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  • 1
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Gloeosporone, the germination self-inhibitor from the fungus Colletotrichum gloeosporioides f.sp. jussiaea, is shown by spectroscopic data and X-ray analysis to have the constitution and relative configuration as shown in Formula 2 (either (1S,6R,12R)-1-hydroxy-6-pentyl-5,15-dioxabicyclo[10.2.1]pentadecan-4,13-dione or its enantiomer), rather than the previously assigned constitution 1.
    Additional Material: 3 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 934-943 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Annular compounds containing two PAuP-entities are prepared by reaction of (trialkylphosphine)gold (I) halogenides with diphosphines. With bis (dimethyl-phosphino)methane (DMPM), 1,2-bis(dimethylphosphino)ethane (DMPE) and 1,3-bis(dimethylphosphino)propane (DMPP) we obtained the following 8-, 10-and 12-membered annular binuclear complexes: [Au(DMPM)]2Cl2 H2O, [Au(DMPM)]2(SbF6)2, [Au(DMPE)]2Cl2 2H2O, [Au(DMPE)]2(SbF6)2, [Au-(DMPP)]2Cl2 and [Au(DMPP)]2(SbF6)2 as identified by conductivity measurements, 1H- and 31P-NMR. spectra and extinction curves. Their absorption spectra differ from those of the isolated linear PAuP-complexes mainly by a very strong band at low energy which is absent in the latter. There is a strong interaction between the PAuP-entities only in certain excited electronic states and an understanding of all transitions is only possible, if both chromophores PAuP and (PAuP)2 are taken as a basis of interpretation. Bands of the same spectrum belong apparently to two different electronic systems.The absorption spectra of isolated linear and annular ylide-complexes containing one and two CAuC-entities, respectively, show quite the same behaviour.
    Additional Material: 5 Ill.
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  • 3
    ISSN: 0170-2041
    Keywords: Gloeosporone ; Colletotrichum gloeosporioides ; 4-Pentynoic acid ; Oxidation, alkyne → 1,2-diketone ; 23Na NMR ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gloeosporon - Ein Pilzkeimungs-Selbsthemmer mit Macrolidstruktur. - Totalsynthese und AktivitätAusgehend von (S)- oder (R)-4-Brom-1,2-epoxybutan [kommerziell erhältlich oder leicht und in hoher Ausbeute aus (S)- bzw. (R)- Apfelsäure zugänglich] wurden die beiden Enantiomeren des Keimungs-Selbstinhibitors Gloeosporon hergestellt. Die absolute Konfiguration des Naturstoffes wurde damit als 4S,7R,13R bewiesen. Mikrobiologische Tests zeigen, daß beide Enantiomere von Gloeosporon die Keimungshemmung der Sporen von Colletotrichum gloeosporioides bewirken, und daß (-)-Gloeosporon gegenüber einer Reihe von anderen Pilzen aktiv ist. Zur Aufklärung des Wirkungsmechanismus wurden 23Na-NMR- sowie Ionenselektivitätsmessungen durchgeführt; es konnten keine Gloeosporon-Metallion-Wechselwirkungen nachgewiesen werden.
    Notes: Starting with (S)- or (R)-4-Bromo-1,2-epoxybutane [commercially available or readily made from (S)- or (R)-malic acid], both enantiomers of the germination self-inhibitor gloeosporone were synthesized. The absolute configuration of the natural product was thus proven to be 4S,7R,13R. Microbiological studies showed that both enantiomers of the compound cause inhibition of germination in spores of Colletotrichum gloeosporioides, and that (-)-gloeosporone is also active against a variety of other fungi. In order to gain some insight into the mode of action, 23Na NMR measurements and ion-selectivity studies were undertaken; none of these experiments provided evidence for a gloeosporone-metal ion interaction.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 58 (1925), S. 1096-1103 
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 10 (1989), S. 303-316 
    ISSN: 0739-4462
    Keywords: juvenile hormone metabolites ; L-[14C]methionine incorporation ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Corpora cardiaca-corpora allata (CC-CA) from vitellogenic females of Nauphoeta cinerea degraded, in vitro, racemic and (10R)-juvenile hormone III (JH III) at a rate of 249 pmol/CC-CA/h and 786 pmol/CC-CA/h, respectively. The major metabolite formed was JH III acid, together with some highly polar products. CC-CA homogenates degraded racemic JH III to a small extent, whereas (10R)-JH III was degraded efficiently to JH III acid. No highly polar products were formed by CC-CA homogenates. When CC-CA were incubated with racemic JH III acid, some of this substance was degraded to highly polar products, and a minor part was methylated to JH III. CC degraded very little JH III acid and did not methylate it to JH III. CC-CA homogenates methylated JH III acid very efficiently; we measured an apparent Kmax of 37.8 μM and a Vmax of 1,260 pmol/4 h/ CC-CA equivalent. The addition of JH III acid to CC-CA in vitro increased the rate of biosynthesis of JH III, as determined by measuring incorporation of methyl[14C]methionine into JH III. These data indicate that the metabolite JH III acid can enter the CA and be methylated to JH III.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 10 (1989), S. 317-331 
    ISSN: 0739-4462
    Keywords: Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: In vitellogenic females of Nauphoeta cinerea, injected (10R)-juvenile hormone (JH) III was degraded more rapidly than racemic JH III: we measured a half-life of 21 min (with or without coinjection of lipophorin) for the former and 24 min (with coinjection of lipophorin) and 43 min (without coinjection of lipophorin) for the latter. One to two hours after injection, JH III acid was the major metabolite observed; in addition, several highly polar products were found. The half-life of injected racemic JH III acid was 19 min with coinjection of lipophorin and 4 min without. The JH III acid titer in hemolymph was low (around 5-10 pmol/ml) in last instar larvae and previtellogenic and pregnant females and reached higher values (40-100 pmol/ml) in vitellogenic and ovulating females. Racemic JH III acid could be methylated in vitro to JH III by corpora cardiaca-corpora allata (CC-CA) from penultimate instar larvae and females at stages between adult ecdysis and ovulation and at the very end of pregnancy, but not by CC-CA from last instar larvae and adult females at earlier stages of pregnancy. This indicates that CC-CA are capable of methylating JH III acid only at stages when JH III is detectable in the hemolymph. In double-labelling experiments with CC-CA from vitellogenic females and L-[14C]methionine and [3H]JH III acid as precursors, we observed that only a small proportion (1-8%) of total biosynthesized JH III was derived from JH III acid when the latter was present at physiological concentration. This suggests that in vivo recycling of JH III acid by CC-CA plays only a minor role in the regulation of the titer of JH III and JH III acid.
    Additional Material: 3 Ill.
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