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  • 4-Alkyl-4-arylpiperidines  (1)
  • Cephalosporin  (1)
  • Organic Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 1 (1989), S. 202-208 
    ISSN: 0899-0042
    Keywords: opioid ligand ; 4-arylpiperidines ; conformation, NMR ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and stereochemistry (configuration and preferred solute conformation) of some 4-alkyl (methyl, n-propyl, isobutyl)-4-(3-hydrxyphenyl)-1-methylpiperidines and corresponding 3-methyl diastereoisomeric pairs are reported, together with their in vivo and in vitro activities as opioid ligands. All potent agonists exhibit a preference for axial 4-aryl chair conformations when protonated, and stereochemical analogies with rigid opioids of the benzomorphan class are discussed. Antagonist properties are found in compounds with preference for equatorial 4-aryl chairs, notably the cis 3,4-dimethyl derivative.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 964-972 
    ISSN: 0749-1581
    Keywords: 4-Alkyl-4-arylpiperidines ; Opioid ligands ; 1H NMR ; 13C NMR ; Stereochemistry ; Conformational analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H (270, 400 MHz) and 13C (67.5 MHz) NMR spectra of some 4-methyl- (also 4-n-propyl- and -isobutyl)-4-(3-hydroxy- and 3-methoxy-phenyl)piperidines and their 3-methyl diastereoisomers are reported. Many of the compounds had opioid ligand activities. The data were analysed in terms of preferred conformation and configuration (3-methyl derivatives). Only compounds with preference for axial 4-aryl chair conformations displayed marked agonist properties and the one potent antagonist, cis-1,3,4-trimethyl-4-(3-hydroxyphenyl)piperidine, favoured an equatorial 4-aryl chair.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 465-479 
    ISSN: 0749-1581
    Keywords: β-Lactam antibiotics ; Penicillin ; Cephalosporin ; 13C NMR ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C NMR features of most β-lactam antibiotics of the penicillin and cephalosporin groups in clinical use are presented and reviewed. Data on precursor and breakdown products are included in the survey, with particular reference to benzylpenicillin. Penicillin and cephalosporin spectra are discussed, and points of similarity and difference emphasized. The potential of the data for solving problems of analysis, stability, degradation and biological structure-activity relationships is summarized.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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