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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 2503-2509 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese of Heterocyclic Compounds, CXC; Reactions of Cyclic Oxalyl Compounds, XV: A Simple Synthesis of 2,3,4,5-Tetrahydro-1H-1,3-diazepine-2,4,5-trionesThe H⊕-catalyzed reaction of 4-benzoyl-5-phenyl-2,3-dihydro-2,3-furandione (1) with an excess of arylisocyanates or di-p-tolylcarbodiimide (molar ratio 1:4) gives the 2,3,4,5-tetrahydro-1H-1,3-diazepine-2,4,5-triones 3. The constitutions of 3 are confirmed by alkaline hydrolysis and condensation with aniline. Heating of 3 in dry decalin yields the 4-[α-(arylimino)benzyl]-4-pyrroline-2,3-diones 7, decomposition of 3a at 220-230°C leads to the formation of 2,4-diphenyl-3-quinolineglyoxylanilide (5) and the 4-pyrrolin-2-one derivative 6.
    Notes: 4-Benzoyl-5-phenyl-2,3-dihydro-2,3-furandion(1) setzt sich mit Arylisocyanaten bzw. Di-p-tolyl-carbodiimid (Molverh. 1:4) unter H⊕-Katalyse zu den 2,3,4,5-Tetrahydro-1H-1,3-diazepin-2,4,5-trionen 3 um, deren Konstitution auch durch alkalische Hydrolyse bzw. Reaktion mit Anilin gesichert wird. Die Thermolyse von 3 in wasserfreiem Decalin liefert nach Arylisocyanat-Verlust die 4-[α-(Arylimino)benzyl]-4-pyrrolin-2,3-dione 7, bei trockenem Erhitzen Von 3a auf 220 bis 230°C bildet sich das 2,4-Diphenyl-3-chinolinglyoxylanilid (5) neben dem 4-Pyrrolin-2-on-Derivat 6.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mechanistic Investigations by Isotopic Labeling, II.  -  Mechanism of the Rearrangement of 1-Diphenylamino-2,3-dihydro-2,3-pyrrolediones into Pyrrolo[2,3-b]indolesIt has been shown, by means of 14C-labeling, that the rearrangement of 1-diphenylamino-2,3-dihydro-2,3-pyrrolediones 1 yielding the pyrrolo[2,3-b]indoles 2 is a strictly intramolecular process. The results of kinetic investigations and activation parameters agree with a concerted mechanism. A connection with the Fischer indole synthesis is discussed.
    Notes: Mit Hilfe von 14C-Markierung wird gezeigt, daß die Umlagerung der 1-Diphenylamino-2,3-dihydro-2,3-pyrroldione 1 in die Pyrrolo[2,3-b]indole 2 streng intramolekular abläuft. Die kinetischen Meßergebnisse und Aktivierungsparameter weisen auf einen “concerted” Mechanismus hin. Ein Zusammenhang mit der Fischerschen Indolsynthese wird diskutiert.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 1979-1983 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Cyclic Oxalyl Compounds, XIII. - Indole Rearrangement of 1-Diphenylamino-2,3-dihydro-2,3-pyrroledionesThe 1 -diphenylamino-2,3-dihydro-2,3-pyrrolediones 2, synthesized by treating the hydrazones 1 with oxalyl dichloride, can rearrange on heating to give the pyrrolo[2,3-b]indoles 3 and 6 and the (3-indolyl)glyoxylamides 4. The rearrangement is shown to be connected with the Fischer indole synthesis.
    Notes: Die aus den Hydrazonen 1 mit Oxalyldichlorid synthetisierten l-Diphenylamino-2,3-di- hydro-2,3-pyrroldione 2 lagern sich thermisch in die Pyrrolo[2,3-b]indole 3 und 6 sowie in die (3-Indolyl)glyoxylsäureamide 4 um. Der Zusammenhang mit der Fischer-Indolsynthese wird aufgezeigt.
    Type of Medium: Electronic Resource
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