Results 151 to 160 of about 911 (189)

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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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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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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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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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
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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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Depsidone synthesis. VII. Vicanicin and norvicanicin

Australian Journal of Chemistry, 1976
The lichen Psoroma sphinctrinurn (Mont.) Nyl. occurs in two or more chemical strains. 2,7-Dichloro- 3 - hydroxy -8-methoxy- 1,4,6,9 - tetramethyl - 11H- dibenzo[b,e][l,4]dioxepin- 11-one (vicanicin) (2), a known depsidone, is a metabolite of one strain, and 2,7-dichloro-3,8-dihydroxy-1,4,6,9-tetramethyl-1lH-dibenzo[b,e][1,4]dioxepin-11-one ...
MV Sargent, P Vogel, JA Elix, BA Ferguson   +3 more
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The Structure of the Lichen Depsidones Fulgidin and Isofulgidin

Australian Journal of Chemistry, 1990
The depsidone isofulgidin (1) (2,4,7-trichloro-3-hydroxy-8-methoxy-1,6-dimethyl-11H-dibenzo-[ b,el [1,4]dioxepin-11-one), has been isolated from the lichen Rinodina dissa together with atranorin and diploicin (3). lsofulgidin (1) has also been detected in the lichens Hafellia parastata and Fulgensia canariensis.
AA Birkbeck, MV Sargent, JA Elix
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Loxodin, a depsidone of lichens of Parmelia species

Phytochemistry, 1970
Abstract Loxodin isolated from Parmelia flavescentireagens Gyel. and some other lichens of Parmelia spp. was shown to be methyl norlobarate (I).
T. Komiya, S. Kurokawa
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