摘要
Two new benzopyran derivatives,1-[（rel 2S,3R）-3,5,7-trihydroxy-3,4-dihydro-2H-chromen-2-yl]ethanone（1）,and 1-[（rel 25,35）-3,5,7-trihydroxy-3,4-dihydro-2H-chromen-2-yl]ethanone（2）,along with four known flavonoids,prodelphinidin C,prodelphinidin B3,（-）-epi-gallocatechin and（＋）-gallocatechin,were isolated from the stems of Gouania leptostachya DC.var. tonkinensis Pitard.Their structures were determined on the basis of spectroscopic methods including HR-ESI-MS,1D and 2D NMR.Prodelphinidin C exhibited significant inhibitory activity forα-glucosidase.
Two new benzopyran derivatives,1-[（rel 2S,3R）-3,5,7-trihydroxy-3,4-dihydro-2H-chromen-2-yl]ethanone（1）,and 1-[（rel 25,35）-3,5,7-trihydroxy-3,4-dihydro-2H-chromen-2-yl]ethanone（2）,along with four known flavonoids,prodelphinidin C,prodelphinidin B3,（-）-epi-gallocatechin and（＋）-gallocatechin,were isolated from the stems of Gouania leptostachya DC.var. tonkinensis Pitard.Their structures were determined on the basis of spectroscopic methods including HR-ESI-MS,1D and 2D NMR.Prodelphinidin C exhibited significant inhibitory activity forα-glucosidase.
基金
the National Science & Technology Major Project "Key New Drug Creation and Manufacturing Program",China(No.2009ZX09301-001)
