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Beiträge zur Chemie von Tetraketonen, III Synthese und einige Reaktionen des 1,6-Bis(p-hydroxyphenyl)-1,3,4,6-hexantetrons

✍ Scribed by Kovač, Spomenka ;Rapić, Vladimir ;Laćan, Marijan


Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
212 KB
Volume
1984
Category
Article
ISSN
0947-3440

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✦ Synopsis


Contributions to the Chemistry of Tetraketones, III. ‐ Synthesis and Some Reactions of 1,6‐Bis(p‐hydroxyphenyl)‐1,3,4,6‐hexanetetrone

Condensation 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.


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