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  • 1
    Electronic Resource
    Electronic Resource
    Stereoselective effects of chiral clofibric acid analogs on rat peroxisome proliferator-activated receptor α (rPPARα) activation and peroxisomal fatty acid β-oxidation (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 37-47 
    Details
    ISSN: 0899-0042
    Keywords: stereoselectivity ; fatty-acyl CoA oxidase ; H4IIEC3 cells ; CV-1 cells ; structure-activity relationships ; absolute configuration assignment ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enantiomers of a series of substituted analogs of 2-(4-chloronhenoxy)-acetic acid (CPAA) were synthesized and used to examine the influence of steric and structural parameters on peroxisome proliferation. The effects of these compounds were studied on the activation of the peroxisome proliferator-activated receptor α (PPARα) in CV-1 cells using an in vitro co-transfection assay. Selected sets of isomers were tested for their ability to increase peroxisomal fatty acyl-CoA oxidase (ACO) activity in H4IIEC3 (rat Reuber hepatoma) cells. Of the series of 2-substituted analogs studied, the isomers of the n-propyl and phenyl derivatives of CPAA showed a high degree of stereoselectivity [(S)-isomer ≫ (R)-isomer]. In general, the potency of the compound to activate the receptor increased with the size of the 2-alkyl substituent. Among the 4-chlorobenzyloxy- and 4-(4′-chlorophenyl)benzyloxy- analogs studied, 2-[4-(4′-chlorophenyl)-benzyloxy]-propanoic acid exhibited a high degree of stereoselectivity in both the biological systems studied [(R) ≫ (S)]. The congeners of 2-methyl substituted CPAA showed a reverse stereoselectivity [(R) 〉 (S)] as compared to the other 2-substituted analogs [(S) 〉 (R)]. Our results indicate that (1) both structural and steric characteristics of CPAA analogs play an important role in the activation of rPPARα and on stimulation of peroxisomal ACO activities, and (2) clofibric acid and analogs exert their peroxisome proliferative effects by interaction with a specific site on a protein. The enantiomers of the 2-n-propyl and the 2-phenyl CPAA analogs may be useful as mechanistic probes in elucidating the nature of this binding site. Chirality 9:37-47, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Stereoselectivity in central analgesic action of tocainide and its analogs (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 5 (1993), S. 135-142 
    Details
    ISSN: 0899-0042
    Keywords: antiarrhythmic drug ; tocainide ; antinociceptive activity ; chiral analogs ; presynaptic receptor ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The antiarrhythmic drug tocainide (5a) and some related chiral α-amino and α-imino anilides (5b-e) were synthesized in optically active form. The antinociceptive effects of the different stereoisomers of these compounds were examined and it was found that the analgesic effect of tocainide is due only to its (-)-(R)-enantiomer. Benzyl replacement for methyl group at the stereogenic centre of tocainide causes loss of activity while both enantiomers of the αiminoxilidide 5e and of the strictly related tocainide analog 5d produce an analgesic effect without any stereoselectivity. Pharmacological tests and [3H] quinuclidinyl benzilate ([3H]QNB) binding assay, taken together, seem to show that the antinociceptive effect of (-)-(R)-tocainide, like the analgesia induced by lidocaine, procaine, and mexiletine, is due to a central presynaptic cholinergic mechanism of action. © 1993 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530050306
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  • 3
    Electronic Resource
    Electronic Resource
    Stereospecific synthesis and absolute configuration of mexiletine (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 6 (1994), S. 590-595 
    Details
    ISSN: 0899-0042
    Keywords: antiarrhythmic drug ; mexiletine ; absolute configuration ; X-ray analysis ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Data on the absolute configuration of mexiletine (MEX) do not appear to have been published, although in several published reports the configuration is referred to as (-)-(R) and (+)-(S), based on information from manufactures providing the drug stereoisomers. We demonstrate that (-)-MEX has the (R)-configuration by mean of a new stereospecific synthesis. X-Ray analysis of an optical active sample of (+)-MEX as its hydrobromide salt, obtained from chemical resolution of the racemic mixture, was carried out in order to obtain precise information on bond lengths and angles, useful for studies on structure-activity relationships. We also report the NMR analysis in presence of Eu(hfc)3 as shift reagent, which represents a simple method for the determination of enantiomeric excess (ee) in addition to the well-known chiral HPLC methods. © 1994 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530060713
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamic mechanical behaviour of linear polyamides with different degree of unsaturation in the chain (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 201-207 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dynamic mechanical behaviour of polyamide systems containing different degrees of unsaturation was analyzed. The results do not show any simple relation between unsaturation and mechanical response. Particular attention was given to the α-transition, that is a glass transition, and experimental data suggest that the generally accepted mechanism for this transition requires a more extensive study.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790120
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