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  • 2000-2004
  • 1985-1989  (2)
  • 1965-1969
  • 1,3-Dicarbonyl compounds  (1)
  • Paxillus panuoides  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 247-254 
    ISSN: 0170-2041
    Keywords: Carbohydrates ; Chain elongation ; 1,3-Dicarbonyl compounds ; C-Nucleosides ; Pyrazoles ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chain Elongation of Carbohydrates: Synthesis of C-Glycosides and C-Nucleosides from Glyconic and Glycaric AcidsBy chain elongation using the C-phenylglycine method allyl residues can be attached to peracetylated glyconic and glycaric acids. Oxidative cleavage of the allylic double bond leads to 1,3-dicarbonyl compounds, which can be converted into optically pure C-glycosides and C-nucleosides by reaction with 1,2-dinucleophiles.
    Notes: Durch Kettenverlängerung mit Hilfe von C-Phenylglycin lassen sich peracetylierte Glyconsäuren und Glycarsäuren mit Allylresten C - C-verknüpfen. Oxidative Spaltung der Allyl-Doppelbindung ergibt 1,3-Dicarbonylverbindungen, aus denen sich durch Ringschlußreaktionen mit 1,2-Dinucleophilen stereochemisch einheitliche C-Glycoside und C-Nucleoside darstellen lassen.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Fungal pigments ; Terphenylquinones ; Flavomentins ; Spiromentins ; Paxillus atrotomentosus ; Paxillus panuoides ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fungal Pigments, 61. - Flavomentins and Spiromentins, Novel Terphenylquinone Derivatives from Paxillus atrotomentosus and P. panuoides (Boletales)The gilled toadstools Paxillus atrotomentosus and P. panuoides produce small amounts of orange-yellow flavomentins and violet spiromentins. The flavomentins 1-3 constitute mono- and diesters of atromentin (6) with (2Z,4E)-2,4-hexadienoic acid or (2Z,4S,5S)-4,5-epoxy-2-hexenoic acid. In addition, 3-O-acetylatromentin (4) has been isolated from P. atrotomentosu. The spiromentins 8,11,12, and 13 possess a unique spiro structure in which a 4,5-dihydroxy-1,2-benzoquinone is linked to a lactone acetal unit. The structures of the pigments were confirmed by the synthesis of model compounds and the biomimetic conversion of flavomentin B (2) into the spiromentins B (11) and C (12).
    Notes: Die Kremplinge Paxillus atrotomentosus und P. panuoides produzieren in geringen Mengen orangegelbe Flavomentine und violette Spiromentine. Bei den Flavomentinen 1-3 handelt es sich um Ester des Atromentins (6) mit (2Z,4E)-2,4-Hexadiensäure oder (2Z,4S,5S)-4,5-Epoxy-2-hexensäure, außerdem kommt als weitere Verbindung dieses Typs 3-O-Acetylatromentin (4) vor. Die Spiromentine 8, 11, 12 und 13 besitzen eine ungewöhnliche Spirostruktur, in der ein 4,5-Dihydroxy-1,2-benzochinon mit einem Lacton acetalartig verknüpft ist. Die spektroskopisch abgeleiteten Strukturen der Farbstoffe konnten durch die Synthese von Modellverbindungen und die biomimetische Überführung von Flavomentin B (2) in die Spiromentine B (11) und C (12) gesichert werden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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