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  • Wiley-Blackwell  (2)
  • 1995-1999  (2)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 79 (1996), S. 658-662 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An Alternative Approach to the PQQ-TriesterA novel approach to triethyl 5-methoxy-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylate (6), a close precursor of the redox cofactor PQQ of bacterial dehydrogenases, is described. Diethyl 2-oxopent-3-ynedioate (5) was used as building block for the annelation of the quinoline unit. The annelation proceeds in two steps via the diastereoselective formation of diethyl (Z)-4-{[2-(ethoxycarbonyl)-5-methoxyindol-6-yl]amiono}-2-oxopent-3-enedioate ((Z)-7) followed by acid-catalyzed cyclocondensation.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0173-0835
    Keywords: Capillary electrophoresis ; Cyclodextrins ; Resolution ; Substituents ; Degradation products ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Capillary electrophoresis was used to separate diastereomers and enantiomers of synthesized thiopyrans and thiinopyrroles. Separation conditions were optimized by varying the buffer parameters, i.e., kind and concentration of chiral selector, pH, main buffering component, micelle forming additives, and content of organic solvents. The interaction of thiopyrans and thiinopyrroles with β- and γ-cyclodextrins results in the separation of enantiomers and diastereomers. The magnitude of the resolution depends on the spatial requirements of the different substituents of the analytes and the dimensions of the cyclodextrin cavity. For well-separated enantiomers or diastereomers the identification and characterization of degradation products was possible.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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