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  • 1
    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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