title: Chalcones and other constituents of Dorstenia prorepens and Dorstenia zenkeri.
abstract: The twigs of Dorstenia prorepens furnished the digeranylated chalcone, 5,3'-(3,7-dimethyl-2,6-octadienyl)-3,4, 2',4'-tetrahydroxychalcone while Dorstenia zenkeri yielded the 3',4'-(3-hydroxy-2,2-dimethyldihydropyrano)-4,2'-dihydroxychalcone and a bichalcone. 4-Hydroxylonchocarpin was found in both plants. D. prorepens also yielded the known compounds: psoralen, bergapten, beta-sitosterol and its D-glucopyranosyl derivative. D. zenkeri yielded p-hydroxybenzaldehyde, dorsmanin A, 4,2',4'-trihydroxychalcone and 4,2',4'-trihydroxy-3'-prenylchalcone. Structures of the new compounds were established by UV, IR, MS and 2-D NMR analysis.
authors.affiliation: Department of Chemistry, University of Botswana, P. Bag 0022, Gaborone, Botswana. abegazb@mopipi.ub.bw
authors.forename: Berhanu M
authors.initials: BM
authors.lastname: Abegaz
authors.forename: Bonaventure T
authors.initials: BT
authors.lastname: Ngadjui
authors.forename: Etienne
authors.initials: E
authors.lastname: Dongo
authors.forename: Bathelemy
authors.initials: B
authors.lastname: Ngameni
authors.forename: Mathew N
authors.initials: MN
authors.lastname: Nindi
authors.forename: Merhatibeb
authors.initials: M
authors.lastname: Bezabih
mesh_terms: D000078223:5-Methoxypsoralen; D001547:Benzaldehydes / Q000302:isolation & purification; D002599:Chalcone / Q000031:analogs & derivatives / Q000737:chemistry* / Q000302:isolation & purification; D005363:Ficusin / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008730:Methoxsalen / Q000031:analogs & derivatives* / Q000302:isolation & purification; D008968:Molecular Conformation; D029586:Moraceae / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry
chemical_list: D001547:Benzaldehydes; D000078223:5-Methoxypsoralen; D002599:Chalcone; D005363:Ficusin; C011483:4-hydroxybenzaldehyde; D008730:Methoxsalen