New Isoflavone C‐Glycosides from Pueraria lobata

Three new isoflavone C ‐glycosides, along with two known isoflavone O ‐glycosides, were isolated from the roots of Pueraria lobata ( Willd .) Ohwi . The structures of the new compounds were elucidated as 4′,7‐dihydroxy‐3′‐methoxyisoflavone 8‐ C ‐[ β ‐d‐ glucopyranosyl‐(1→6)]‐ β ‐d‐ glucopyranoside ( 1 ), 4′,7‐dihydroxy‐3′‐methoxyisoflavone 8‐ C ‐[ β ‐d‐ apiofuranosyl‐(1→6)]‐ β ‐d‐ glucopyranoside ( 2 ), and 8‐ C ‐ β ‐d‐ glucopyranosyl‐4′,7‐dihydroxy‐3′‐methoxyisoflavone 4′‐ O ‐ β ‐d‐ glucopyranoside ( 3 ) on the basis of spectroscopic methods, especially 2D‐NMR and MS analyses. The known compounds isolated were identified by comparison of their physical and spectroscopic data with those reported in the literature.