Chromenes
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. New α-Hydroxy-1,2,3-triazoles and 9H-Fluorenes-1,2,3-triazoles: Synthesis and Evaluation as Glycine Transporter 1 Inhibitors
Two series of new compounds containing 1,2,3-triazole moiety were designed as putative GlyT1 inhibitors aiming the discovery of new hits with activity in cognitive disorders. 1,4-Disubstituted α-hydroxy-1,2,3-triazoles were obtained as racemates in moderate to good yields by the copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction (click chemistry)
J. Braz. Chem. Soc.. Publicado em: 2020-06
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2. “Arnicas” from Brazil: comparative analysis among ten species
Abstract The “arnicas” found in Brazil are examples of different species of the family Asteraceae used in popular medicine for its attributed anti-inflammatory action. Among the species known and used as “arnica” we selected: Calea uniflora Less., Chaptalia nutans (L.) Polák, Lychnophora ericoides Mart., Lychnophora pinaster Mart., Lychnophora salic
Rev. bras. farmacogn.. Publicado em: 17/10/2019
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3. The Role of L-Proline and Co-Catalysts in the Enantioselectivity of OXA-Michael-Henry Reactions
The use of L-proline derivatives employed in OXA-Michael-Henry tandem reactions has been an efficient method to produce enantiomerically enriched compounds. In this work it was carried out a study of the OXA-Michael-Henry reactions between salicylaldehyde and β-nitrostyrenes, catalyzed by L-proline and its derivatives. The corresponding (R)-3-nitro-2-phenyl
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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4. Biosynthetic Insights into p-Hydroxybenzoic Acid-Derived Benzopyrans in Piper gaudichaudianum
Piper gaudichaudianum Kunth (Piperaceae) accumulates gaudichaudianic acid, a prenylated benzopyran, as its major component. Interestingly, this trypanocidal compound occurs as a racemic mixture. Herein, transcriptomic investigations of Piper gaudichaudianum using the RNA-seq approach are reported, and from the analysis of the transcripts expressed it was pos
J. Braz. Chem. Soc.. Publicado em: 2018-05
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5. Chromenes from leaves of Calea pinnatifida and evaluation of their leishmanicidal activity
Calea pinnatifida (R. Br.) Less., Asteraceae, is popularly known as “quebra-tudo”, “cipó-cruz” or “aruca”. This species is used in the folk medicine for the treatment of stomach pain, giardiasis and amoebiasis. The aim of this study was to isolate and identify chromenes from leaves of C. pinnatifida and evaluate their leishmanicidal activity. A
Rev. bras. farmacogn.. Publicado em: 2015-02
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6. Pyrrolizidine alkaloids in medicinal tea of Ageratum conyzoides
It is now widely-recognized that the view that herbal remedies have no adverse effects and/or toxicity is incorrect; some traditionally-used plants can present toxicity. The well-established popular use of Ageratum conyzoides has led to its inclusion in a category of medicinal crude drugs created by the Brazilian Health Surveillance Agency. Ageratum belongs
Rev. bras. farmacogn.. Publicado em: 26/03/2013
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7. Otimização das condições de cultivo de Beauveria bassiana e Mycoleptodiscus indicus visando à produção de metabólitos com atividades antimicrobiana, antiparasitária e antitumoral / Optimization of culture conditions of Beauveria bassiana and Mycoleptodiscus indicus aiming the production of metabolites with antimicrobial, antitumor and antiparasitic activity
Sabe-se que micro-organismos são vistos como promissoras fontes de moléculas bioativas, incluindo-se nesse grupo fungos endofíticos e também entomopatogênicos. Desse modo, foram selecionados o fungo entompatogênico Beauveria bassiana e o fungo endofítico Mycoleptodiscus indicus. Numa primeira etapa foram prospectadas condições de cultivo favoráveis
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/03/2012
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8. Bioprospecting of Piperaceae species / Bioprospecção em espécies de Piperaceae
The present study was addressed to evaluate the antifungal activity of crude extracts from Piperaceae species in which different parts of the plant (leaves, stems and roots) were assessed by means of bioautography against Cladosporium cladosporioides and Cladosporium sphaerospermum. After antifungal assay, the extratcs from Piper mollicomum, Piper marginatum
Publicado em: 2009
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9. Antifungal derivatives from Piper mollicomum and P. lhotzkyanum (Piperaceae)
Bioguided fractionation of the extracts from leaves of Piper mollicomum and Piper lhotzkyanum against the fungi Cladosporium cladosporioides and C. sphaerospermum afforded seven bioactive compounds, four being chromenes: methyl 2,2-dimethyl-2H-chromene-6-carboxylate, methyl 8-hydroxy-2,2-dimethyl-2H-chromene-6-carboxylate, 2-methyl-2-[4'-methyl-3'-pentenyl]-
Química Nova. Publicado em: 2007-10
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10. Studies toward the synthesis of jungianol and construction of benzofurans by TTN-mediated ring contraction / Estudos visando à síntese do jungianol e a construção de anéis benzofurânicos utilizando TTN
This thesis describes the studies aiming at the synthesis of jungianol and the construction of benzofuranic rings. In both cases, the key-step is the reaction of thallium(III)-mediated ring contraction. Jungianol is a phenolic sesquiterpene isolated by Bohlmann et al., in 1977, from the species Jungia malvaefolia. The key-step of the synthesis could be the r
Publicado em: 2007
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11. Biosynthetic origin of the isoprene units in chromenes of Piper aduncum (Piperaceae)
Estudos metabólicos envolvendo a incorporação de D-glicose-[1-13C] em folhas de Piper aduncum (Piperaceae) mostraram que as vias do mevalonato (MVA) e da triose-piruvato (MEP) estão envolvidas na biossíntese da unidade isoprênica presente no 2,2-dimetil-2H-1-cromeno-6-carboxilato de metila (1) e no 2,2-dimetil-8-(3'-metil-2'-butenil)-2H-1-cromeno-6-car
Journal of the Brazilian Chemical Society. Publicado em: 2007
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12. Survey of microbial oxygenases: trichloroethylene degradation by propane-oxidizing bacteria.
Microorganisms that biosynthesize broad-specificity oxygenases to initiate metabolism of linear and branched-chain alkanes, nitroalkanes, cyclic ketones, alkenoic acids, and chromenes were surveyed for the ability to biodegrade trichloroethylene (TCE). The results indicated that TCE oxidation is not a common property of broad-specificity microbial oxygenases