Results 171 to 180 of about 1,421 (204)
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New depsidones from Lobaria oregana
Phytochemistry, 1980Abstract 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) +3 more
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A new depsidone from Usnea diffracta
Chinese Chemical Letters, 2009Abstract 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 +2 more
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ψ-esters of depsidones with a lactole ring
Phytochemistry, 1987Abstract 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, 1976The 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 +3 more
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The Structure of the Lichen Depsidones Fulgidin and Isofulgidin
Australian Journal of Chemistry, 1990The 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, 1970Abstract 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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Cytotoxic Prenylated Depsidones from Garcinia parvifolia
Journal of Natural Products, 2000Leaf extracts of Garcinia parvifolia provided relatively high yields of four novel, cytotoxic prenylated depsidones. The structures were determined mainly by detailed NMR spectral analysis and X-ray crystallography.
Xu, Y.-J. +7 more
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Journal of the Chemical Society, Perkin Transactions 1, 1981
The isolation, from the lichen Buellia canescens(Dicks.) De Not., and structural determination of the new depsidones 2,7,9-trichloro-3-hydroxy-8-methoxy-1,6-dimethyldibenzo[b,e][1,4]dioxepin-11-one (dechlorodiploicin)(1) and its methyl ether dechloro-O-methyldiploicin (9), together with the novel phthalides 4-chloro-7-(3,5-dichloro-4,6-dimethoxy-2 ...
Tony Sala +2 more
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The isolation, from the lichen Buellia canescens(Dicks.) De Not., and structural determination of the new depsidones 2,7,9-trichloro-3-hydroxy-8-methoxy-1,6-dimethyldibenzo[b,e][1,4]dioxepin-11-one (dechlorodiploicin)(1) and its methyl ether dechloro-O-methyldiploicin (9), together with the novel phthalides 4-chloro-7-(3,5-dichloro-4,6-dimethoxy-2 ...
Tony Sala +2 more
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A theory of biogenesis of lichen depsides and depsidones
Proceedings of the Indian Academy of Sciences - Section A, 1944Lichen depsides and depsidones are considered to arise from a common source (XIV) which originates from aldol condensation between a hexose and a biose and elimination of water. Oxidation and reduction lead to various modifications of this C8 unit and increase in the length of the sidechain arises from condensation with simple sugars and reduction ...
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ChemInform Abstract: DEPSIDONE SYNTHESIS. PART 19. SOME β‐ORCINOL DEPSIDONES
Chemischer Informationsdienst, 1981T. SALA, M. V. SARGENT
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