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  • Organic Chemistry  (5)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 919-926 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and 13C-N.M.R.-Spectroscopy of Pyrrolo-[2,1,-b]quinazolineIn 6- or 7-position substituted pyrrolo-[2,1-b]quinazoline derivatives were synthesized by reacting substituted anthranilic acid derivatives with either 4-amino-butyric acid or 2-methoxy-Δ1-pyrroline. Furthermore some at C-3 substituted desoxyvasicinone derivatives were prepared. Using these compounds and different n.m.r. spectroscopie techniques the 13C resonance signals of all carbon atoms in peganine were assigned.
    Notes: Durch Umsetzung von substituierten Anthranilsäuren mit 4-Aminobuttersäure bzw. 2-Methoxy-Δ1-pyrrolin wurden in 6- und 7-Stellung substituierte Pyrrolo[2,1-b]chinazoline synthetisiert. Des weiteren wurde eine Anzahl von in 3-Stellung substituierten Desoxyvasicinonderivaten hergestellt. Unter Verwendung dieser Verbindungen und verschiedener spektroskopischer Techniken gelang die Zuordnung der 13C-NMR-Signale im Peganin.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 463-470 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal and Molecular Structure of Peganine. Estimation of its Absolute ConfigurationThe crystal and molecular structure of (-)-peganine hydrochloride 2 have been determined by X-ray structure analysis. Furthermore the absolute configuration of this alkaloid was deduced with the aid of the anomalous scattering at the Cl-atoms. The pyrrolidine ring of 2 has envelope conformation. 2 possesses R-configuration.
    Notes: Mittels Röntgenkristallstrukturanalyse wurde die Molekül- und Kristall-struktur sowie unter Ausnutzung der anomalen Streuung an den Chloratomen des Hydrochlorids von 2 die Absolutkonfiguration von (-)-Peganin 2 bestimmt. Danach besitzt 2 R-Konfiguration.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 52 (1969), S. 776-789 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From the feeding of young plants of Strychnos nux-vomica with [14C]-1-and [14C]-2-acetate it could be deduced that the C-atoms 22 and 23 were derived from acetate. [14C]-2-mevalonate, [14C]-2-geraniol and [14C]-2-geranyl pyrophosphate were also incorporated into strychnine. The distribution of radioactivity in the «mevalonate-strychnine» was in agreement with the monoterpenoid hypothesis. Feeding experiments especially with [14C]-tryptophane showed that the main production centre of the alkaloid lay in the roots and that only a small part of it was carried to the leaves. Tritium labelled WIELAND GUMLICH aldehyde as well as N(a)-[14C]-1-acetyl WIELAND GUMLICH aldehyde were not converted into strychnine by S. nux-vomica.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 826-834 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In addition to the known alkaloid peganine (1) from young plants of the Acanthacea Adhatoda vasica, the base anisotine (7) and the three new alkaloids vasicoline (4), adhatodine (5), and vasicolinone (6) were isolated and analysed. Mainly on the basis of spectral properties (UV., IR., NMR. and mass spectrometry) the structures were assigned. By atmospheric oxygen the bases vasicoline and adhatodine are oxidized in position 7; it is therefore remarkable that these bases are present as such in the plant.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 49 (1966), S. 1714-1715 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The results of 1-[14C]-sodium acetate feeding experiments with Strychnos nux vomica L. have shown that the C-atoms 22 and 23 of strychnine are very probably acetate derived.
    Type of Medium: Electronic Resource
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