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  • 1975-1979  (26)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3825-3836 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XXXI Stereoselective Total Syntheses of GeissoschizineStereoselective techniques of the construction of the sp2- as well as the sp3-hybridized centers of geissoschizine (1) are reported. The exocyclic E-configurated double bond may principally be installed by an elimination process, higher stereoselectivity is gained by an α-methylene lactame rearrangement.
    Notes: Es werden stereoselektive Techniken zum gezielten Aufbau der sp2 - und der sp3-hybridisierten Zentren des Geissoschizins (1) angegeben. Die exocyclische E-konfigurierte Doppelbindung kann prinzipiell über einen Eliminierungsprozeß, mit ausgeprägter Stereoselektivität jedoch über eine α-Methylen-Lactam-Umlagerung eingeführt werden.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 146-153 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with 4-Acetoxy-2-cyclopenten-1-oneBy using 4-acetoxy-2-cyclopenten-1-one (8) as a synthone for the non-existent cyclopentadienone (5), Michael additions are performed that give rise to trans-disubstituted cyclopentanone derivatives (11,12). In the case of tert-butyl acetoacetate as Michael donator the addition to 11 is followed by an aldol-cyclisation to the trans-perhydroazulene system 22.
    Notes: Unter Verwendung von 4-Acetoxy-2-cyclopenten-1-on (8) als Synthon für das nicht existenzfähige Cyclopentadienon (5) wurden Michael-Additionen durchgeführt, die zu trans-disubstituierten Cyclopentanon-Derivaten (11, 12) führen. Bei Verwendung von tert-Butyl-acetacetat als Michael-Donator schließt sich an die Addition zu 11 eine Aldolcyclisierung zum trans-Perhydroazulensystem 22 an.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 243-247 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction with Indole Derivatives, Yohimbone Derivatives on Enamine CyclisationStarting from the ketoester pentacyclic yohimbone- and 3-epi-yohimbone derivatives are obtained via enamine cyclisation.
    Notes: Ausgehend vom Ketoester 4 erhält man über eine Enamin-Cyclisierung Yohimbon- und 3-epi-Yohimbonderivate.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 248-259 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XXV, The Stereoselective Total Synthesis of Roxburghin DThe biogenetically interesting, octacyclic indole alkaloid roxburghin D can be synthesized stereoselectively from a configuratively pure intermediate. The steric course of the decisive cyclisation reaction is disclosed by means of model substances.
    Notes: Das biogenetisch interessante, octacyclische Indolalkaloid Roxburghin D kann, ausgehend von einem sterisch einheitlichen Zwischenprodukt, stereoselektiv aufgebaut werden. Der sterische Verlauf der entscheidenden Cyclisierungsreaktion wird unter Verwendung von Modellsubstanzen geklärt.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2424-2432 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XXXIII. A Simple and Biogenetically Orientated Total Synthesis of Brevicolline and BrevicarineA simple synthesis of a pyrrolidine-substituted tryptamine (6) is reported which is serving as a starting material for brevicolline (1) as well as brevicarine (2). The biogenetical interrelations are discussed.
    Notes: Es wird eine einfache Synthese für ein pyrrolidinsubstituiertes Tryptamin (6) beschrieben, das als Ausgangsmaterial zur Synthese für sowohl Brevicollin (1) als auch Brevicarin (2) dienen kann. Die biogenetischen Zusammenhänge werden diskutiert.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1540-1548 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XXXV: The Dependance of the Methylene Lactam Rearrangement on the ConfigurationIndoloquinolizidines having trans-orientated hydrogens at C-3 and C-15 are shown to rearrange highly stereoselectively into unsaturated lactams with an E-configurated exocyclic double bond.
    Notes: Es wird gezeigt, daß Indolochinolizidin-Systeme mit trans-ständigen Wasserstoffen an C-3 und C-15 mit hoher Stereoselektivität die α-Methylen-Lactam-Umlagerung zu ungesättigten Lactamen mit E-konfigurierter exocyclischer Doppelbindung absolvieren.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1791-1802 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XXVI. The Steric Course of Methylene-Lactam Rearrangements in Rigid Policyclic SystemsThe four stereoisomeric, disubstituted indoloquinolizindines of type 12 have been prepared in a stereoselective manner and then treated according to the methylene-lactam rearrangement. In all cases the exocyclic double-bound with E-configuration is obtained. This type of configuration is found in many indole-alkaloids.
    Notes: Alle vier stereoisomeren, disubstituierten Indolochinolizidine des Typs 12 wurden mit Hilfe stereoselektiver Techniken dargestellt und der Methylen-Lactam-Umlagerung unterworfen. In allen Fällen wird die E-konfigurierte exocyclische Doppelbindung erhalten, ein Konfigurationstyp, der in vielen Indolalkaloiden angetroffen wird.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1803-1806 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XXVII. Configuration Assignment of Angular Substituted IndoloquinolizinesThe application of spectroscopic data of angular substituted indoloquinolizines for configuration assignment is discussed.
    Notes: Es werden die spektroskopischen Daten angulär substituierter Indolochinolizin-Derivate auf Anwendbarkeit bei der Konfigurationszuweisung überprüft.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3030-3042 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XXVIII. Alkylation of Camptothecin-Intermediates-a New Approach to CamptothecinBy using ring-open intermediates the ethyl-group of camptothecin is introduced in high yield. Some further improvements of the synthesis are reported.
    Notes: Unter Verwendung ringoffener Vorstufen gelingt die Einführung der Äthylgruppe des Camptothecins in guter Ausbeute. Über einige Verbesserungen des Synthesewegs wird berichtet.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1389-1394 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Camptothecine OxidationThe scope and the selectivity of the autoxidative transformation of deoxycamptothecine- into camptothecine derivatives are investigated.
    Notes: Die Anwendungsbreite und die Selektivität der autoxidativen Überführung von Desoxycamptothecin- in Camptothecinderivate wird untersucht.
    Type of Medium: Electronic Resource
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