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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on 1,3-Thiazines, 35. - Oxidations of Thiocarbamidates, 9(2). - Unusual Rearrangement Upon Thiocarbamoylation of Tetrahydro-2H-1,3-thiazin-2-oneDuring thiocarbamoylation of tetrahydro-2H-1,3-thiazin-2-one (4) with N,N-disubstituted thiocarbamoyl chlorides the 3-carboxamides 2 were isolated besides the expected 3-thiocarboxamides 6. The carboxamides 2 are interpreted as products of initial O-thiocarbamoylation, subsequent Newman-Kwart rearrangement, and final S → N-transcarbamoylation. Structures were ensured by independent syntheses and 13C-NMR spectroscopy. Thiocarbamidate and thiourea substructures were converted into the corresponding oxygen analogues by oxidative desulfurisation.
    Notes: Bei der Thiocarbamoylierung von Tetrahydro-2H-1,3-thiazin-2-on (4) durch N,N-disubstituierte Thiocarbamoylchloride wurden neben den erwarteten 3-Thiocarboxamiden 6 stets 3-Carboxamide 2 isoliert, die als Produkte einer O-Thiocarbamoylierung, anschließender Newman-Kwart-Umlagerung und abschließender S → N-Transcarbamoylierung interpretiert werden. Neben Struktursicherung durch unabhängige Synthesen und 13C-NMR-Spektren wurden Thionurethan- oder Thioharnstoff-Partialstrukturen durch oxidative Desulfurierung in entsprechende Sauerstoff-Analoga übergeführt.
    Type of Medium: Electronic Resource
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