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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Biologically Important Carbohydrates, 11: Synthesis and Mass Spectrometry of Forosamine (4-Dimethylamino-2,3,4,6-tetradeoxy-D-erythro-hexopyranose)An especially simple synthesis of forosamine (9) the basic tetradeoxy sugar of the spiramycins is described. trans-4,5-Epoxy-DL-threo-hex-2-enoic acid (DL-2) (from sorbic acid (1)) is resolved into the enantiomeric forms and the epoxy ring in D-2 is regioselectively opened with formation of the 4- and 5-dimethylamino-hex-2-enonic acids 3 and 4. After hydrogenation to the hexonic acids 5 and 6 and lactonisation to 7 and 8 the 4-dimethylamino-2,3,4,6-tetradeoxy-D-erythro-hexono-δ-lactone (7) is separated by chromatography. Reduction of 7 with diisobutylaluminium-hydride yields forosamine (9).
    Notes: Es wird eine besonders einfache Synthese des Forosamins (9), des basischen Tetradesoxy-Zuckers der Spiramycine beschrieben. trans-4,5-Epoxy-DL-threo-hex-2-ensäure (DL-2) (durch Epoxidierung von Sorbinsäure (1)) wird in die Enantiomeren getrennt und der Oxiranring in D-2 regioselektiv zu den 4- und 5-Dimethylamino-hex-2-enonsäuren 3 und 4 geöffnet. Nach Hydrierung zu den Hexonsäuren 5 und 6 und Lactonisierung zu 7 und 8 wird das 4-Dimethylamino-2,3,4,6-tetradesoxy-D-erythro-hexono-δ-lacton (7) abgetrennt und mit Diisobutylaluminiumhydrid zu Forosamin (9) reduziert.
    Type of Medium: Electronic Resource
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