Rare prenylated flavonoids from Tephrosia purpurea

Chemical investigations of aerial parts of Tephrosia purpurea yielded the rare prenylated flavonoids, tephropurpulin A (1) and isoglabratephrin (2), in addition to a previously identified flavonoid, glabratephrin (3). Structures were established by 1D and 2D NMR spectroscopy, as well as by HR-MS analysis: for compounds 2 and 3, structures were confirmed by X-ray analysis. (C) 2009 Elsevier Ltd. All rights reserved.