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-trihydroxy-isoflavanone) 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.