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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1980 (1980), S. 1307-1320 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Total Synthesis of 2,5-Diamino-2,5-dideoxyriboseThe enantiomeric 2,5-diacetylamino-2,5-dideoxyriboses 11A and 11B are obtained via cycloaddition of diacylazo compounds with 2,4-pentadienal acetal 2 and diastereoselective cis-dihydroxylation of the cycloadducts 3a-c in a few steps. Resolution of the racemic N-unprotected 2,5-diaminodideoxyribose derivative 9 was achieved easily with the aid of (+)- or (-)-tartaric acid. The relative configuration of the hexahydropyridazine intermediates 5 was established by 1H-NMR data of the di-O-acylated derivatives 14a, b.
    Notes: Durch Cycloaddition von Diacylazoverbindungen an 2,4-Pentadienal-acetal 2 und diastereoselektive cis-Dihydroxylierung der Cycloaddukte 3a-c wurden in wenigen Reaktionsstufen die enantiomeren 2,5-Diacetylamino-2,5-didesoxyribosen 11A und 11B erhalten. Die Racemattrennung erfolgte bequem auf der Stufe der N-ungeschützten Diaminoverbindung 9 mit Hilfe von (+)-oder (-)-Weinsäure. Die relativen Konfigurationen der Hexahydropyridazin-Zwischenverbindungen 5 wurden über die di-O-acylierten Derivate 14a und b 1H-NMR-spektroskopisch ermittelt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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