Trypanocidal activity of coumarins and styryl-2-pyrones from Polygala sabulosa A.W. Bennett (Polygalaceae)
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چکیده
منابع مشابه
Polygala Minima (polygalaceae) in Western Mexico
The widespread Neotropical species Polygala glochidiata has traditionally been considered the only Polygala with uncinate seed hairs to occur in Mexico. A second species with such hairs is shown to occur partly sympatrically with P. glochidiata in Jalisco and Nayarit and is referred to P. minima, heretofore considered to be a species restricted to southern Brazil, Paraguay, and northern Argenti...
متن کاملConvenient synthesis of 3-vinyl and 3-styryl coumarins.
A variety of 2-hydroxy aldehydes on reaction with 3-butenoic acid afford in a one-pot reaction the corresponding 3-vinylcoumarins. As expected, extension of the delocalized π-electron system accomplished by Heck coupling reactions with aryl halides results in an increased fluorescence of the compounds whose applicability is yet to be established.
متن کاملPollen viability of Polygala paniculata L. (Polygalaceae) using different staining methods.
Polygala paniculata L. is a medicinal plant that grows in the Brazilian Atlantic coast, known as 'barba-de-São-João', 'barba-de-bode', 'vassourinha branca', and 'mimosa'. In this study, pollen viability was estimated by three different staining methods: 2% acetic orcein, 2% acetic carmine, and Alexander's stain. The young inflorescences of twenty accessions were collected and fixed in a solutio...
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Calophyllum brasiliense and Mammea americana (Clusiaceae) are two trees from the tropical rain forests of the American continent. A previous screening showed high trypanocidal activity in the extracts of these species. Several mammea-type coumarins, triterpenoids and biflavonoids were isolated from the leaves of C. brasiliense. Mammea A/AA was obtained from the fruit peels of M. americana. Thes...
متن کاملDiversity-oriented general protocol for the synthesis of privileged oxygen scaffolds: pyrones, coumarins, benzocoumarins and naphthocoumarins.
A new general methodology for the synthesis of various functionalized privileged oxygen heterocyclic scaffolds, viz. pyrones, coumarins, and benzannulated coumarins, is developed. The synthesis proceeds through carbanion-induced ring transformation of lactones with various methylene carbonyl compounds followed by DDQ-mediated unprecedented oxidative cleavage of oxaylidenes intermediates. Studie...
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ژورنال
عنوان ژورنال: Revista Brasileira de Farmacognosia
سال: 2008
ISSN: 0102-695X
DOI: 10.1590/s0102-695x2008000200006