Chalcones and other constituents of Dorstenia prorepens and Dorstenia zenkeri.

Autor: Abegaz BM; Department of Chemistry, University of Botswana, P. Bag 0022, Gaborone, Botswana. abegazb@mopipi.ub.bw, Ngadjui BT, Dongo E, Ngameni B, Nindi MN, Bezabih M
Jazyk: angličtina
Zdroj: Phytochemistry [Phytochemistry] 2002 Apr; Vol. 59 (8), pp. 877-83.
DOI: 10.1016/s0031-9422(01)00483-6
Abstrakt: 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.
Databáze: MEDLINE
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