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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 649-654 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Elaeocarpus Alkaloids Using Cyclizing Imide OlefinationsThe indolizine 3b has been synthesized by intramolecular Wittig reaction of 13a and subsequent acylation. Elaeocarpus alkaloids were obtained by reduction of 3b with LiAlH4 and subsequent oxidation.
    Notes: Das Indolizinderivat 3b wurde durch intramolekulare Wittig-Reaktion von 13a und anschließende Acylierung erhalten. Reduktion von 3b mit LiAlH4 und nachfolgende Oxidation führt zu Elaeocarpus-Alkaloiden.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Acyclic Imides with 1-Elhoxycarbonylcyclopropyltriphenylphosphonium Tetrafluoroborate: An Easy Route to 1H-Pyrrole-3-carboxylatesThe reaction of anions of the acyclic imides 1 with the cyclopropylphosphonium salt 2 yields ethyl 1-acyl-Δ2-pyrroline-3-carboxylates 3, substituted in position 2, which can be dehydrogenated to yield the corresponding 1-acylpyrroles 4 and subsequently deacylated to give the pyrroles 5. The scope of the reaction is discussed.
    Notes: Durch Umsetzung der Anionen offenkettiger Imide 1 mit dem Cyclopropylphosphoniumsalz 2 werden 2-substituierte 1-Acyl-Δ2-pyrrolin-3-carbonsäure-ethylester 3 erhalten, die zu den entsprechenden 1-acylierten 3-Pyrrolcarbonsäureestern 4 dehydriert und anschließend zu Pyrrolen 5 de-acyliert werden. Die Anwendungsbreite der Reaktionsfolge wird beschrieben.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 695-704 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diastereoselective Syntheses of rac-Slaframine and rac-6-epi-SlaframineIndolizidinones 8 have been obtained from thalidomide (5) and cyclopropylphosphonium salts 6 in good yields. Acid-catalyzed rearrangement of 8a gave the isomer 11. A regio- and stereoselective acetoxylation of 8a and 11 was achieved with lead tetraacetate: using standard conditions, acetates 15 and 16 were obtained; in the presence of triethylamine, however, 8a has been transformed into the acetoxy derivative 17. rac-6-epi-Slaframine (4) and rac-slaframine (1) were obtained from acetates 16 and 17 on conventional routes.
    Notes: Indolizidinone 8 wurden aus Thalidomid (5) und Cyclopropylphosphoniumsalzen 6 in guten Ausbeuten erhalten. 8a ließ sich mit Säuren zu 11 isomerisieren. Eine regio- und stereoselektive Acetoxylierung von 8a und 11 gelang mit Blei(IV)-acetat: unter den üblichen Bedingungen entstanden die Acetate 15 und 16; in Gegenwart von Triethylamin reagierte 8a jedoch zum Acetoxyderivat 17. rac-6-epi-Slaframin (4) und rac-Slaframin (1) wurden aus 16 und 17 auf konventionellen Wegen erhalten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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