Natürlich vorkommende Cumarin‐Derivate, IX1) Über die Inhaltsstoffe der Gattung Gerbera
TL;DR: The roots of Gerbera species contain known polyynes 1 and 2 as discussed by the authors, and two new coumarins (4 and 7) were isolated, the structures being elucidated by spectroscopic data as well as by synthesis.
Abstract: Die Wurzeln mehrerer Gerbera-Arten enthalten die bekannten Polyine 1 und 2. Aus Gerbera crocea wurden zusatzlich das Acetophenon-Derivat 3 und zwei neue Cumarine (4 und 7) isoliert, deren Strukturen durch spektroskopische Daten sowie durch Synthese geklart werden.
Naturally Occuring Coumarin Derivatives, IX1) On the Constituents of the Genus Gerbera
The roots of several Gerbera species contain the known polyynes 1 and 2. In addition from Gerbera crocea the acetophenon derivative 3 and two new coumarins (4 and 7) were isolated, the structures being elucidated by spectroscopic data as well as by synthesis.
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TL;DR: The investigation of twelve further species of the Eupatorium complex affords four new germacrolides and seven guaianolides together with new thymol and p-hydroxyacetophenone derivatives as discussed by the authors.
86 citations
TL;DR: 7-hydroxycoumarin [umbelliferone, (2)], one of the most widely distributed coumarins, is often regarded as the parent, in a structural sense and also biogenetically, of a large number of the structurally more complex coumarin.
Abstract: Over the past 150 years, since Vogel in 1820 isolated the parent oxygen heterocycle, coumarin (1) from Coumarouna odorata = Dipteryx odorata (1), coumarins have been recognized as widely distributed plant products. The vast majority carry an oxygen substituent at C-7; consequently 7-hydroxycoumarin [umbelliferone, (2)], one of the most widely distributed coumarins, is often regarded as the parent, in a structural sense and also biogenetically, of a large number of the structurally more complex coumarins. A number of review articles on natural plant coumarins have appeared (154, 302, 344, 420, 525, 541, 548) since the last in this series (153), the most comprehensive, albeit dealing solely with coumarins of the Umbelliferae, being that of Nielsen in 1970 (419).
77 citations
TL;DR: In this paper, the authors investigated four species from the subtribe Mutisiinae and found eight new monoterpenes, seven 5-methyl coumarins, two closely related 5methyl chromones, two coumarane derivatives, a p-hydroxy acetophenone derivative and a new C14-acetylene.
66 citations
TL;DR: An investigation of nine representative species of the tribe Mutisieae yielded some new results of chemotaxonomic interest, including some new sesquiterpenes and coumarins characterised by spectroscopic methods.
63 citations
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62 citations
TL;DR: In this paper, it was shown that pyrolysis of the natural coumarin, 1, has been shown to give obliquetin, nieshoutin, 3, and the out-of-ring rearrangement product, 10.
38 citations
TL;DR: The investigation of numerous members of the tribe Inuleae shows that the pentaynene 1 here is very widespread as mentioned in this paper, while from Stoebe plumosa two new p-hydroxyacetophenone derivatives (4 and 5) have been isolated.
Abstract: Die Untersuchung zahlreicher Vertreter der Tribus Inuleae zeigt, das das Pentain-en 1 hier sehr verbreitet ist. Osmites hirsuta enthalt dagegen C10-Acetylene (2 und 3), wahrend aus Stoebe plumosa zwei neue p-Hydroxy-acetophenon-Derivate (4 und 5) isoliert werden.
Polyacetylenic Compounds, 210. Further Constituents of the Tribe Inuleae
The investigation of numerous members of the tribe Inuleae shows that the pentaynene 1 here is very widespread. Osmites hirsuta however contains C10-acetylenes (2 and 3), while from Stoebe plumosa two new p-hydroxyacetophenone derivatives (4 and 5) have been isolated.
11 citations