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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 175-178 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of β,γ-Unsaturated Ketones and γ-Hydoxy Carbonyl Compounds from Methyl 2-SiloxycyclopropanecarboxylatesSeveral methyl 2-siloxycyclopropanecarboxylates 5 are smoothly transformed into isomerically pure β,γ-unsaturated carbonyl compounds 10 by reduction with LiAlH4 or by addition of methyllithium followed by ring cleavage with acid. The method fails with bicyclic and phenyl-substituted starting materials. The intermediates obtained by reduction can also be treated with base affording γ-hydroxy carbonyl compounds 12 regioselectively.
    Notes: Einige 2-Siloxycyclopropancarbonsäure-methylester 5 werden durch Reduktion mit LiAlH4 oder Addition von Methyllithium sowie anschließende Ringöffnung im sauren Bereich glatt in isomerenreine β,γ-ungesättigte Carbonylverbindungen 10 übergeführt. Bei bicyclischen und phenylsubstituierten Ausgangsmaterialien versagt die Methode. Basische Ringöffnung der durch Reduktion erhaltenen Zwischenprodukte liefert regioselektiv γ-Hydroxycarbonylverbindungen 12.
    Type of Medium: Electronic Resource
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