0000000000303320

AUTHOR

K. Sundar Rao

showing 3 related works from this author

Prenylated benzopyran derivatives from two Polyalthia species

1996

Two new benzopyran derivatives, (6E,10E)-isopolycerasoidol and polycerasoidin methyl ester, have been isolated from a methanolic extract of the stem bark of Polyalthia cerasoides. Their structures were established on the basis of chemical and spectral evidence. Polyalthia sclerophylla contains (6E,10E)-isopolycerasoidol, besides the known polycerasoidin and polycerasoidol. In addition, a known phenylpropene derivative, trans-asarone, has also been isolated from both species and fully characterized.

biologyPolyalthia sclerophyllaStereochemistryPolyalthiaPlant ScienceGeneral MedicineHorticulturebiology.organism_classificationBiochemistryBenzopyranchemistry.chemical_compoundchemistryPrenylationAnnonaceaevisual_artvisual_art.visual_art_mediumOrganic chemistryPolyalthia cerasoidesBarkPhenylpropeneMolecular BiologyPhytochemistry
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Styryl-pyrones from Goniothalamus arvensis

1998

Two novel styrl-pyrones, (+)-garvensintriol and (+)-etharvendiol, together with a known cytotoxic furano-furone, (+)-goniofufurone, have been isolated from the stem bark of Goniothalamus arvensis. A different relative configuration, cis-erythro-erythro for garvensintriol and cis-threo-erythro for etharvendiol, is established, and their absolute stereochemistry is discussed.

Models MolecularStem barkMagnetic Resonance SpectroscopyEtharvendiolMolecular StructurebiologyStereochemistryChemistryGarvensintriolPlant ScienceGeneral MedicinePlantsHorticulturebiology.organism_classificationBiochemistryMass SpectrometryPyronesAnnonaceaevisual_artvisual_art.visual_art_mediumBarkMolecular BiologyGoniothalamusPhytochemistry
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Styryl-lactones from the stem bark of Goniothalamus arvensis

1999

The fractionation of the methanolic extract of Goniothalamus arvensis (Annonaceae) stem bark led to the isolation of two novel styryl-lactones, arvensin and (+)-2-epi-altholactone. The structures of these compounds, which belong to the furano-pyrone group, were established on the basis of mass spectrometry, one- and two-dimensional nuclear magnetic resonance experiments, as well as simple chemical derivatization. The relative and absolute configurations of the compounds are discussed. Copyright © 1999 John Wiley & Sons, Ltd.

Stem barkbiologyStereochemistryPlant ScienceGeneral MedicineFractionationbiology.organism_classificationMass spectrometryBiochemistryAnalytical Chemistrychemistry.chemical_compoundComplementary and alternative medicinechemistryAnnonaceaeDrug DiscoveryMolecular MedicineDerivatizationGoniothalamusFood SciencePhytochemical Analysis
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