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  • 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
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  • 2
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The stereochemistry of diastereoisomeric propionyl esters of 4-(2-furyl)-3-methyl-1-phenethylpiperidin-4-ols has been established by 13C NMR analysis. Both isomers, after acid-catalysed ethanolysis, are converted to the corresponding 4-ethoxy derivative of configuration (t-3-Me, r-4-OEt) that correlates with its analgesic properties.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    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
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