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  • 1
    Publication Date: 1981-01-01
    Print ISSN: 0040-4039
    Electronic ISSN: 1873-3581
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3126-3145 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Building Units for Oligosaccharides, XXXII. Syntheis of the Branched Pentasaccharide Unit of the O-Specific Side Chain of the Lipopolysaccharide Obtained from Shigella dysenteriaeThe Branched pentasaccharide sequence 43 was synthesized. This is the repeating-Unit of the O-Specific side chain belonging to the lipopolysaccharide obtained from Shigella Dysenteriae of serotype two. A trisaccharide halide block, obtained from three 2-azido-sugars, was combined with a disaccharide block to give the pentasaccharide. Each combination step of the synthesis gave α-glycosides stereoselectively. The efficiencies of the azide procedure, our routes to α-glycosides and the titanium tetrabromide halogenation method are shown here.
    Notes: Die verzweigte Pentasaccharid-Sequenz 43, welche die repeating-unit der O-spezifischen Seiten-kette des Lipopolysaccharides von Shigella Dysenteriae der Serotype zwei darstellt, wurde synthetisiert. Dabei wird ein Trisaccharidhalogenid-Block aus drei 2-Azido-Zuckern mit einem Disaccharid-Block zum Pentasaccharid verknüpft. Bei allen Verknüpfungsschritten werden stereoselektiv α-glycosidische Bindungen hergestellt. Das Azidverfahren, unsere Leitlinien zur α-Glycosidsynthese und die Halogenierungsmethode mit Titantetrabromid haben hierbei ihre Leistungsfähigkeit bewiesen.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3484-3496 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Branched-chain Sugars, XXIII: Oct-2-ulosonic Acids via 1,4-Addition from Hex-1-enopyran-3-ulosesWith ethyl 2-lithio-1,3-dithiolane-2-carboxylate (2) 1,5-anhydro-4,6-O-benzylidene-2-deoxy-D-erythro-ex-1-en-3-ulose (1) yields oct-2-ulosonic acids 3 and 6 via 1,4-addition. In 6 configuration of C-6 is inversed during reaction. The structure of 6 is established by X-ray analysis. By a sequence of reduction and deblocking steps oct-2-uloses are obtained: from 3 D-allo- and D-gluco- 10 and 14, from 6 D-talo- and D-ido-compounds 18 and 22. With methylamine and dimethylamine enone 1 yields ringopened enamino ketones 23 and 24.
    Notes: 1,5-Anhydro-4,6-O-benzyliden-2-desoxy-D-erythro-hex-1-en-3-ulose (1) reagiert mit 2-Lithio-1,3-dithiolan-2-carbonsäure-ethylester (2) unter 1,4-Addition zu den Oct-2-ulosonsäuren 3 und 6. In 6 wird die Konfiguration an C-6 während der Reaktion umgekehrt. Die Struktur von 6 wird durch Röntgenstrukturanalyse gesichert. Durch eine Folge von Reduktions- und Deblockierungsschritten werden aus 3 und 6 Oct-2-ulosen erhalten: aus 3 die D-allo- und D-gluco- 10 und 14, aus 6 die D-talo- und D-ido-Verbindung 18 und 22. Das Enon 1 reagiert mit Methylamin und Dimethylamin zu ringgeöffneten Enaminketonen 23 und 24.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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