Journal ArticleDOI
Benzoic Acid Derivatives from Piper Species and Their Fungitoxic Activity against Cladosporium cladosporioides and C. sphaerospermum
João Henrique G. Lago,Clécio Sousa Ramos,Diego Campos C. Casanova,Andreia de A. Morandim,Debora Cristina B. Bergamo,Alberto José Cavalheiro,Vanderlan da Silva Bolzani,Maysa Furlan,Elsie F. Guimarães,Maria Claudia Marx Young,Massuo J. Kato +10 more
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Piper crassinervium, P. aduncum,P.Abstract:
Piper crassinervium, P aduncum, P hostmannianum, and P gaudichaudianum contain the new benzoic acid derivatives crassinervic acid (1), aduncumene (8), hostmaniane (18), and gaudichaudianic acid (20), respectively, as major secondary metabolites Additionally, 19 known compounds such as benzoic acids, chromenes, and flavonoids were isolated and identified The antifungal activity of these compounds was evaluated by bioautographic TLC assay against Cladosporium cladosporioides and C sphaerospermumread more
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Natural and synthetic chromenes, fused chromenes, and versatility of dihydrobenzo[h]chromenes in organic synthesis.
Ramendra Pratap,Vishnu Ji Ram +1 more
Journal ArticleDOI
Metalloradical Approach to 2H-Chromenes
TL;DR: DFT calculations reveal the formation of the salicyl-vinyl radical intermediate by a metalloradical-mediated process, which dissociates spontaneously from the cobalt center and easily undergoes an endocyclic, sigmatropic ring-closing reaction to form the final 2H-chromene product.
Journal ArticleDOI
Syntheses of chromenes and chromanes via o-quinone methide intermediates
Sabrina Baptista Ferreira,Fernando de C. da Silva,Fernando de C. da Silva,Angelo C. Pinto,Daniel T. G. Gonzaga,Vitor F. Ferreira +5 more
TL;DR: This review intends to explore synthetic methodologies for the preparation of 2H-chromenes and their analog chromanes through ortho-quinone methide (o-QM) intermediates associated with inter and intramolecular hetero-Diels-Alder and electrocyclization reactions.
Journal ArticleDOI
Iron-Catalyzed Synthesis of Functionalized 2H-Chromenes via Intramolecular Alkyne−Carbonyl Metathesis
TL;DR: An iron-catalyzed intramolecular alkyne-aldehyde metathesis strategy of the alkynyl ether of salicylaldehyde derivatives has been developed which works under mild reaction conditions to produce the functionalized 2H-chromene derivatives.
Journal ArticleDOI
Activity-guided isolation of antiplasmodial dihydrochalcones and flavanones from Piper hostmannianum var. berbicense
Bénédicte Portet,Nicolas Fabre,Vincent Roumy,Heinz Gornitzka,Geneviève Bourdy,Séverine Chevalley,Michel Sauvain,Alexis Valentin,Claude Moulis +8 more
TL;DR: The bioassay-guided purification of an n-hexane extract from the leaves of Piper hostmannianum var.
References
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Book
The Flavonoids: Advances in Research
Jeffrey B. Harborne,T. J. Mabry +1 more
TL;DR: In this paper, carbon-13 NMR Spectroscopy of Flavonoids was used for isolation techniques for the extraction of Flavone and Flavonol Glycosides, respectively.
Journal ArticleDOI
The Flavonoids: Advances in Research : Edited by J.B. Harborne and T.J. Mabry Chapman and Hall; London, New York, 1982 744 pages. £ 49.50
Journal Article
Carbon-13 NMR of flavonoids
TL;DR: Agrawal et al. as mentioned in this paper proposed a method for signal assignment of carbon-13 NMR spectroscopy images of the flavonoid structures and established the aromatic substitution pattern.
Journal ArticleDOI
Phytochemistry of the genus Piper
Virinder S. Parmar,Subhash C. Jain,Kirpal S. Bisht,Rajni Jain,Poonam Taneja,Amitabh Jha,O. D. Tyagi,Ashok K. Prasad,Jesper Wengel,Carl Erik Olsen,Per M. Boll,Per M. Boll +11 more
TL;DR: The secondary metabolites isolated from Piper species for the period 1907 to June 1996 have been reviewed in this paper, where nearly six hundred chemical constituents belonging to different classes of bioactive compounds are listed together with their source(s) and references.
Journal ArticleDOI
Direct bioautography on thin-layer chromatograms as a method for detecting fungitoxic substances
A.L. Homans,A. Fuchs +1 more
TL;DR: Chromatography permits not only the detection of fungitoxic substances per se, but also makes the study of the conversion reactions and of decomposition of such compounds possible.