Results 161 to 170 of about 2,321 (211)

The Identification of Gyrophoric Acid, a Phytochemical Derived from Lichen, as a Potent Inhibitor for Aggregation of Amyloid Beta Peptide: In Silico and Biochemical Evaluation. [PDF]

Int J Mol Sci
Yang M, Hu H, Gao J, Lai QWS, Eshboev F, Leung KW, Dong TT, Xu Q, Tsim KWK.   +8 more
europepmc   +1 more source

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Antioxidant activity of depsides and depsidones

Phytochemistry, 1994
The antioxidant activity of lichenic metabolites, depsides and depsidones, was assessed by their effects as inhibitors of rat brain homogenate auto-oxidation and beta-carotene oxidation. The results obtained in both systems indicate that lichenic metabolites afford a moderate protection in the microM concentration range. The largest effect was measured
W Quilhot, E Lissi
exaly   +3 more sources

Tert-butanolysis of lichen depsides

Phytochemistry, 1984
Abstract The scope and limit of the tert-butanolysis of 12 lichen depsides is described. Neither 2-O-methylated nor 2-O-acetylated compounds are cleaved by heating with tert-butanol.
exaly   +2 more sources

Biosynthesis of Depsides, Depsidones, and Diphenyl Ethers from Fungi and Lichens

Asian Journal of Organic Chemistry
Depsides are natural products derived from (poly)phenolic acid derivatives connected by ester bonds. Recent research has revealed crucial molecular mechanisms and distinctive enzymatic chemistry underlying the biosynthesis of depsides, as well as related natural products, such as depsidones and diphenyl ethers.
Qiaolin Ji, Yudai Matsuda
exaly   +2 more sources

Synthesis of Further Lichen Depsides

Australian Journal of Chemistry, 1993
The unambiguous total synthesis of 18 lichen depsides has been achieved by the condensation of an appropriately substituted orsellinic acid and protected phenol in the key step, followed by subsequent deprotection and/or secondary reduction. The natural occurrence of the first meta-depside involving substitution at the 5??-position of the B-ring has ...
JA Elix, CE Barclay, F David, FK Griffin, AM Hill, DB Mcconnell, JH Wardlaw   +6 more
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Depsides in Sunflower Leaves

Nature, 1966
THIS communication reports our finding of neochlorogenic, isochlorogenic, and 3-O-feruloylquinic acids in the leaves of sunflowers, Helianthus annuus, Russian Mammoth variety. The well-known chlorogenic acid (3-O-caffeoylquinic acid) has been previously found in sunflowers by Urban1 and its presence there has been confirmed by Watanabe et al ...
A. ZANE, S. H. WENDER
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Methyl β-Orcinolcarboxylate and Depsides from Parmelia furfuracea

Journal of Natural Products, 1985
Parmelia furfuracea, a common conifer lichen, produce antimicrobical constituents whose extracts have been utilized to give base materials for perfumes. Crude extracts of this lichen were tested against representative different class of microorganisms.
Caccamese, S., TOSCANO, Rosa Maria, Bellesia, F. b, Pinetti, A.   +3 more
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Depsides from the Petals ofPapaver rhoeas

Planta Medica, 2004
Two new depsides as well as the known p-hydroxybenzoic acid and its methyl ester, protocatechuic acid, 2-(4-hydroxyphenyl)-ethanol, 2-(3,4-dihydroxyphenyl)-ethanol and the flavonoids kaempferol, quercetin, luteolin and hypolaetin and the glycosides 3- O-beta- D-glucopyranosylquercetin (isoquercitrine), 3- O-beta- D-glucopyranosylkaempferol (astragaline)
Marita, Hillenbrand, Josef, Zapp, Hans, Becker   +2 more
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Synthesis of the lichen depsides pseudocyphellarin A and B

Australian Journal of Chemistry, 1984
The total synthesis of the fully substituted lichen depsides, pseudocyphellarin A (3-hydroxy-4-methoxycarbonyl-2,5,6-trimethylphenyl 3-formyl-2,4-dihydroxy-5,6-dimethylbenzoate) (1) and pseudocyphellarin B (3-hydroxy-4-methoxycarbonyl-2,5,6-trimethylphenyl 2,4-dihydroxy-3-hydroxymethyl-5,6-dimethylbenzoate) (2) is described.
JA Elix, L Lajide
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