Eudesmane Derivatives from Verbesina turbacensis

Amaro-Luis, Juan M.; Ramírez, Irama; Delgado-Méndez, Paulino; Jorge, Zacarías D.

doi:10.1590/s0103-50532002000300010

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…In each case, each chemical class ( Fig. 1) was represented by a three-letter abbreviation (see Table 1; Ma et al, 1997;Dai et al, 2001;Amaro-Luis et al, 2002;Bruno et al, 2002;Flamini et al, 2002;Gunawardena et al, 2002;Hikawczuk et al, 2002;Janackovic et al, 2002;Kim et al, 2002).…”

Section: Methodsmentioning

confidence: 99%

Prediction of occurrences of diverse chemical classes in the Asteraceae through artiﬁcial neural networks

Ferreira

Brant

Rufino

et al. 2004

Phytochemical Analysis

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The training and the application of a neural network system for the prediction of occurrences of secondary metabolites belonging to diverse chemical classes in the Asteraceae is described. From a database containing about 604 genera and 28,000 occurrences of secondary metabolites in the plant family, information was collected encompassing nine chemical classes and their respective occurrences for training of a multi-layer net using the back-propagation algorithm. The net supplied as output the presence or absence of the chemical classes as well as the number of compounds isolated from each taxon. The results provided by the net from the presence or absence of a chemical class showed a 89% hit rate; by excluding triterpenes from the analysis, only 5% of the genera studied exhibited errors greater than 10%.

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Section: Methodsmentioning

confidence: 99%

Prediction of occurrences of diverse chemical classes in the Asteraceae through artiﬁcial neural networks

Ferreira

Brant

Rufino

et al. 2004

Phytochemical Analysis

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“…The title compound was isolated in its ester and acid forms by Bohlmann & Lonitz (1978) and Amaro-Luis et al (2002), respectively. For related literature concerning the sesquiterpene derivatives extracted from the Asteraceae family of plants, see: Castro et al (2000); Amaro-Luis et al (2002); Wagner et al (2004); Stefani et al (2006).…”

Section: Related Literaturementioning

confidence: 99%

6α-Cinnamoyloxyeudesman-15-oic acid

et al. 2007

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The structure of the title compound [systematic name: (1R,4aS,7R,8S,E)‐8‐cinnamoxyloxy‐7‐isopropyl‐4a‐methyldecahydronaphthalene‐1‐carboxylic acid], C24H32O4, isolated from Verbesina turbacensis collected in Costa Rica, shows a eudesman sesquiterpene skeleton with normal values of bond lengths and angles. In the crystal structure, the hydroxy group is involved in the formation of intermolecular O—H...O hydrogen bonds, which link the molecules into zigzag chains extended along the [001] direction.

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“…4 The simpler eudesmanes B and C have also been isolated, with more examples recorded in the literature. [5][6][7] Scheme 2 presents some eudesmanes which have been synthesized recently, and taken together Schemes 1 and 2 demonstrate the current interest in these apparently simple structures. The synthetic challenges involve the construction of the decalin bicyclic array in both transand cis-ring fusions, with provision for the incorporation of functional group substitutions at several of the ring carbon atoms.…”

Section: Introductionmentioning

confidence: 98%