Journal ArticleDOI
Neolignans from stem bark of ocotea veraguensis
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TLDR
The stem bark of Ocotea veraguensis has yielded nine neolignans of which five appear to be novel as discussed by the authors, which were identified on the basis of spectral characteristics.About:
This article is published in Phytochemistry.The article was published on 1987-01-01. It has received 18 citations till now.read more
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Neolignans, styrylpyrones and flavonoids from an Aniba species
TL;DR: The trunk wood and barks from an Aniba species contain four esters of benzoic acid with cinnamyl alcohol, five benzofuran neolignans, licarin-A, burchellin, cis-burchellin-rearranged and cis-Burchellin rearranged, one tetrahydro-furan neogenan, aristolignin, three bicyclooctane guianin-type neogenans, (7 S, 8 S, 1′ R, 4′ R, 5′ S )-4,
Journal ArticleDOI
Leaf essential oil composition of 10 species of Ocotea (Lauraceae) from Monteverde, Costa Rica
TL;DR: Leaf essential oils of 10 species of Ocotea from Monteverde, Costa Rica have been obtained by hydrodistillation and analyzed by GC–MS in order to discern the differences and similarities between the volatile chemical compositions of these species.
Journal ArticleDOI
Neolignans and alkaloids from Piper argyrophylum
Sanjay K. Singh,Prasad K. Ashok,Carl Erik Olsen,Amitabh Jha,Subhash C. Jain,Virinder S. Parmar,Jesper Wenge +6 more
TL;DR: The structure of the new neolignan, 4-(2-piperonyl-2-hydroxy-1-methylethyl-2,5-dimethoxy-2-(2propenyl)-3,5 -cyclohexadien-1.1-one, was elucidated on the basis of its spectral data as discussed by the authors.
Journal ArticleDOI
Composition and Molluscicidal Activity of the Essential Oil from the Stem Bark of Ocotea bracteosa (Meisn.) Mez
Denise F. Coutinho,Celidarque da Silva Dias,José Maria Barbosa-Filho,Maria de Fátima Agra,Rodrigo M. Martins,Tania M. S. Silva,Emídio V. L. da-Cunha,Marcelo Sobral da Silva,Afrânio Aragão Craveiro +8 more
TL;DR: The volatile oil of Ocotea bracteosa stem bark showed significant molluscicidal activity against Biomphalaria glabrata, with an LC90 value of 8.3 μg/ mL, which falls below the threshold of 100 μg/mL, set by the World Health Organization.
References
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A seasonal census of phenolics, fibre and alkaloids in foliage of forest trees in Costa Rica: some factors influencing their distribution and relation to host selection by Sphingidae and Saturniidae
TL;DR: The foliage of 80 species common in the Santa Rosa National Park, Costa Rica, has been analysed for content of total phenolics, condensed tannins, acid detergent fibre and water and it was observed that alkaloids were much more common than phenolics in the foliage of deciduous species.
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Absolute configuration of the benzofuranoid neolignans
Otto R. Gottlieb,Jamil C. Mourão,Mamayoshi Yoshida,Yvonne Primerano Mascarenhas,Mabel de M. Rodrigues,Robert D. Rosenstein,Koychi Tomita +6 more
TL;DR: The benzofuranoid neolignans, classified into structurally homogeneous groups by constitution and ORD curves, have had their relative configurations have been discussed in this paper, where they have been classified into several groups.
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Oxidative coupling of bromo- and iodo-ferulic acid derivatives: synthesis of (±)-veraguensin
TL;DR: In this paper, the phenolic coupling of halogen-containing ferulic acid and methyl ester derivatives was examined with particular reference to the synthesis of lignans of the aryltetralin and tetrahydrofuran classes.
Journal ArticleDOI
Neolignans from Aniba terminalis
TL;DR: A benzene extract of the trunk wood of Aniba terminalis (Lauraceae) contained besides benzyl benzoate, benzyl salicylate, d,1-camphor and sitosterol, which may be responsible, through sequential rearrangements of the Cope, retro-Claisen and Claisen types, and finally dehydrogenation, for the formation of the cooccurring (2S,3S,5S)- and (2R,3s,5R)-5-allyl-5-methoxy-3-methyl
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Neolignans from a Nectandra species
TL;DR: The trunk wood of an Amazonian Nectandra (Lauraceae) species contains one bicyclo[3.2.1]octanoid and four hydrobenzofuranoid neolignans, a new representative of the seemingly rare macrophyllin type.