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  • 1
    ISSN: 0170-2041
    Keywords: Terphenyl derivatives ; Leucomentins ; 2-Hexenoic acid, 4,5-epoxy- ; Paxillus atrotomentosus ; Atromentin, precursor of ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fungal Pigments, 60. - Leucomentins, Colourless Precursors of Atromentin from the Mushroom Paxillus atrotomentosusAtromentin (1) occurs in sporophores of Paxillus atrotomentosus mainly in form of the colourless leucomentins 3-5. These compounds constitute esters of leucoatromentin with (2Z,4S,5S)-4,5-epoxy-2-hexenoic acid. The absolute configuration of the latter has been determined by its conversion into (+)-O-acetylosmundalactone (6a). The mechanism of the acid-catalyzed cleavage of the acyl residues has been studied by means of 18O labeling.
    Notes: Atromentin (1) liegt in Fruchtkörpern des Samtfußkremplings hauptsächlich in Form der farblosen Leucomentine 3-5 vor. Die Leucomentine sind Ester des Leukoatromentins mit (2Z,4S,5S)-4,5-Epoxy-2-hexensäure, deren absolute Konfiguration durch Überführung in (+)-O-Acetylosmundalacton (6a) bestimmt werden konnte. Dabei wurde der Mechanismus der säurekatalysierten Abspaltung der Säurereste durch 18O-Markierung aufgeklärt.
    Additional Material: 1 Tab.
    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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