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  • 1975-1979  (2)
  • 1979  (2)
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  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1012-1022 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Syntheses with diazodiketones, VI. Cyclic S-OxidesThe S-oxides 4 of 3,4-dihydro-1,2,3-oxathiazines and 5 of 1,2-oxazetidines are prepared a) by thermolyzing diazodiketones 1 with N-Sulfinylamines 3; b) by condensing the 2-acylacetamides 6 which are readily accessible from 1, with thionyl chloride in the presence of a basic catalyst. From 6, the aminoacrylamides 7 are obtained. These react with thionyl chloride according to the base employed, to afford either the monocyclic 3,6-dihydro-1,2,6-thiadiazine-S-osides 10 or the 4-amino-quinolines 8, presumably via the intermediacy of an imine 9. - The introduction of the SO group into (hetero)cyclic iminocarboxamides, diamines or aminophenols give rise to the S-oxides 13 of condensed thiadieazines, 15a-c of benzothiadiazole, or 15d of benzoxathiazole, respectively.
    Notes: Die 3,4-Dihydro-1,2,3-oxathiazin- 4 und 1,2-Oxazetidin-S-oxide 5 werden a) durch Thermolyse der Diazodiketone 1 mit N-Sulfinylaminen 3 b) durch basenkatalysierte Kondensation der aus 1 leicht zugänglichen 2-Acylacetamide 6 mit Thionylchlorid hergestellt. Aus 6 weden die Aminoacrylamide 7 erhalten. Diese reagieren mit Thionylchlorid je nach der verwendeten Base entweder zu monocyclischen 3,6-Dihydro-1,2,6-thiadiazin-S-oxiden 10 oder über eine Imidoylketenimin Zwischenstufe 9 zu den 4-Aminochinolinen 8. - Der SO-Einbau mittels Thionylchlorid in (hetero)-cyclische Iminocarboxamide, Diamine und Aminophenole führt zu den S-oxiden 13 kondensierter Thiadiazine, 15a-c des Benzothiadiazols bzw. 15d des Benzoxathiazols.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 3753-3758 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermolysis of 2-Diazo-1,3-diketones in the Presence of DiazoalkanesDiazodiketones 1 react with diazoalkanes 3 under the conditions of the Wolff rearrangement via the hypothetical diazonium betaines 4 predominantly by 1,4-cyclization to afford the 3-furanones 11 and enol derivatives 12. Competitively, depending on stabilizing substituents, 1,2-cyclization to the cyclopropanone 6 or the acryl ester 9 as well as cyclization without loss of the diazoalkane nitrogen to the pyrazoles 7, 10 may occur. In the case of electron donating aroylarylketenes the 1,3,4-oxadiazolines 8 are obtained. For the latter reaction, an intermediate azo-zwitterion 5 is assumed.
    Notes: Diazodiketone 1 reagieren mit Diazoalkanen 3 unter den Bedingungen der Wolff-Umlagerung über die hypothetischen Diazoniumbetaine 4 in der Regel durch 1,4-Cyclisierung. wobei 3-Furanone 11 und die Enolderivate 12gebildet werden. Mit dieser Reaktion konkurrieren in Abhängigkeit von stabilisierenden Substituenten: die 1,2-Cyclisierung zum Cyclopropanon 6 bzw. dem Acrylester 9; unter Beibehaltung des Diazoalkan-Stickstoffs Cyclisierung zu den Pyrazolen 7, 10; bei Verwendung elektronenreicher Aroylarylketene schließlich Bildung der 1,3,4-Oxadiazoline 8: Für diesen Reaktionsverlauf wird ein intermediäres Azo-Zwitterion 5 angenommen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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