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  • 1980-1984  (3)
  • 1981  (3)
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  • 1980-1984  (3)
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  • 1
    Publication Date: 1981-01-01
    Print ISSN: 0040-4020
    Electronic ISSN: 1464-5416
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3599-3608 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Aziridines (Aziranes), XXVI: Amine Catalyzed Amidoethylation of β-Dicarbonyl Compounds Simple Synthesis of 2-Methylpyrrole-1,3-dicarboxylateEsters of nonsubstituted and monosubstituted malonic, cyanoacetic, and β-keto acids are easily C-amidoethylated by N-acylaziridines in the presence of triethylamine. In this amine catalyzed reaction the acylaziridines show different degrees of reactivity. Often the products cannot be obtained by the known amidoethylation procedure or but in smaller yields. The new product 3g may smoothly be converted to the pyrroline 9 and further to the 2-methylpyrrole-1,3-dicarboxylate 10. - Divergent from earlier results, the primary amidoethylation product can be isolated from the known sodium salt reaction of tert-butyl acetoacetate with nonbulky acylaziridines. This product is cleaved by trifluoroacetic acid with remarkable easiness to yield the corresponding amidoethyl derivative of acetone.
    Notes: Unsubstituierte und monosubstituierte Malonester, Cyanessigester und β-Ketoester werden in Gegenwart von Triethylamin durch N-Acylaziridine leicht am C amidoethyliert, dabei zeigt sich eine Reaktivitätsabstufung der N-Acylaziridine. Die Produkte sind oft durch die bisher bekannte Amidoethylierung nicht oder nicht in so guten Ausbeuten zugänglich. Das neue Produkt 3g läßt sich glatt zum Pyrrolin 9 und weiter zum 2-Methylpyrrol-1,3-dicarbonester 10 umwandeln. - Abweichend von bisherigen Ergebnissen kann man aus Acetessigsäure-tert-butylester nach der bekannten Natriumsalzmethode auch mit nichtsperrigen Acylaziridinen das Primärprodukt fassen, das mit Trifluoressigsäure bemerkenswert leicht zum entsprechenden Amidoethylderivat des Acetons gespalten wird.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 32-48 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Aziridines, XXII1) One step Synthesis of Pyrrolidones by Amidoethylation of Simple Esters with N-AcylaziridinesSodium enolates of simple esters (2) react smoothly with N-acylaziridines 3 in THF forming 3-substituted 2-pyrrolidones 8. If the λ-position of the ester carries more than one H-atom amidoethylated pyrrolidones can result. Whilst a simple butyrolactone behaves analogously amidoethylation of coumaranone furnished mono and bis amidoethyl derivatives of coumaranone besides a pyrrolidone. In tert-butyl alcohol only extremly acidic esters like 1e and 1j could be amidoethylated.
    Notes: Natriumenolate einfacher Ester (2) lassen sich mit N-Acylaziridinen 3 in THF glatt zu 3-substituierten 2-Pyrrolidonen 8 umsetzen. Trägt der Ester in der α-Stellung mehr als ein H-Atom, könen auch amidoethylierte Pyrrolidone entstehen. Während sich ein einfaches Butyrolacton analog verhielt, ergab die Amidoethylierung von Cumaranon neben einem Pyrrolidon Mono- und Bisamidoethylderivat des Cumaranons. - In tert-Butylalkohol ließen sich nur extrem acide Ester wie 1e und 1j amidoethylieren.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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