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1.
  • Nkengfack, Augustin E, et al. (author)
  • Prenylated isoflavanone from the roots of Erythrina sigmoidea
  • 1994
  • In: Phytochemistry. - 0031-9422. ; 36:4, s. 1047-1051
  • Journal article (peer-reviewed)abstract
    • A novel prenylated isoflavanone, sigmoidin I, has been isolated from the roots of Erythrina sigmoidea, in addition to the known isoflavones, corylin and neobavaisoflavone and the known pterocarpan, phaseollidin. Its structure was established as 7,4'-dihydroxy-3'-methoxy-5'-(3-methylbut-2-enyl) isoflavanone by means of spectroscopic analyses and chemical transformations. Neobavaisoflavone displayed antifungal potency in vitro with minimum inhibitory concentrations against Aspergillus fumigatus and Cryptococcus neoformans, of 50 mg ml-1.
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2.
  • Nkengfack, Augustine E, et al. (author)
  • Sigmoidins J and K, two new prenylated isoflavonoids from Erythrina sigmoidea
  • 1994
  • In: Journal of Natural Products. - : American Chemical Society (ACS). - 0163-3864 .- 1520-6025. ; 57:8, s. 1172-1177
  • Journal article (peer-reviewed)abstract
    • In addition to the two known compounds neotautenol [2] and erythrinassinate B [4], two new compounds, an isoflavanone named sigmoidin J [1] and a coumestan derivative named sigmoidin K [3], have been isolated and characterized from the root bark of the Cameroonian medicinal plant Erythrina sigmoidea. Their structures have been established as 7, 4'-dihydroxy-2',5'-dimethoxy-6'(gamma, gamma-dimethylally)isoflavanone [1] and 3,9-dihydroxy-2,10-(gamma, gamma dimethylallyl) coumestan [3], respectively, by spectroscopic techniques and from chemical evidence.
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