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  • Sparteine  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 197-201 
    ISSN: 0170-2041
    Keywords: Didehydrosparteine ; Lupanine ; Sparteine ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2,3-DidehydrosparteineReduction of lupanine [(+)-6 or (→)-6] by use of diisobutylaluminium hydride (DIBAH) directly affords (+)-2,3-didehydrosparteine [(+)-3] and crystalline (±)-3, respectively, in 70% yield. The conjugate acid of 3 (iminium salt 2) is relatively stable and readily adds cyanide to give 2β-sparteinecarbonitrile (8). On the contrary, enamine 3 undergoes thermal 2±3′ dimerisation to give a diastereomeric mixture of 7. The identity of the title compound 3 with the major metabolite of (-)-sparteine (1) has been proven by use of gas chromatography/mass spectrometry.
    Notes: Die Reduktion von Lupanin [(+)-6 oder (→)-6] mit Diisobutylaluminiumhydrid (DIBAH) liefert in 70% Ausbeute direkt (+)-2,3-Didehydrospartein [(+)-3] bzw. kristallines Racemat (±)-3. Die konjugate Säure von 3 (Iminium-Salz 2) ist relativ stabil und addiert leicht Cyanid zu 2β-Sparteincarbonitril (8). Dagegen reagiert das Enamin 3 unter thermischer 2→3′-Dimerisierung zu einem Diastereomerengemisch von 7. Die Identität der Titelverbindung 3 mit dem Hauptmetaboliten von (-)-Spartein (1) wird durch Gaschromatographie/Massenspektrometrie belegt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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