山楂叶中新黄酮化合物的分离与结构鉴定

Isolation and Structural Identification of the New Flavonoids from the Leaves of Crataegus pinnatifida Bge.var. major N.E.Br.

Two new flavonoids,namely pinnatifida A (1) and pinnatifida B (2),along with four known compounds,vitexin(3),6″ O acetyl vitexin(4),2″ O acetyl vitexin (5) and 2″ O rhamnosyl vitexin (6),were isolated from the leaves of Crataegus pinnatifida Bge.var. major N.E.Br.Their structures were elucidated by the spectroscopic analysis and chemical evidence.Compound (4) and (5) were first isolated from the leaves of Crataegus pinnatifida Beg.var. major N.E.Br.