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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1737-1748 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Symple Synthesis of Yohimbine AlkaloidsThe methyl ester 2a, a useful intermediate for the preparation of D/E-trans-and cis-anellated yohimbine alkaloids, is obtained from 1a by Dieckmann-condensation in 63% yield. Subsequent hydrogenation of the enone-system provides yohimbine (8a) and β-yohimbine (8b). On base treatment 2a rearranges to 3a which in turn is converted via 6a and 7a to the racemic, D/E-cis-anellated alkaloids alloyohimbine, α-yohimbine. 3-epi-α-yohimbine as well as the nonnaturally occurring isomers 8e,g,h, and i.
    Notes: Das zur Synthese D/E-trans-und D/E-cis-verknüpfter Yohimbinalkaloide geeignete Zwischenprodukt 2a wird aus 1a durch Dieckmann-Kondensation mit 63% Ausbeute erhalten. Anschließende Hydrierung des Enonsystems ergibt Yohimbin (8a) und β-Yohimbin (8b). Mit Basen wird 2a zu 3a umgewandelt, aus dem über 6a und 7a Alloyohimbin, α-Yohimbin, 3-Epi-α-yohimbin und die in der Natur nicht vorkommenden Isomeren 8e, g, h und i mit D/E-cis-Verknüpfung als Racemate erhalten werden.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation on the Chemistry of Berbans, III. Regiospecific Synthesis of Depyrroloyohimbinone by Dieckmann Condensation of unsaturated EstersDieckmann-ring closure of unsaturated-saturated esters (1-4) leads to products (6-10) whose stereochemistry is predominantly controlled by the configuration of the starting material. The reaction is useful for the regio-and stereoselective construction of berban derivatives.
    Notes: Untersuchungen des Dieckmann-Ringschlusses von gesättigt-ungesättigten Dicarbonsäureestern (1-4) zeigen, daß die Produkte (6-10) vor allem von der Konfiguration des Ausgangsmaterials abhängen. Die Reaktion ist zum regioselektiven und stereoselektiven Aufbau von Berban-Derivaten sehr nützlich.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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