Prenylated and geranylated chalcones and flavones from the aerial parts of Dorstenia ciliata

  • Bonaventure T. Ngadjui Department of Organic Chemistry, University of Yaounde-1, BP 812, Yaounde, Cameroon
  • Bathelemy Ngameni Department of Organic Chemistry, University of Yaounde-1, BP 812, Yaounde, Cameroon
  • Etienne Dongo Department of Organic Chemistry, University of Yaounde-1, BP 812, Yaounde, Cameroon
  • Simeon F. Kouam Department of Chemistry, Higher Teachers' Training School BP 47, Yaounde, Cameroon
  • Berhanu M. Abegaz Department of Chemistry, University of Botswana, Private Bag 0022, Gaborone, Botswana

Abstract

Investigation of the aerial parts of Dorstenia ciliata yielded two new prenylated flavones named ciliatins A and B and characterized as 6,7-(2''-isopropenyldihydrofurano)-5,4'-dihydroxyflavone and 6,5-(2,2-dimethyldihydropyrano)-7,4'-dihydroxy-3'-methoxyflavone, respectively. Known flavonoids: stipulin, isobavachalcone, licoflavone C, 6-prenylapigenin, dinklagin C, gancaonin P, canniflavone and poinsettifolin A were also identified. Structures of these secondary metabolites were established on the basis of spectroscopic analysis, comparison with published information and with authentic specimen for some cases and chemical evidence for the dihydropyranoflavone derivative.

(Bulletin of The Chemical Society of Ethiopia: 2002 16 (2): 157-164)
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Articles

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eISSN: 1726-801X
print ISSN: 1011-3924