Eudesmanes from Pluchea sagittalis. Their antifeedant activity on Spodoptera frugiperda.
Phytochemistry
; 69(8): 1689-94, 2008 May.
Article
em En
| MEDLINE
| ID: mdl-18420237
Eudesmane-type sesquiterpenoids 3alpha-(2,3-epoxy-2-methylbutyryloxy)-4alpha-formoxy-11-hydroxy-6,7-dehydroeudesman-8-one (1) and 3alpha-(2,3-epoxy-2-methylbutyryloxy)-4alpha,7alpha,11-trihydroxyeudesman-8-one (2), together with 10 known structurally related eudesmanes were isolated from the CHCl3 extract of aerial parts of Pluchea sagittalis (Lamarck) Cabrera. Their structures were deduced by extensive application of 1 and 2D NMR spectroscopic techniques and high and low resolution CIMS. X-ray crystallographic analysis of the known compound 3alpha-(2,3-epoxy-2-methylbutyryloxy)-4alpha-formoxycuauthemone (9) is reported here for the first time, and confirms the structural features for the series of the reported eudesmanes. All eudesmanes were tested for their antifeedant activity by incorporating them to an artificial diet of larvae of the polyphagous insect Spodoptera frugiperda at a concentration of 100ppm. Our results, from feeding choice tests, indicated that most of the compounds deter larval feeding at the cited concentration.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sesquiterpenos
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Spodoptera
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Asteraceae
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Preparações de Plantas
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Sesquiterpenos de Eudesmano
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Comportamento Alimentar
Limite:
Animals
Idioma:
En
Revista:
Phytochemistry
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Argentina
País de publicação:
Reino Unido