Journal ArticleDOI
Dimeric chromenes and mixed dimers of a chromene with euparin from Encelia canescens
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TLDR
In this paper, the structure of Encelia canescens was elucidated hy high field 1 H NMR spectroscopy, revealing four new dimeric p-hydroxyacetophenone derivatives, two epimeric chromene dimers and two Epimeric mixed dimers of euparin and encecalin.About:
This article is published in Phytochemistry.The article was published on 1983-01-01. It has received 18 citations till now. The article focuses on the topics: Tremetone.read more
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Astonishing Diversity of Natural Peroxides as Potential Therapeutic Agents
TL;DR: Intensive searches for new classes of biologically active metabolites produced by terrestrial and marine origin have resulted in the discovery of dozens of compounds possessing high antimalarial, antibacterial, cytotoxic, and other pharmacological activities as an important source of leads for drug discovery.
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Chromenes from Ageratina arsenii and revised structures of two epimeric chromene dimers
TL;DR: Agrostophyllin, the first naturally occurring phenanthropyran derivative, was isolated from the orchid Agroophyllum khasiyanum as mentioned in this paper, and it was shown to be a phenotypic indicator of the presence of humans.
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Chromans from helianthella quinquenervis
TL;DR: In this paper, the investigation of Helianthella quinquenervis afforded, in addition to several known 6-acetylchromenes, 3-prenyl-4-hydroxyphenone and the benzofuran encecalin, cis - and trans -2,2-dimethyl-3,4,7-trihydroxy-6- acetylchroman.
Journal ArticleDOI
Systematic implications of chromenes and benzofurans from Encelia (asteraceae)
Peter Proksch,Curtis Clark +1 more
TL;DR: Phytochemical analysis of Encelia species yielded numerous chromene and benzofuran derivatives that are thought to reflect the phylogeny of the genus and paralleled those based on recent morphological and anatomical findings.
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Natural products from Tolpis barbata (L.) Gaertn. (Asteraceae, Cichorieae)
TL;DR: Five known phenolic compounds, namely: esculin, esculetin, chlorogenic acid, luteolin 7- O -glucoside and 3,5-dicaffeoylquinic acid (3-5-DCQA) were identified as major constituents of Tolpis barbata (L.) Gaertn, hitherto unexamined species.
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Neue Isopentenyl‐acetophenon‐Derivate aus Helianthella uniflora
TL;DR: In this paper, the authors discuss the biogenetical relationships between the tetrahedron of Helianthella uniflora and the acetophenone derivatives of the genus.
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Über Inhaltsstoffe der Gattung Flourensia
Ferdinand Bohlmann,Michael Grenz +1 more
TL;DR: In this paper, two species of the genus Flourensia have been investigated and their structures have been elucidated by spectroscopic methods, besides the already known characteristic 4-hydroxyacetophenone derivatives.
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Zwei neue guajanolide sowie weitere longipinenester aus Stevia-arten
Ferdinand Bohlmann,Ferdinand Bohlmann,Lakshmi N. Dutta,Lakshmi N. Dutta,Wolfgang Dorner,Wolfgang Dorner,Robert M. King,Robert M. King,Harold Robinson,Harold Robinson +9 more
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Euparinoid constituents of Encelia californica
L.F. Bjeldanes,T.A. Geissman +1 more
TL;DR: Encelia californica Nutt (Compositae, tribe Heliantheae) contains euparin and two new compounds of related constitution and no sesquiterpene lactones were found.