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  • 1980-1984  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1469-1475 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N-Acyl Dehydro-α-amino Acids from N-Formyl Dehydro-α-amino Acid EstersOn treatment with methyl potassioisocyanoacetate (2), aldehydes and ketones 1 give N-anionized N-formyl dehydro-α-amino acid methyl esters 3. Compound 3 with R1 = CH3, R2 = H is obtained by base induced ring opening of methyl 2-oxazoline-4-carboxylate 5.  -  Acylation of 3, followed by deformylation of the intermediates 6, yields N-acyl dehydro-α-amino acid methyl esters 7 which can be hydrolyzed to the N-acyl dehydro-α-amino acids 8.
    Notes: Aus Aldehyden und Ketonen 1 erhält man mit Kalioisocyanessigsäure-methylester (2) durch Formylaminomethylenierung die am Stickstoff anionisierten N-Formyldehydro-α-aminosäure-methylester 3. Für 3 mit R1 = CH3 und R2 = H ist die baseninduzierte Ringöffnung des 2-Oxazolin-4-carbonsäure-methylesters 5 günstiger.  -  Durch N-Acylierung von 3, gefolgt von Entformylierung der Zwischenstufen 6, erhält man die N-Acyldehydro-α-aminosäureester 7, die zu den N-Acyldehydro-α-aminosäuren 8 hydrolysierbar sind.
    Type of Medium: Electronic Resource
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