Results 141 to 150 of about 1,299 (187)

ChemInform Abstract: DEPSIDONE SYNTHESIS. PART 11. SYNTHESIS OF SOME FUNGAL DEPSIDONES RELATED TO NIDULIN

Chemischer Informationsdienst, 1978
AbstractAusgehend von Oxo‐sulfon (Ia) wird sukzessiv über die angegebenen Stufen das Benzophenon (VIIb) synthetisiert, aus dem durch oxidative Kupplungsreaktion und nachfolgende Debromierung Tridechlordihydro‐nidulin (VIIIb) gewonnen wird.
P. DJURA, M. V. SARGENT
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Depsidones and diaryl ethers from potato endophytic fungus Boeremia exigua.

Fitoterapia, 2020
Three depsidones boremexins A-C (1-3), two diaryl ethers boremexins D (4) and E (5), together with four known compounds were obtained from cultures of potato endophytic fungus Boeremia exigua.
Yao Chen, Li-Tang Sun, Hui-Xiang Yang, Zheng-Hui Li, Jikai Liu, Hong-Lian Ai, Guo-Kai Wang, Tao Feng   +7 more
semanticscholar   +1 more source

Bioactive Depsidones from the Fungus Pilobolus heterosporus

Planta Medica, 2014
A new aromatic ester, pilobolusate (1), four new depsidones, pilobolusones A-D (2-5), five known depsidones, (6-10), and ergosterol were isolated from the fungus Pilobolus heterosporus. Their structures were established on the basis of spectroscopic data.
Oue-artorn, Rajachan, Somdej, Kanokmedhakul, Kwanjai, Kanokmedhakul, Kasem, Soytong   +3 more
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Depsidone synthesis. III. Grayanic acid

Australian Journal of Chemistry, 1976
The structure of the lichen depsidone grayanic acid (1) (6-heptyl-8-hydroxy-3-methoxy-1-methyl-11- oxo-11 H -dibenzo[b,e][1,4]dioxepin-7-carboxylic acid) proposed by Shibata and Chiang was confirmed by the synthesis firstly of methyl O -methylgrayanate (19), and then of grayanic acid itself. The key step in both syntheses was an Ullmann reaction.
P Djura, MV Sargent
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From Symbiosis to Cytotoxicity: Biosynthesis, Molecular Mechanisms, and Anticancer Potential of Lichen‐Derived Depsides and Depsidones

Chemistry and Biodiversity
Lichen is a unique symbiotic organism that consists of fungi and photosynthetic algae and or cyanobacteria. They are known for producing a large repository of secondary metabolites, among which depsides and depsidones gain pharmacological interest.
Sachin V. Mapari, S. Gaikwad, Ruchira R. Sutar, Ravindra M. Patil, Bhaskar C. Behera   +4 more
semanticscholar   +1 more source

Depsidones and fatty acids of Parmelia stygia

Phytochemistry, 1984
Abstract One Russian sample of the lichen Parmelia stygia has yielded fumarprotocetraric acid, while a second contained the same compound accompanied by colensoinic, lobaric, caperatic and norcaperatic acids.
Nataliya P. Mishchenko, Oleg B. Maximov, Olga E. Krivoshchekova, Ljudmila S. Stepanenko   +3 more
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Depsidone synthesis. VI. Colensoic acid

Australian Journal of Chemistry, 1976
The synthesis of the lichen depsidone colensoic acid (1) (8-hydroxy-3-methoxy-11-oxo-1,6-dipentyl- 11H-dibenzo[b,e][l,4]dioxepin-7-carboxylic acid) by Ullmann reaction of benzyl-2-bromo-4-methoxy- 6-pentylbenzoate (18) and methyl 4,6-dibenzyloxy-3-hydroxy-2-pentylbenzoate (27) and subsequent steps is described.
P Djura, MV Sargent
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A new depsidone from Usnea diffracta

Chinese Chemical Letters, 2009
Abstract A new depsidone, diffractione A ( 1 ), as well as six known phenolic compounds ( 2 – 7 ) were isolated from Usnea diffracta . Their structures were elucidated by 1D and 2D NMR spectroscopy together with HRESIMS analysis. All components were obtained for the first time from U. diffracta.
Huan Yang Qi, Yuan Peng Jin, Yan Ping Shi   +2 more
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ψ-esters of depsidones with a lactole ring

Phytochemistry, 1987
Abstract The reaction of stictic, norstictic and salazinic acids with methanol, ethanol and tert-butanol has been investigated. 8′- O -Methylstictic acid is identical with methylstictic acid from Lobaria oregana . Ingolfdottir's vesuvianic acid from Stereocaulon vesuvianum and Handong's cetrariastrumin from Cetrariastrum nepalensis have been ...
Siegfried Huneck, Raffaele Tabacchi
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New depsidones from Lobaria oregana

Phytochemistry, 1980
Abstract From the lichen, Lobaria oregana , two new minor metabolises, methylstictic acid ( 4 ) and cryptostictic acid ( 5 ) were isolated. The structures of 4 and 5 were elucidated by 1 H NMR and MS analysis.
Sachiko Shimada (née Miyoshi), Tamotsu Saitoh, Ushio Sankawa, Shoji Shibata   +3 more
openaire   +1 more source