Diprenylated isoflavones

In our study of the species, the main phenolic compounds with prenyl group(s) were licoricidin (164,0.011%), licorisoflavan A (165,0.0025%) and glycyrol (169, 0.0023%). We also isolated twelve new isoprenoid-substituted phenols as minor constituents, kanzonols F-Q (178-189), from the underground parts (261, 284, 285). Kanzonols M (185), N (186), and O (187) are rare isoflavans with a formyl group on the A ring. The structures of the diprenylated isoflavones, kanzonols K (183) and L... 

Dihydroxy-2 -methoxy-6,3 -diprenyl-6",6"-dimetliylpyrano[2",3" 7,8]isoflavone Euchrenone bl3 502.60 C31H3406 F175... 

Almost half of the isoflavonoids identified from the Leguminosae, in which prenylated isoflavones constitute >50% of the total (pterocarpanoids, rotenoids, isoflavanones, isoflavans, coumestans, 3-arylcoumarins, and coumaronochromones), exhibit a high degree of structural diversity and complexity of prenylation.8,86"148 More than half of the isoflavones are monoprenylated, whereas 40% are diprenylated, and very few are triprenyl derivatives, with prenylation at positions 6>8>3 5 >6,>2 and O-methylation at 4 >7=6=2 =3 >5 =5>8. A number of novel isoflavonoid structures with rare skeletons, as well as complex isoflavone O- and C-glycosides have recently been reported.8,148... 

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