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Showing 1 to 17 of 17 for “"Pyranose"”.
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Molecular studies of organometallic carbohydrates and related compounds.
… stannylated carbohydrates were studied (three pyranose and two furanose compounds). l,2;3,4-di-O-isopropylidene-6-O-triphenylstannylmethyl-alpha-D-galactopyranose shows the tin in a distorted tetrahedral environment and the pyranose ring in a twist-boat conformation. Only slight changes in …
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Brønsted acid-catalyzed stereoselective allylation of exo-glycals with allyltrimethylsilane
… manner to afford α-allyl substituted pyranose.
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Methods for the Study of Galactofuranose in Mycobacteria
… deploying furanose sugars over their more stable pyranose counterparts, galactofuranose is prevalent across nature from commensals to human pathogens. However, it is conspicuously absent from human cells, thus establishing its biosynthetic pathways as important potential drug targets. Our …
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Synthesis And Á-Stereoselective Sialylation Of Kdn And Late Stage Modification Of Neuraminic Acid Sialosides
… of a 4,5-O-carbonate group installed on the pyranose ring. The 4,5-O-carbonate moiety proved to be an excellent á-directing group in sialylation for a wide array of acceptors independent of the anomeric configuration of the donor, and provided high yields by inhibiting the glycal formation. …
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Synthesizing a Heparin Mimic Material Derived from Cellulose Nanocrystals
… nanocrystals (CNCs) contain the same 1,4 linked pyranose backbone structure as heparin along with desirable mechanical properties, like high stiffness and anisotropic shape. By altering the functionalization on the surface of CNCs to closely mirror that of heparin, it should be possible to make a …
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Water dynamics about selected monosaccharides in solution
… shown that the presence of a primary alcohol on pyranose based molecules induces a configuration that allows favourable interactions between water molecules and hydroxyl groups on the sugar molecules. A region of high water density is formed between the primary alcohol, ring oxygen and the …
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Synthetic methodologies toward the functionalization of benzhydrols and carbohydrates
… diastereoselectivity to the α-anomer in pyranose-based derivatives. Exo-glycals bearing alkyl, phenyl and alkynyl substituents were also well-tolerated. The scope of substrates was expanded to include mannoside, galactoside, arabinoside and riboside derivatives. As part of this study, the …
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Synthetic studies toward 6-deoxy-ß-D-ido-heptopyranosides related to capsular polysaccharides of Campylobacter jejuni
… that it imposes conformational restraint on the pyranose ring to facilitate O-transsulfonylation and also allows the subsequent opening of the intermediate epoxide to occur at a much improved rate. Finally, homologation of the β-D-idopyranoside at C-6 was studied which enabled access to two …
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Mannaric Acid and Mannaric Acid Polyamides: Synthesis and Characterization
… the common monosaccharide D-glucose, occurs in a pyranose ring form as a component of a variety of plant polysaccharides and is the third most abundant naturally occurring aldohexose after D-glucose and D-galactose, respectively. Historically, D-mannaric acid has been prepared by the nitric acid …
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Mannaric Acid and Mannaric Acid Polyamides: Synthesis and Characterization
… the common monosaccharide D-glucose, occurs in a pyranose ring form as a component of a variety of plant polysaccharides and is the third most abundant naturally occurring aldohexose after D-glucose and D-galactose, respectively. Historically, D-mannaric acid has been prepared by the nitric acid …
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Defining D-Arabinose Metabolism in <i>Leishmania major</i> and <i>Crithidia fasciculata</i>
… and bacteria. Arabinose exists naturally in both pyranose and furanose conformations and D- and L- configurations. The most abundant form of arabinose is L-arabinose which is present in the arabinogalactans of plants. D-arabinofuranose (D-Araf) is found mainly in the arabinomannans, …
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Applications of supercritical fluid technologies to the analysis of food components
… enough to determine if the structure contained a pyranose or furanose ring. Changes in chemical composition of vegetable oils due to processing were observed employing SFC/FT-IR. Refined soybean oil and soybean oil that was hydrogenated with a NI or a Ni-S catalyst were analyzed. SFC/FT-IR …
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Developing methods to construct ring pucker free energy hypersurfaces applied to the analysis of glycosidase enzyme catalytic mechanisms
… various 5- and 6-membered cycles (furanoses and pyranoses) which can twist, bend or flip into a variety of conformers that differ in strain - this is ring puckering. These puckers notably the strained puckering conformers are observed during enzymatically assisted bond formation or cleavage of …
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Towards the Synthesis of the Unusual Monosaccharides Found in the Shigella sonnei O-Antigen and Analysis of Shigella flexneri 2a Glycoconjugate Vaccine Samples
… of 2-acetamido-4-amino-2,4,6-trideoxy-β-D-galactopyranose (FucNAc4N/AAT) and 2-acetamido2-deoxy-α-L-altruronic acid (AltNAcA), the two unusual monosaccharides found in the repeating unit of the Shigella sonnei O-antigen. Since these sugars are not commercially available, synthetic derivatives are …
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Polyolato-Komplexe mit Kupfer(II) und Palladium(II)
… mit einem reduzierenden Zucker in der Pyranose-Form strukturell charakterisiert werden. Die Lösungen dieser Zucker in Pd-en wurden mit Hilfe der zweidimensionalen NMR-Spektroskopie untersucht und der Anteil von den jeweiligen verschiedenen vorhandenen Konfigurationen der Zucker in …
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Influence of head-moisture treatment on functional, colour and thermal properties of bambara ground-nut starch
… due to the skeletal vibrations of the glucose pyranose ring. Statistical analysis on colour, thermal and functional properties of HMT 15-BG, HMT 25-BG and HMT 35-BG starch showed that effects of temperature and treatment time had no significant (p ≥ 0.05) effect on these properties of HMT-BG …
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Oxidative Treatment of Emerging Micropollutants and Viral Pathogens by Potassium Permanganate and Ferrate: Kinetics and Mechanisms
… ring and thioether group attached to the pyranose ring. TMP oxidation by Mn(VII) was proposed to occur at the C=C bonds on the pyrimidine ring and the bridging methylene group. EE2 oxidation by Mn(VII) resulted in several types of products, including dehydrogenated EE2, hydroxylated EE2, …