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Chemical modification of usnic acid 2. Reactions of (+)-usnic acid with amino acids

✍ Scribed by O. A. Luzina; M. P. Polovinka; N. F. Salakhutdinov; G. A. Tolstikov

Publisher
Springer
Year
2007
Tongue
English
Weight
290 KB
Volume
56
Category
Article
ISSN
1573-9171

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ChemInform Abstract: Chemical Modification of Usnic Acid. Part 3. Reaction of (+)-Usnic Acid with Substituted Phenylhydrazines.
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## Abstract The reaction of (+)‐usnic acid (I) with arylhydrazines (II) leads to the fused pyrazole derivatives (III), whilst the reaction with nitrophenylhydrazines (V) gives rise to hydrazones (V).

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Usnic acid (I), one of the most common lichen metabolites, is of considerable interest because of its inhibitory effect on Gram-positive bacteria. 293 The only successful

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Usnic acid , a yellow colouring matter which is widely distir$buted in lichens , particularly in Usnea , Cladonia, Rvernia ana Parmelia , had long been investigated by several workers, and the structure (III) (1,2) was unequivocally confirmed by the