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  • Aminoglycosides
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1729-1743 
    ISSN: 0009-2940
    Keywords: Antibiotics, aminoglycoside ; Sannamine building blocks ; Aminoglycosides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aminoglycosid-Antibiotika - Enantiomerenreine Sannamin-BausteineAusgehend vom prochiralen Dianhydrodesoxy-epi-inosit 9 wurde eine leistungsfähige Synthese für enantiomerenreine rac-Sannamine (1, Salze, Derivate) und rac-Des-O-methylsannamin (18, Salz) ausgearbeitet. Essentielle Schritte sind zwei regiospezifische, praktisch quantitative Epoxidöffnungen: Intramolekular in den Diepoxyurethanen 11 und intermolekular in den Epoxyurethanen rac-13. Mit (R)-1-Phenylethylamin als potentieller primärer Aminogruppe im zweiten Schritt gelingt die Diastereomerentrennung (16, 16′) ohne signifikante Verluste. Es werden direkt enantiomerenreine (Des-O-methyl)Sannamin-Derivate gewonnen, in welchen alle Substituenten bis auf die zu glycosidierende OH-Gruppe geschützt sind. Versuche zur asymmetrischen Durchführung der Synthese brachten nur bescheidene ee(de)-Werte.
    Notes: Starting from the prochiral dianhydrodeoxy-epi-inositol 9 a highly efficient synthesis for rac-sannamines (1, salts, derivatives) and rac-de-O-methylsannamine (18, salt) has been developed. Key steps are two regiospecific, practically quantitative epoxide opening reactions: intramolecularly in the diepoxyurethanes 11 and intermolecularly in the epoxyurethanes rac-13. With (R)-1-phenyl-ethylamine as potential primary amino group in the second step separation of the corresponding diastereomers (16, 16′) is achieved without significant loss of material. By this route enantiomerically pure (de-O-methyl)sannamines become available in which all functionalities are protected except that to be glycosidated. Attempts for an asymmetric realization of this synthesis resulted in only very small ee(de) values.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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