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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 775-784 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: α-Glucosidase Inhibitors, 3. - 4-Alkylamino-4,6-dideoxy Sugars via Reductive AminationAlkylamino sugars structurally derived from acarbose were obtained by reductive amination of aldehydes or ketones, respectively, and amino sugars mainly with sodium cyanotrihydroborate as reducing agent. Amino sugars investigated were the 4-amino-4,6-dideoxy-D-glucose derivative 5, the O-protected and O-unprotected 4′-amino-4′6′-dideoxymaltoside derivatives 9 and 11, and the O-protected 4′-amino-4′,6′-dideoxy-α-D-galactopyranosyl-(1→4)-α-D-glucopyranoside 16.
    Notes: Für die Synthese von (Alkylamino)zuckern, welche sich von der Struktur der Acarbose herleiten, wurden reduktive Aminierungen zwischen Aldehyden oder Ketonen und Aminozuckern vor allem mit Natrium-cyanotrihydroborat als Reduktionsmittel durchgeführt. Als Aminozucker wurden das 4-Amino-4,6-didesoxy-D-glucose-Derivat 5, die O-geschützten bzw. O-ungeschützten 4′-Amino-4′,6′-didesoxymaltosid-Derivate 9 und 11 und das O-geschützte 4′-Amino-4′,6′-didesoxy-α-D-galactopyranosyl-(1→4)-α-D-glucopyranosid 16 eingesetzt.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 1045-1054 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: α-Glucosidase Inhibitors, 5. - Investigations towards a Synthesis of C1-Branched Cyclitols from D-GlucoseThe glucose derivatives 1 and 2 were transformed by Ferrier rearrangement as one of the reaction steps into the cyclitol derivatives 3a, b and 4a, b, respectively. The attachment of a functional C1-side chain at the carbonyl group was tested with 2-lithio-1,3-dithiane, dimethylsulfoxonium methylide, and diazomethane. Compounds 7a, b and 11 were obtained as interesting reaction products. Dithioacetal formation from 3a, b, subsequent cyano/mercapto group exchange, and cyano group reduction afforded the cyclitol derivatives 19a, b as important intermediates. Oxidation, reduction, elimination, and [2,3]-sigmatropic rearrangement reactions conveniently gave the ring-saturated or -unsaturated compounds 18a, 28a, 29a, b, and 30a, b.
    Notes: Aus den Glucose-Derivaten 1 und 2 wurden u.a. durch Ferrier-Umlagerung die Cyclit-Derivate 3a, b bzw. 4a, b hergestellt. Untersuchungen zur Anknüpfung einer funktionellen C1-Seitenkette an der Carbonylgruppe wurden mit 2-Lithio-1,3-dithian, mit Dimethylsulfoxonium-methylid und mit Diazomethan durchgeführt. Als interessante Folgeprodukte wurden dabei die Cyclit-Derivate 7a, b und 11 erhalten. Dithioacetalbildung aus 3a, b anschließender Cyanid/Mercapto-Austausch und Reduktion der Cyangruppe führten zu den Cyclit-Derivaten 19a, b als wichtigen Zwischenstufen. Durch Oxidations-, Eliminierungs-, [2,3]-sigmatrope Umlagerungs- und Reduktions-Reaktionen wurden daraus die Ring-gesättigten und -ungesättigten Cyclite 18a, 28a, 29a, b und 30a, b zugänglich.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 1429-1438 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: α-Glucosidases Inhibitors, 1. - Synthesis of Modified MaltosesThe easily available phenyl maltoside 1 was selectively transformed into the partially protected compounds 2, 5, and 7-9, respectively. From the 4′,6′-unprotected maltose derivative 7 the 6′-deoxymaltoside 12 was obtained in three steps and in good yields. Double inversion of configuration of the remaining 4′-hydroxy group led via the azide 14 to the 4′-amino-4′-deoxymaltoside 16. Reaction with an allyl halide derivative yielded 18 and deprotection without affecting the CC-double bond gave the free disaccharide 19.
    Notes: Aus dem bequem zugänglichen Phenyl-maltosid 1 wurden selektiv die partiell ungeschützten Verbindungen 2, 5 und 7-9 hergestellt. Das 4′,6′-ungeschützte Maltosederivat 7 wurde in drei Stufen und in guten Ausbeuten in das 6′-Desoxymaltosid 12 übergeführt. Doppelte Konfigurationsumkehr an der verbleibenden freien 4′-Hydroxygruppe führte über das Azid 14 zum 4′-Amino-4′-desoxymaltosid 16. Umsetzung mit einem Allylhalogenidderivat zu 18 und Schutzgruppenabspaltung unter Erhaltung der CC-Doppelbindung lieferte das freie Disaccharid 19.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 26 (1987), S. 482-483 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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