Category: 14215-68-0

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Synthesis of cellobiose-containing oligosaccharides by intermolecular transglucosylation of cyclodextrin glycosyltransferase from Paenibacillus sp. A11

Intermolecular transglucosylation of cyclodextrin glycosyltransferase (CGTase) was investigated for its use in oligosaccharide synthesis. From the kinetic parameters of the CGTase-catalyzed transglucosylation reaction, using beta-cyclodextrin (beta-CD) as the glucosyl donor and various saccharides or derivatives as acceptors, the efficient acceptors of the Paenibacillus sp. A11 enzyme were glucose, sorbose, lactose and cellobiose. Amongst these acceptors, cellobiose showed the highest kcat/Km value. The transglucosylation yields of the reactions for cellobiose, sorbose and glucose acceptors were 78, 57 and 54%, respectively, making cellobiose the most efficient acceptor of the tested saccharides in coupling with beta-CD. The optimal condition for the coupling reaction was determined as: 2% (w/v) beta-CD and 0.5% (w/v) cellobiose, incubated with 64 U/mL of CGTase at 30 C for 2 h. Two main transfer products detected by HPLC, PC1 and PC2, with retention times of 3.81 and 4.42 min, respectively, and a product ratio of 3:1, had a molecular mass of 504 and 666 Da, respectively, as analyzed by mass spectrometry. The structures suggested by NMR were a trisaccharide and a novel tetrasaccharide-containing cellobiose of the structures glc (alpha1 ? 4) glc (beta1 ? 4) glc and glc (alpha1 ? 4) glc (alpha1 ? 4) glc (beta1 ? 4) glc, respectively. The products were found to be resistant to hydrolysis by alpha-amylase.

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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

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3-(Dimethylamino)-1-propylamine: A cheap and versatile reagent for removal of byproducts in carbohydrate chemistry

Inexpensive 3-(dimethylamino)-1-propylamine (DMAPA) was found to be effective in anomeric deacylation reactions giving 1-O deprotected sugars in high yield as precursors for the formation of imidate glycosyl donors. DMAPA was also found to be useful for removing excess reagents such as benzoyl chloride, tosyl chloride, and 2,2,2-trifluoro-N-phenylacetimidoyl chloride. The deacylation reaction could be conducted in moist THF and did not require chromatographic purification since an acidic wash was sufficient to remove excess reagent and the formed byproduct.

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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 14215-68-0, Name is N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide, molecular formula is C8H15NO6. In a Article£¬once mentioned of 14215-68-0, Recommanded Product: N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide

Synthesis of UDP-6-deoxy- and 6-fluoro-D-galactoses and their enzymatic glycosyl transfer to mono- and biantennary carbohydrate chains

Glycosylation with chemically prepared UDP-6-deoxy-D-galactose and its 6-fluoro analog using bovine (1-4)-beta-D-galactosyltransferase was demonstrated to be effective enough for practical purposes. A biantennary pentasaccharide having two 6′-deoxylactosamine residues was synthesized.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Recommanded Product: N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 14215-68-0, in my other articles.

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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

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Glycosynthase with broad substrate specificity-an efficient biocatalyst for the construction of oligosaccharide library

A versatile glycosynthase (TnG-E338A) with strikingly broad substrate scope has been developed from Thermus nonproteolyticus beta-glycosidase (TnG) by using site-directed mutagenesis. The practical utility of this biocatalyst has been demonstrated by the facile generation of a small library containing various oligosaccharides and a steroidal glycoside (total 25 compounds) in up to 100 % isolated yield. Moreover, an array of eight gluco-oligosaccharides has been readily synthesized by the enzyme in a one-pot, parallel reaction, which highlights its potential in the combinatorial construction of a carbohydrate library that will assist glycomic and glycotherapeutic research. Significantly, the enzyme provides a means by which glycosynthase technology may be extended to combinatorial chemistry.

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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Application of 14215-68-0, An article , which mentions 14215-68-0, molecular formula is C8H15NO6. The compound – N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide played an important role in people’s production and life.

Glycosylidene Carbenes Part 4 Synthesis of Spirocyclopropanes from Acetamidoglycosylidene-Derived Diazirines

The synthesis of the first glycosylidene-derived 2-acetamido-2-deoxydiazirine 4 from N-acetylglucosamine 6 is described.Thus, 6 was transformed into the 3-O-mesylglucopyranoside 9 by glycosidation with allyl alcohol, benzylidenation, and mesylation (Scheme 2).Solvolysis of 9 gave the allopyranoside 10 which, upon benzylation and glycoside cleavage, yielded the hemiacetals 12.Using our established method (via the lacton oxime 14 and the diaziridines 16), 12 gave the diazirine 4.Thermolysis of this diazirine in the presence of i-PrOH gave the dihydro-1,3-oxazole 5 (Scheme 1); in the presence of acrylonitrile, the four diastereomeric spirocyclopropanes 17-20 and the acetamidoallal 21 were obtained and separated by prep.HPLC (Scheme 3).Assignment of the configuration of 17-20 is based on NOE measurements and on the effect of diamagnetic anisotropy of the CN group.The ratio of the four cyclopropanes, which is in keeping with earlier results, is rationalized.

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Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Electric Literature of 14215-68-0, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.14215-68-0, Name is N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide, molecular formula is C8H15NO6. In a patent, introducing its new discovery.

Multiplexed azido-group isotopic capture (MAGIC) beads: Selective analysis of azido compounds using a propargyl-based cleavable linker, a proof of concept

Rationale: A cleavable linker is designed and synthesized for the selective capture of azide-containing compounds. This article presents a proof of concept methodology involving the use of peptide-functionalized aminopropyl silica, on which the peptide is constructed by solid-phase peptide synthesis. Methods: The peptide linker has L-propargylglycine (Pra) at one terminal end to allow the conjugation of azide-containing molecules by copper assisted azide alkyne cycloaddition, also known as click reaction. L-Arginine (Arg) is placed just before Pra to permit the release of the captured product by tryptic cleavage. Three glycine (Gly) residues, as part of the linker, are appended to the silica bead to present a spacer section that allows efficient tryptic cleavage devoid of steric hindrance imposed by the bulky bead. The bead composition is Si-O-propyl-NH-Gly-Gly-Gly-Arg-Pra. Results: This solid-phase material can be used to capture and release azide-functionalized compounds. The beads are first tested on three azido compounds, 2-azido-2-deoxyglucose (ADG), BOC-p-azido-Phe-OH (BAzPhe), where BOC?=?tert-butoxycarbonyl, and tetraacetylated-N-azidomannosamine (Ac4ManNAz). Copper-mediated click reaction conditions are used and released products are characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) and tandem MS (MS/MS). Conclusions: This method allows easy identification of captured compounds based on mass and fragmentation analysis. Moreover, it is useful for the analysis of small azide-containing compounds by MALDI-TOF-MS which may not be possible otherwise due to matrix interferences. The insertion of isotopically labeled Arg residues provides the possibility of multiplex analysis, from which the beads have been called MAGIC (for Multiplexed Azido-Group Isotopic Capture). Copyright

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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Synthetic Route of 14215-68-0, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 14215-68-0, Name is N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide, molecular formula is C8H15NO6. In a Article£¬once mentioned of 14215-68-0

Glycosynthase with broad substrate specificity-an efficient biocatalyst for the construction of oligosaccharide library

A versatile glycosynthase (TnG-E338A) with strikingly broad substrate scope has been developed from Thermus nonproteolyticus beta-glycosidase (TnG) by using site-directed mutagenesis. The practical utility of this biocatalyst has been demonstrated by the facile generation of a small library containing various oligosaccharides and a steroidal glycoside (total 25 compounds) in up to 100 % isolated yield. Moreover, an array of eight gluco-oligosaccharides has been readily synthesized by the enzyme in a one-pot, parallel reaction, which highlights its potential in the combinatorial construction of a carbohydrate library that will assist glycomic and glycotherapeutic research. Significantly, the enzyme provides a means by which glycosynthase technology may be extended to combinatorial chemistry.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 14215-68-0 is helpful to your research., Synthetic Route of 14215-68-0

Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Reference of 14215-68-0, An article , which mentions 14215-68-0, molecular formula is C8H15NO6. The compound – N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide played an important role in people’s production and life.

Glycosylidene Carbenes Part 4 Synthesis of Spirocyclopropanes from Acetamidoglycosylidene-Derived Diazirines

The synthesis of the first glycosylidene-derived 2-acetamido-2-deoxydiazirine 4 from N-acetylglucosamine 6 is described.Thus, 6 was transformed into the 3-O-mesylglucopyranoside 9 by glycosidation with allyl alcohol, benzylidenation, and mesylation (Scheme 2).Solvolysis of 9 gave the allopyranoside 10 which, upon benzylation and glycoside cleavage, yielded the hemiacetals 12.Using our established method (via the lacton oxime 14 and the diaziridines 16), 12 gave the diazirine 4.Thermolysis of this diazirine in the presence of i-PrOH gave the dihydro-1,3-oxazole 5 (Scheme 1); in the presence of acrylonitrile, the four diastereomeric spirocyclopropanes 17-20 and the acetamidoallal 21 were obtained and separated by prep.HPLC (Scheme 3).Assignment of the configuration of 17-20 is based on NOE measurements and on the effect of diamagnetic anisotropy of the CN group.The ratio of the four cyclopropanes, which is in keeping with earlier results, is rationalized.

I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 14215-68-0, help many people in the next few years., Reference of 14215-68-0

Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Application of 14215-68-0, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.14215-68-0, Name is N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide, molecular formula is C8H15NO6. In a patent, introducing its new discovery.

Multiplexed azido-group isotopic capture (MAGIC) beads: Selective analysis of azido compounds using a propargyl-based cleavable linker, a proof of concept

Rationale: A cleavable linker is designed and synthesized for the selective capture of azide-containing compounds. This article presents a proof of concept methodology involving the use of peptide-functionalized aminopropyl silica, on which the peptide is constructed by solid-phase peptide synthesis. Methods: The peptide linker has L-propargylglycine (Pra) at one terminal end to allow the conjugation of azide-containing molecules by copper assisted azide alkyne cycloaddition, also known as click reaction. L-Arginine (Arg) is placed just before Pra to permit the release of the captured product by tryptic cleavage. Three glycine (Gly) residues, as part of the linker, are appended to the silica bead to present a spacer section that allows efficient tryptic cleavage devoid of steric hindrance imposed by the bulky bead. The bead composition is Si-O-propyl-NH-Gly-Gly-Gly-Arg-Pra. Results: This solid-phase material can be used to capture and release azide-functionalized compounds. The beads are first tested on three azido compounds, 2-azido-2-deoxyglucose (ADG), BOC-p-azido-Phe-OH (BAzPhe), where BOC?=?tert-butoxycarbonyl, and tetraacetylated-N-azidomannosamine (Ac4ManNAz). Copper-mediated click reaction conditions are used and released products are characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) and tandem MS (MS/MS). Conclusions: This method allows easy identification of captured compounds based on mass and fragmentation analysis. Moreover, it is useful for the analysis of small azide-containing compounds by MALDI-TOF-MS which may not be possible otherwise due to matrix interferences. The insertion of isotopically labeled Arg residues provides the possibility of multiplex analysis, from which the beads have been called MAGIC (for Multiplexed Azido-Group Isotopic Capture). Copyright

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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 14215-68-0, Name is N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide, molecular formula is C8H15NO6. In a Article£¬once mentioned of 14215-68-0, name: N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide

Catalytic Depolymerization of Chitin with Retention of N-Acetyl Group

Chitin, a polymer of N-acetylglucosamine units with beta-1,4-glycosidic linkages, is the most abundant marine biomass. Chitin monomers containing N-acetyl groups are useful precursors to various fine chemicals and medicines. However, the selective conversion of robust chitin to N-acetylated monomers currently requires a large excess of acid or a long reaction time, which limits its application. We demonstrate a fast catalytic transformation of chitin to monomers with retention of N-acetyl groups by combining mechanochemistry and homogeneous catalysis. Mechanical-force-assisted depolymerization of chitin with a catalytic amount of H2SO4 gave soluble short-chain oligomers. Subsequent hydrolysis of the ball-milled sample provided N-acetylglucosamine in 53 % yield, and methanolysis afforded 1-O-methyl-N-acetylglucosamine in yields of up to 70 %. Our process can greatly reduce the use of acid compared to the conventional process.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.name: N-((2S,3R,4R,5R,6R)-2,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)acetamide. In my other articles, you can also check out more blogs about 14215-68-0

Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics