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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 96 (1963), S. 1712-1719 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Verschiedene Umsetzungen am reinen syn-Methyldiazotat-kalium in festem Zustand lassen eine Nitrosaminstruktur vermuten. Kernresonanzmessungen beweisen lediglich das Vorhandensein einer CH3-Gruppe. Die Röntgenstrukturanalyse ergibt das Vorliegen eines mesomeren organischen Anions mit cis-Konfiguration, dessen N—N—O-Bindungen annähernd gleichen, ca. 50-proz. Doppelbindungscharakter haben und das dem Kaliumkation als Ganzes gegenübersteht.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 86 (1974), S. 163-163 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 83 (1971), S. 883-884 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Configuration of 2-Amino-4-hydroxy-4-(5-hydroxy-2-pyridyl)-3-methylbutyric Acid, the N-Terminal Amino Acid of the NikkomycinsThe N-ethylthio(thiocarbonyl)derivative 2 of the N-terminal amino acid 1 of the nikkomycin antibiotics shows a positive Cotton effect in its circular dichroism spectrum and therefore 1 is assigned to the L-series. The relative configuration of the C atoms 3 and 4 was ascertained by 1H-NMR investigations and crystal structure analysis. Accordingly, 1 is assigned the configuration 2S,3S,4S.
    Notes: Das N-Ethylthio(thiocarbonyl)derivat 2 der N-terminalen Aminosäure 1 der Nikkomycin-Antibiotika weist Circulardichroismus mit positivem Cottoneffekt auf und 1 ist daher der L-Reihe zu-zuordnen. Die relative Konfiguration an den C-Atomen 3 und 4 wurde durch 1H-NMR- und Kristallstrukturuntersuchungen bestimmt. Danach hat 1 die Konfiguration 2S,3S,4S.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolites of Microorganisms, 199.  -  Structure Elucidation of the Nikkomycins I, J, M, and NNikkomycins are nucleoside antibiotics exhibiting fungicide and insecticide activity which is due to an inhibition of chitin biosynthesis. From the culture filtrate of Streptomyces tendae the previously described nikkomycins Z2) (1 a) and X3) (1 b) have been isolated as major components. As minor components the nikkomycin B4) (1 c) as well as the nikkomycins I (1 d), J (1 e), M (1 f), and N (1 g), described in this paper, have been isolated.
    Notes: Die Nikkomycine sind Nucleosidantibiotika mit fungizider und insektizider Wirkung, die auf einer Hemmung der Chitinbiosynthese beruhen. Das Kulturfiltrat von Streptomyces tendae liefert als Hauptkomponenten die bereits beschriebenen Nikkomycine Z2 (1 a) und X3) (1 b). Als Nebenkomponenten lassen sich aus dem Kulturfiltrat die Nikkomycine B4) (1 c) sowie die im folgenden beschriebenen Nikkomycine I (1 d), J (1 e), M (1 f) und N (1 g) isolieren.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Three Novel Amino Acids from the Nikkomycin Complex - Structure Elucidation and SynthesisFrom the culture medium of Streptomyces tendae Tue 901 some new metabolites were characterized: 2-amino-4-hydroxy-3-methyl-4-(2-pyridyl)butanoic acid (1) [nikkomycin E], its isomer 2-amino-4-hydroxy-3-methyl-4-(3-pyridyl)butanoic acid (2) [as N-terminal constituent of the nikkomycins Px (5) and Rz (6)], and 2-amino-4-hydroxy-4-(2-pyridyl)butanoic acid (3) [as N-terminal amino acid of the nikkomycins Kx (7) and Kz (8)]. The structure elucidation was achieved by NMR, mass spectrometry and by comparison with synthetic reference compounds.
    Notes: Aus dem Kulturfiltrat von Streptomyces tendae Tue 901 wurden weitere neue Metabolite charakterisiert: 2-Amino-4-hydroxy-3-methyl-4-(2-pyridyl)buttersäure (1) [Nikkomycin E], die dazu isomere 2-Amino-4-hydroxy-3-methyl-4-(3-pyridyl)buttersäure (2) [als N-terminaler Baustein der Nikkomycine Px (5) und Rz (6)] und 2-Amino-4-hydroxy-4-(2-pyridyl)buttersäure (3) [als N-terminale Aminosäure der Nikkomycine Kx (7) und Kz (8)]. Die Strukturaufklärung erfolgte durch Kernresonanz, Massenspektrometrie und durch Vergleich mit entsprechenden Syntheseprodukten.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolites of Microorganisms, 182.  -  Structure Elucidation of the Nucleoside Antibiotic Nikkomycin XIn addition to the previously described nikkomycin Z, the structure of which could be confirmed, a new chitin synthase inhibiting component, nikkomycin X, could be isolated from the culture filtrate of Streptomyces tendae. Nikkomycin X is a structural isomer of nikkomycin Z and contains a 4-formyl-4-imidazolin-2-one unit instead of uracil. The structure was established by spectroscopic methods, chemical degradation and partial synthesis. Biological activity and antibiotic spectra of the two nikkomycins are similar.
    Notes: Neben dem bereits früher beschriebenen Nikkomycin Z, dessen Struktur bestätigt werden konnte, wurde aus dem Kulturfiltrat von Streptomyces tendae eine weitere die Chitinsynthase hemmende Komponente, Nikkomycin X, isoliert, die mit Nikkomycin Z strukturisomer ist, aber anstelle von Uracil 4-Formyl-4-imidazolin-2-on enthält. Die Struktur wurde mit spektroskopischen Methoden, durch chemischen Abbau und durch Teilsynthesen bewiesen. Die biologischen Aktivitäten und die Wirkungsspektren der beiden Nikkomycine sind ähnlich.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Configuration and Conformation of the Nucleoside Residues of the NikkomycinsThe configuration of 5′-amino-5′-deoxy-β-D-allofuranuronosyl derivatives of uracil and 4-formyl-4-imidazolin-2-one could be assigned to the C-terminal nucleoside residues 1 and 2, respectively, of the nikkomycins, according to 1H NMR spectroscopy, circular dichroism, and X-ray analysis. The latter method also showed that 1 and 2 have C-2′-endo-C-1′-exo conformation (21T) with gauche (g+) position of hte CO⊖2-group, trans (t) position of the NH⊕3-group, and anti position of the base. The conformation in solution was determined by 1H NMR spectra and from the 13C-1-H-vicinal couplings and shows only minor deviations from the conformation of the crystal.
    Notes: Den in den Nikkomycinen C-terminal gebundenen Nucleosiden 1 und 2 konnte durch 1H-NMR-Spektroskopie, Circulardichroismus und Kristallstrukturanalyse die Konfiguration von 5′-Amino-5′-desoxy-β-D-allofuranuronosyl-Derivaten des Uracils bzw. 4-Formyl 4 imidazolin-2-ons zugeordnet werden. Die Kristallstrukturanalyse zeigte darüber hinaus, daß 1 und 2 in der C-2′-endo-C-1′-exo-Konformation (21T) vorliegen, wobei die CO⊖2-Gruppe die gauche-Lage (g+), die NH⊕3-Gruppe die trans-Lage (t) und die Base anti-Stellung einnehmen. Die Konformation in Lösung wurde aus 1H-NMR-Spektren und durch Bestimmung der 13C-1H-Vicinalkopplungen ermittelt und weicht nur geringfügig von der Konformation im Kristall ab.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1976 (1976), S. 2011-2020 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of the Peptide Antibiotic StenothricinThe structure of the peptide antibiotic Stenothricin was investigated by combined application of chromatography, degradation, derivatization, and mass spectrometry. Most probably Stenothricin is β-ketoacyl-D-Cys(O3H)-L-Val-D-Ser-L-Lys-Sar-D-αThr-L-Ser-L-diaminopropionic acid. The β-ketoacyl residues consist of several isomers having chain lengths of 14 to 17 carbon atoms.
    Notes: Die Struktur des Peptidantibiotikums Stenothricin wurde durch Chromatographie, Abbau und Derivatbildungsmethoden sowie Massenspektrometrie untersucht. Danach ist Stenothricin mit großer Wahrscheinlichkeit β-Ketoacyl-D-Cys(03H)-L-Val-D-ser-L-Lys-sar-D-αThr-L-Ser-L-Diaminopropionsäure, wobei die β-Ketoacyl-Reste aus mehreren Isomeren mit Kettenlängen zwischen 14 und 17 C-Atomen bestehen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 10 (1971), S. 811-812 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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