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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 876-884 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2′-Deoxytubercidin - Synthesis of a 2-Deoxyadenosine Isoster by Phase-Transfer Glycosylation2′-Deoxytubercidin (1), an isoster of 2′-deoxyadenosine (2), has been synthesized omitting naturally occurring synthons via phase-transfer glycosylation of the chromophore 3a with the toluoyl-protected halogenose 6. The glycosylation reaction produces the β-anomer exclusively. Alkaline hydrolysis of the protecting groups of 5a yields 2′-deoxy-2-(methylthio)tubercidin (5b). Desulfurization with Raney nickel catalyst gives 2′-deoxytubercidin (1). The position of glycosylation has been determined by 13C NMR spectroscopy using the long-range coupling constant between C-6 and 1′-H and was found to be N-7.
    Notes: 2′-Desoxytubercidin (1), ein Isoster des 2′-Desoxyadenosins (2), wurde durch Phasentransfer-glycosylierung des Chromophors 3a mit der toluoylgeschützten Halogenose 6 unter Umgehung natürlicher Vorstufen dargestellt. Bei der Glycosylierung entsteht nur das β-Anomer. Nach alkalischer Hydrolyse der Schutzgruppen von 5a wird 2′-Desoxy-2-(methylthio)tubercidin (5b) erhalten, das nach Entschwefeln mit Raney-Nickel die Titelverbindung 1 ergibt. Die Glycosylierungsposition N-7 konnte mit Hilfe der 13C, 1H-NMR-Fernkopplung zwischen C-6 und 1′-H festgelegt werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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