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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1755-1758 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Tetraketones, III. - Synthesis and Some Reactions of 1,6-Bis(p-hydroxyphenyl)-1,3,4,6-hexanetetroneCondensation of p-hydroxyacetophenone and diethyl oxalate in the presence of sodium ethoxide gave the tetraketone 3 which can be cyclized with o-phenylenediamine, hydrazine, or phenyl-hydrazine to yield the quinoxaline 1 or the 3,3′-bipyrazolyl derivatives 5 and 6, respectively. Transformation of the p-hydroxyphenyl group in compounds 1 and 3 with methyl isocyanate/triethylamine gave the corresponding carbamates 2 and 4. By condensation of 4 with hydrazine or phenylhydrazine the pyrazoles 7 and 8 were prepared. Compounds 4, 7, and 8 showed no progressive inhibitory properties against acetylcholinesterase.
    Type of Medium: Electronic Resource
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