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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 870-900 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Total Synthesis of Cephalosporin Derivatives, I. - Synthesis of trans-3-Sulfonyloxy-4-alkylthio-2-azetidinonesThe reaction of sulfonyloxyacetyl chlorides 1 with thioformimidates 2 in the presence of triethylamine yields trans-3-sulfonyloxy-4-alkylthio-2-azetidinones 3. These new β-lactam derivatives are also prepared by the reaction of acyloxyacetyl chlorides 8 with thioformimidates 2 to give 3-acyloxy-2-azetidinones 9. Subsequent saponification affords 3-hydroxy compounds 10 which are esterified with sulfonyl chlorides. Ozone oxidation of unsaturated residues in these β-lactams leads to the corresponding carbonyl derivatives. The reaction of Δ2-thiazolines and 5,6-dihydro-4H-1,3-thiazines with sulfonyloxyacetyl chlorides to yield bicyclic β-lactam derivatives is also described.
    Notes: Sulfonyloxyacetylchloride 1 reagieren mit Thioimidsäureestern 2 in Gegenwart von Triäthylamin zu trans-3-Sulfonyloxy-4-alkylthio-2-azetidinonen 3. Ein weiterer Weg zu dieser neuen Klasse von β-Lactamderivaten besteht in der Reaktion von Acyloxyacetylchloriden 8 mit Thioimidsäureestern 2, Verseifung der gebildeten 3-Acyloxy-2-azetidinone 9 zu den 3-Hydroxyverbindungen 10 und deren Veresterung mit Sulfonsäurechloriden. Ungesättigte Reste an Schwefel und Stickstoff in den dargestellten β-Lactamen werden mit Ozon unter Bildung von Carbonylfunktionen oxidiert. Die Reaktion von Δ2-Thiazolinen und 5,6-Dihydro-4H-1,3-thiazinen mit Sulfonyloxyacetylchloriden zu bicyclischen β-Lactamderivaten wird beschrieben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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