Synthesis of Novel Mammalian Metabolites of the Isoflavonoid Phytoestrogens Daidzein and Genistein

The synthesis of novel mammalian metabolites of dietary isoflavones, dihydrodaidzein (4',7-dihydroxyisoflavanone) 7, dihydrogenistein (4',5,7-trihydroxyisoflavanone) 9, 6'-hydroxy-O-demethylangolensin [1-(2,4,6-trihydroxyphenyl)-2-(4-hydroxyphenyl)propan-1-one] 10, and cis- and trans-4',7-dihydroxyisoflavan-4-ols 11, 12 is described, and their characteristics by physical and chemical constants given for the first time.