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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1101-1110 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Synthesis of 5α-Stigmasta-22,25-dien-3β-ol, 5α-Stigmast-22-en-3β-ol und 5α-Stigmastan-3β-ol and their 24-EpimersThe synthesis of the title compounds from butynylcarbinols 5 with 1-dimethylamino-1-methoxy-1-propene in a Claisen rearrangement via the amides 7 is described. An effective preparation of the starting materials is given and the data of the products are compared with those from natural sterols.
    Notes: Die Synthese der Titelverbindungen aus den Butinylcarbinolen 5 mit 1-Dimethylamino-1-methoxy-1-propen in einer Claisen-Umlagerung über die Amide 7 wird beschrieben. Eine effektive Darstellung der Ausgangsverbindungen wird angegeben, und die Daten der Produkte werden mit den aus Naturstoffen gewonnenen verglichen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2236-2245 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Synthesis of (24S)- and (24R)-24-Ethylcholesta-5,22,25-triene-3β-ol as well as of Poriferasterol and StigmasterolThe synthesis of the naturally occurring (24S)-24-ethylcholesta-5,22,25-triene-3β-ol ((24S)-1a) and its (24R)-epimer from butynylcarbinols 2 with 1-dimethylamino-1-methoxy-1-propene in a Claisen rearrangement via the amides 4 is described. The stereochemistry of all intermediates and by-products is determined. The known hydrogenation of the products 1 leads to poriferasterol ((24R)-8a) and stigmasterol ((24S)-8a), respectively.
    Notes: Die Synthese des natürlich vorkommenden (24S)-24-Äthylcholesta-5,22,25-trien-3β-ols ((24S)-1a) und seines (24R)-Epimeren aus den Butinylcarbinolen 2 mit 1-Dimethylamino-1-methoxy-1-propen in einer Claisen-Umlagerung über die Amide 4 wird beschrieben. Die Stereochemie aller Zwischen- und Nebenprodukte wird geklärt. Die bekannte Hydrierung der Produkte 1 führt zu Poriferasterin ((24R)-8a) bzw. Stigmasterin ((24S)-8a).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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