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  • Chemistry  (3)
  • 1975-1979  (3)
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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolic Products of Microorganism, 172. Isolation of the Antibiotic semi-Vioxanthin from Penicillium citreo-viride and Synthesis of XanthomegninBesides xanthomegnin (16 b), 3,4-dehydroxanthomegnin (29a), viomellein (23) and vioxanthin (3) from Penicillium citreo-viride under different culture conditions semi-vioxanthin (7) was isolated. Structure 7 has been established by its spectra and the fact that oxidation with Fremy's salt gives 3,4,6,9-tetrahydro-10-hydroxy-7-methoxy-3-methyl-1,6,9-trioxo-1H-naphtho[2,3-c]pyran (9a = semi-xanthomegnin). -9c, prepared by demethylation of 9a, was dimerized by potassium peroxydisulfate/sodium hydroxide and methylated, giving 16b. Synthetic 16b and authentic xanthomegnin were identical, which verifies the structure revised by Höfle and Röser9) and shows, that the dyes of the xanthomegnin series are biogenetically homogenous. - The metabolic products of the strain inhibit the growth of bacteria. 16b and 26 furthermore have an effect against insects.
    Notes: Neben Xanthomegnin (16b), 3,4-Dehydroxanthomegnin (29 a), Viomellein (23) und Vioxanthin (3) wurde aus Penicillium citreo-viride unter veränderten Kulturbedingungen semi-Vioxanthin (7) isoliert. Konstitution 7 folgt aus den Spektren und dem Befund, daß mit Fremy-Salz 3,4,6,9-Tetrahydro-10-hydroxy-7-methoxy-3-methyl-1,6,9-trioxo-1H-naphtho[2.3-c]pyran (9a = semi-Xanthomegnin) entsteht. - Das durch Entmethylierung von 9a zugängliche 9c ließ sich mit Kaliumpersulfat/Natriumhydroxid zu 16a dimerisieren, das zu 16b methyliert wurde. Synthetisches 16b war mit nativem Xanthomegnin identisch, was die von Höfle und Röser9) revidierte Konstitution bestätigt und beweist, daß die Farbstoffe der Xanthomegnin-Reihe biogenetisch einheitlich sind. - Die Stoffwechselprodukte des Stammes hemmen das Wachstum von Bakterien, 16b und 23 wirken ferner gegen Insekten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 2079-2088 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Lipomycins, III. - Isolation and Identification of the Methyl 2,6-Dideoxy-D-ribo-hexosidesThe methyl glycosides isolated from α-lipomycin (2) are identified as anomeric methyl 2,6- dideoxy-D-ribo-hexopyranosides (3a, 4a) and -hexofuranosides (5a, 6a). At equilibrium the mixture of the methyl hexosides contains pyranosides and furanosides in the ratio 3: 1. The furanosides have the same anomeric ratio, whereas the β-form 3a of the pyranosides predominates over the αform 4a. - The mass spectra of the trimethylsilyl ethers and the 1H-NMR spectra of the four compounds are discussed. The pyranosides prefer the 4C1 conformation.
    Notes: Die aus α-Lipomycin (2) isolierten Methylglykoside werden als anomere Methyl-2,6-didesoxy- D-ribo-hexopyranoside (3 a, 4a) und -hexofuranoside (5a, 6a) identifiziert. Im Gleichgewicht enthält das Methylhexosidgemisch Pyranoside und Furanoside im Verhältnis 3 : 1. Die anomeren Furanoside entstehen in gleicher Menge, bei den Pyranosiden überwiegt die β-Form 3a. - Die Massenspektren der Trimethylsilyläther und die 1H-NMR-Spektren der vier Komponenten werden vergleichend diskutiert. Die Pyranoside bevorzugen die 4C1- Konformation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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