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  • Organic Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 387-395 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sila-Pharmaca, 22 Organophosphates with Anticholinesterase Activity and their Sila-AnaloguesThe organophosphates 1a-4a and their sila-analogues 1b-4b of the type R1R2P(O)-(p-OC6H4ElMe3) (El = C, Si) were synthesized. With regard to their anticholinesterase activity, the carbon compounds 1a-4a exhibit the same structure-activity relationships as the silicon compounds 1b-4b. The latter are more activ than the corresponding C-analogues.
    Notes: Die Organophosphorsäureester 1a-4a und ihre Sila-Analoga 1b-4b des Typs R1R2P(O)-(p-OC6H4ElMe3) (El = C, Si) wurden synthetisiert. Die Kohlenstoff-Verbindungen 1a-4a zeigen hinsichtlich ihrer Anticholinesterase-Aktivität die gleichen Struktur-Wirkungs-Beziehungen wie die Silicium-Verbindungen 1b-4b. Letztere sind jeweils wirksamer als die entsprechenden C-Analoga.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sila-Pharmaca, 30. - (2-Aminoethyl)cycloalkylphenylsilanols: Bioisosteric C/Si Exchange in Parasympatholylics of the Trihexyphenidyl, Cycrimine, and Procyclidine TypeThe synthesis of the (2-aminoethyl)cycloakylphenylsilanols 5b (sila-trihexyphenidyl), 6b (Sila-cycrimine), 7b (sila-procyclidine), and 8b is described. Starting with CI2(C6H5)SiCh—CH2(9), 5b-8b were obtained by five reaction steps with a total yield of 32-40%. The C/Si pairs 5a,b-8a,b, were tested for antimuscarinic activity on the isolated guinea-pig ileum. The increase of affinity of the muscarinic receptor caused by sila-substitution of 5a-8a is less marked than in the case of the structurally related C/Si 1a,b-4a,b.
    Notes: Die Synthese der (2-Aminoethyl)cycloalkylphenylsilanole 5b (Sila-Trihexyphenidyl), 6b (Sila-Cycrimin), 7b (Sila-Procyclidin) und 8b wird beschrieben. 5b-8b wurden - ausgehend von Ci2(C?6H5)SiCCCCH—CH2 (9) - durch eine fünfstufige Reaktionsfolge mit einer Gesamtausbeute von 32-40% erhalten. Am isolierten Ileum des Meerschweinchens wurden die C/Si-Paare 5a,b-8a,b vergleichend auf ihre antimuskarinische Aktivität geprüft. Die durch die Sila-Substitution von 5a-8b erreichte Zunahme der Affinität zum Muskarinrezeptor ist deutlich weniger ausgeprägt als bei den strukturverwandten C/Si-Paaren 1a,b-4a,b.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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