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Diprenylated chalcones and other constituents from the twigs of Dorstenia barteri var. subtriangularis.

Authors :
Ngameni B
Ngadjui BT
Folefoc GN
Watchueng J
Abegaz BM
Source :
Phytochemistry [Phytochemistry] 2004 Feb; Vol. 65 (4), pp. 427-32.
Publication Year :
2004

Abstract

The twigs of Dorstenia barteri var. subtriangularis yielded three diprenylated chalcones: (-)-3-(3,3-dimethylallyl)-5'-(2-hydroxy-3-methylbut-3-enyl)-4,2',4'-trihydroxychalcone, (+)-3-(3,3-dimethylallyl)-4',5'-[2'''-(1-hydroxy-1-methylethyl)-dihydrofurano]-4,2'-dihydroxychalcone and 3,4-(6",6"-dimethyldihydropyrano)-4',5'-[2''',-(1-hydroxy-1-methylethyl)-dihydrofurano]-2'-hydroxychalcone for which the names bartericins A, B and C, respectively, are proposed. Stipulin, beta-sitosterol and its 3-beta-D-glucopyranosyl derivative were also isolated. The structures of these secondary metabolites were determined on the basis of spectroscopic analysis, especially, NMR spectra in conjunction with 2D experiments, COSY, HMQC and HMBC. The structural relationship of bartericins B and C was further established by the chemical cyclization of one to the other.

Details

Language :
English
ISSN :
0031-9422
Volume :
65
Issue :
4
Database :
MEDLINE
Journal :
Phytochemistry
Publication Type :
Academic Journal
Accession number :
14759536
Full Text :
https://doi.org/10.1016/j.phytochem.2003.10.021