Distemonanthus

Only two compounds are listed here, in which a flavonol molecule is linked to a biosynthe-tically different product such as a terpenoid (denticulaflavonol Figure 12.9) and a flavonol-lignoid structure isolated from heartwood of Distemonanthus benthamianus (Fabaceae). In addition, the latter taxon accumidates derivatives with a 3-OH-2 -cyclization as mentioned before (see previous section). Earlier, similar substituted flavone-lignoid derivatives named scutellaprostins were reported from Scutellaria spp. (for references see Wollenweber ). 

Malan, E., A flavonol with a tetrasubstituted B-ring from Distemonanthus benthamianus. Phytochemistry, 32, 1631, 1993. 

Malan, E., Swinny, E., and Eerreira, D., A 3-oxygenated flavonolignoid from Distemonanthus... 

Happi, E.N. and Mpondo, T.N., Two polymethoxylated flavones from Distemonanthus bentha-mianus, J. Nat. Prod., 57, 291, 1994. 

Distemonanthus benthamianus (ayan) (Fabaceae), fea mays (Poaceae)... 

C29H280,2 M 568.533 Flavonolignan. Constit. of the heartwood of Distemonanthus benthamianus (Leguminosae). Amorph. powder (as tri-Ac). 

Distemonanthus benthiamusy Bail . Movingui, (ayan, Nigerian satinwood, if same as D. benthanianus) Oxyayanins A and B 10% Sawdust in pet. Cannot be told apart from Apuleia microscopically... 

Butea spp. (Leguminosae) Gleditsia spp. (Leguminosae) Millettia spp. (Leguminosae) Robinia spp. (Leguminosae) Distemonanthus benthamianus (Leguminosae)... 

From methyl 3,5,6,7,3, 4 -hexamethoxyflavone-2 -carboxylate (m.p. 151-152°) (SMI) with potassium hydroxide in refluxing dilute ethanol for 8 h (78%) [4844]. SMI was obtained by prolonged methylation of distemonanthin, itself isolated from the wood of distemonanthus benthamianus ... 

From 5,6-diethoxy-3,7,3, 4 -tetramethoxyflavone (SM). SM was prepared by ethylation of 5,6-dihydroxy-3,7,3, 4 -tetra-methoxyflavone (m.p. 211-213°), itself isolated from the heartwood of Distemonanthus berUhamiams Baillon [4928] ... 

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