Flavonol glycosides from the leaves of Astragalus microcephalus

摘要

Four new flavonol glycosides were isolated from the leaves of Astragalus microcephalus. The structures of the new compounds were established as Isorhamnetin-3-O- [β-D-apiofuranosyl (1→3)]-β-D-glucopyranoside (Microcephalin I), Isorhamnetin-3-O- [α-L-rhamnopyranosyl (1→3)]-β-D-glucopyranoside (Microcephalin II), Their strucrures were totally elucidated based on spectroscopic methods, 1D- (1H, 13C, 13C DEPT) and 2D- NMR experiments as well as UV spectra analysis