over all diagonals. A nonnegative matrix whose every 1‐dimensional plane sums to 1 is called polystochastic. A latin square of order n is an array of n symbols in which each symbol occurs exactly once in each row and each column. A transversal of such a square is a set of n entries such that no two entries share the same row, column, or symbol. Let T(n) be the maximum number of transversals over all latin squares of order n. Here, we prove that over the set of multidimensional polystochastic matrices of order n the permanent has a local extremum at the uniform matrix for whose every entry is equal to . Also, we obtain an asymptotic value of the maximal permanent for a certain set of nonnegative multidimensional matrices. In particular, we get that the maximal permanent of polystochastic matrices is asymptotically equal to the permanent of the uniform matrix, whence as a corollary we have an upper bound on the number of transversals in latin squares

urn:x-wiley:10638539:media:jcd21413:jcd21413-math-0003
Lkb1 Deletion Promotes Ectopic Lipid Accumulation in Muscle Progenitor Cells and Mature Muscles
Authors: Shan Tizhong , Zhang Pengpeng , Bi Pengpeng , Kuang Shihuan 
Published: September 2014

AbstractExcessive intramyocellular triglycerides (muscle lipids) are associated with reduced contractile function, insulin resistance, and Type 2 diabetes, but what governs lipid accumulation in muscle is unclear. Here we report a role of Lkb1 in regulating lipid metabolism in muscle stem cells and their descendent mature muscles. We used MyodCre and Lkb1flox/flox mice to specifically delete Lkb1 in myogenic cells including stem and differentiated cells, and examined the lipid accumulation and gene expression of myoblasts cultured from muscle stem cells (satellite cells). Genetic deletion of Lkb1 in myogenic progenitors led to elevated expression of lipogenic genes and ectopic lipid accumulation in proliferating myoblasts. Interestingly, the Lkb1‐deficient myoblasts differentiated into adipocyte‐like cells upon adipogenic induction. However, these adipocyte‐like cells maintained myogenic gene expression with reduced ability to form myotubes efficiently. Activation of AMPK by AICAR prevented ectopic lipid formation in the Lkb1‐null myoblasts. Notably, Lkb1‐deficient muscles accumulated excessive lipids in vivo in response to high‐fat diet feeding. These results demonstrate that Lkb1 acts through AMPK to limit lipid deposition in muscle stem cells and their derivative mature muscles, and point to the possibility of controlling muscle lipid content using AMPK activating drugs. J. Cell. Physiol. 230: 1033–1041, 2015. © 2014 Wiley Periodicals, Inc., A Wiley Company
Effect of modification of citraconic anhydrides on catalytic activity and thermostability of enzymes
Authors: Matsumoto Michiaki , Nakagawa Takashi , Uchida Yosuke , Seki Kumiko , Ohba Masayoshi , Kondo Kazuo 
Published: September 2014

AbstractBACKGROUNDActivation and stabilization of enzymes have received considerable attention. In recent years, chemical modification has re‐emerged as a powerful complementary approach to site‐directed mutagenesis and directed evolution because it is simple and effective. Chemical modification of enzymes by dicarboxylic acid anhydride enhanced their activities and stabilities.RESULTSLipase, α‐chymotrypsin and subtilisin modified by citraconic anhydride were examined. Lipase and α‐chymotrypsin were successfully modified by citraconic anhydride, while subtilisin showed poor reactivity with it. Optimum pH range for lipase and α‐chymotrypsin, and the secondary structure of α‐chymotrypsin was found to be unchanged by the modification process. Effect of the modification on the activity and thermostability of lipase was small. On the other hand, modification of lysine residues on the enzyme surface enhanced the catalytic activity and thermostability of α‐chymotrypsin. Further modification of lysine residues caused the reduction of thermostability. Modification of more hydrophobic dicarboxylic acid anhydride resulted in an increase in thermostability.CONCLUSIONThe modification of the lysine residues on the enzyme surface with citraconic anhydride shows a small effect on the catalytic reactivity and enhances the thermostability of the enzymes. © 2014 Society of Chemical Industry
Projected changes in precipitation intensity and frequency in Switzerland: a multi‐model perspective
Authors: Fischer A. M. , Keller D. E. , Liniger M. A. , Rajczak J. , Schär C. , Appenzeller C. 
Published: September 2014

ABSTRACTFundamental changes in the hydrological cycle are to be expected in a future warmer climate. For Switzerland, recent climate change assessments based on the ENSEMBLES regional climate models project for the A1B emission scenario summer mean precipitation to significantly decrease by the end of this century, whereas winter mean precipitation tend to rise in Southern Switzerland. From an end‐user perspective, projected changes in seasonal means are often insufficient to adequately address the multifaceted challenges of climate change adaptation. In this study, we investigate the projected changes in seasonal precipitation by considering changes in frequency and intensity, precipitation type (convective vs stratiform) and temporal structure (wet and dry spells) over Switzerland. As proxies for rain‐type changes, we rely on the parameterized convective and large‐scale precipitation components simulated by the models. The study reveals that the projected summer drying over Switzerland at the end of the century is mainly driven by a widespread reduction in the number of precipitation days. Thereby, the drying evolves altitude‐specific: over low‐land regions it is associated with a decrease in both convective and large‐scale precipitation. Over elevated regions it is primarily associated with a decline in large‐scale precipitation only, whereas convective precipitation remains at current levels. As a consequence, almost all the models project an increase in convective fraction at elevated altitudes. The decrease in the number of wet days during summer is accompanied by decreases (increases) in the number of multi‐day wet (dry) spells. This future shift in multi‐day episodes also lowers down the likelihood of short dry spell occurrence in all of the models. The models further project a higher mean precipitation intensity in spring and autumn north of the Alps, whereas a similar tendency is expected for the winter season over most of Switzerland.
Ring‐Opening Metathesis Polymerization of 18‐e Cobalt(I)‐Containing Norbornene and Application as Heterogeneous Macromolecular Catalyst in Atom Transfer Radical Polymerization
Authors: Yan Yi , Zhang Jiuyang , Wilbon Perry , Qiao Yali , Tang Chuanbing 
Published: September 2014

In the last decades, metallopolymers have received great attention due to their various applications in the fields of materials and chemistry. In this article, a neutral 18‐electron exo‐substituted η4‐cyclopentadiene CpCo(I) unit‐containing polymer is prepared in a controlled/“living” fashion by combining facile click chemistry and ring‐opening meta­thesis polymerization (ROMP). This Co(I)‐containing polymer is further used as a heterogeneous macromolecular catalyst for atom transfer radical polymerization (ATRP) of methyl methacrylate and styrene.
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