Results 141 to 150 of about 796 (189)

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, Eduardo Lissi
exaly   +3 more sources

Depsidones from Anomalographis madeirensis

Biochemical Systematics and Ecology, 1999
0 ...
Jaime Bermejo
exaly   +3 more sources

Salazinic Acid-Derived Depsidones and Diphenylethers with α-Glucosidase Inhibitory Activity from the Lichen Parmotrema dilatatum

Planta Medica, 2020
International audienceThree new depsidones, parmosidones F - G (1 - 2), and 8'-O-methylsalazinic acid (3), and 3 new diphenylethers, parmetherines A - C (4 - 6), together with 2 known congeners were isolated from the whole thalli of , a foliose ...
Thuc-Huy Duong, Solenn Ferron, Mehdi A Beniddir   +2 more
exaly   +2 more sources

Depsidone synthesis. Part 19. Some β-orcinol depsidones

J. Chem. Soc., Perkin Trans. 1, 1981
The synthesis of the lichen depsidones 3,8-dihydroxy-1,4,6,9-tetramethyl-11-oxo-11H-dibenzo[b,e][1,4]-dioxepin-7-carboxylic acid (hypoprotocetraric acid)(4), 8-hydroxy-3-methoxy-1,4,6,9-tetramethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylic acid (O-methylhyprprotocetraric acid)(5), 4-formyl-3,8-dihydroxy-1,6,9-trimethyl-11-oxo-11H-dibenzo[b,e][1,
Tony Sala, Melvyn V. Sargent
openaire   +2 more sources

Depsidone synthesis. Part 11. Synthesis of some fungal depsidones related to nidulin

Journal of the Chemical Society, Perkin Transactions 1, 1978
The synthesis of 3-hydroxy-8-methoxy-1,9-dimethyl-6-(s-butyl)dibenzo[b,e][1,4]dioxepin-11-one (tridechlorodihydronidulin)(34), a derivative of the fungal depsidone nidulin (1), and of 3,8-dihydroxy-1,9-dimethyl-6-(s-butyl)dibenzo[b,e][1,4]dioxepin-11-one (tridechlorodihydro-O-nornidulin)(39), a derivative of the fungal depsidone tridechloro-O ...
Peter Djura, Melvyn V. Sargent
openaire   +2 more sources

Discovery of Depsides and Depsidones from Lichen as Potent Inhibitors of Microsomal Prostaglandin E2 Synthase‐1 Using Pharmacophore Models

ChemMedChem, 2012
International audienceNature in silico: Virtual screening using validated pharmacophore models identified lichen depsides and depsidones as potential inhibitors of mPGES-1, an emerging target for NSAIDs.
Julia Bauer, Birgit Waltenberger, Stefan M Noha   +2 more
exaly   +2 more sources

Structure of the lichen depsidone pannarin

Journal of the Chemical Society, Chemical Communications, 1974
The published structure of pannarin{2-chloro-6-hydroxy-3-methoxy-1,4,8-trimethyl-11-oxo-11H-dibenzo[b,e]-[1,4]dioxepin-7-carbaldehyde}(1) is revised to 2-chloro-3-hydroxy-8-methoxy-1,6,9-trimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-4-carbaldehyde (21), in the light of a combination of degradative, spectroscopic, and synthetic studies.
David A. Jackman, Melvyn V. Sargent, John A. Elix   +2 more
openaire   +1 more source

Depsidones from an Endophytic Fungus Chaetomium sp. Associated with Zanthoxylum leprieurii

Zeitschrift Fur Naturforschung - Section B Journal of Chemical Sciences, 2013
A new depsidone, namely chaetosidone A (1), together with six known fungal metabolites were obtained from a culture of Chaetomium sp., an endophytic fungus isolated from Zanthoxylum leprieurii leaves.
Clovis Douanla-Meli, Hartmut Laatsch
exaly   +2 more sources

Depsidones from the Endophytic Fungus BCC 8616

Journal of Natural Products, 2006
Three new depsidones (1-3) have been isolated from the endophytic fungus BCC 8616 and their structures analyzed on the basis of spectroscopic data interpretation. Compound 1 exhibited weak cytotoxic activity against breast and epidermoid carcinoma cell lines.
Pattama, Pittayakhajonwut, Aibrohim, Dramae, Siribhorn, Madla, Nattapat, Lartpornmatulee, Nattawut, Boonyuen, Morakot, Tanticharoen   +5 more
openaire   +2 more sources

Structure of the lichen depsidone gangaleoidin

Journal of the Chemical Society, Perkin Transactions 1, 1975
As a result of degradative, spectroscopic, and synthetic evidence the structure of the lichen depsidone gangaleoidin is revised to methyl 2,4-dichloro-3-hydroxy-8-methoxy-1,6-dimethyl-11-oxo-11H-dibenzo [b,e][1,4]dioxepin-7-carboxylate. Gangaleoidin was degraded to methyl 3-(2-methoxycarbonyl-5-methoxy-3-methylphenoxy)-4,6-dimethoxy-2-methylbenzoate ...
Melvyn V. Sargent, Paul Vogel, John A. Elix   +2 more
openaire   +1 more source