Studies on the constituents of cistanchis herba. III. Isolation and structures of new phenylpropanoid glycosides, cistanosides A and B.

Abstract

Two new phenylpropanoid glycosides, named cistanoside A (III) and cistanoside B (IV), were isolated from the whole plant of Cistanche salsa (C. A. MEY.) G. BECK (Orobanchaceae), together with acteoside (I) and echinacoside (II). The structures of III and IV were determined to be 2-(4-hydroxy-3-methoxyphenyl) ethyl O-α-L-rhamnopyranosyl-(1→3)-O-[β-D-glucopyranosyl-(1→6)]-(4-O-caffeoyl)-β-D-glucopyranoside and 2-(4-hydroxy-3-methoxyphenyl) ethyl O-α-L-rhamnopyranosyl-(1→3)-O-[β-D-glucopyranosyl-(1→6)]-(4-O-feruloyl)-β-D-glucopyranoside, respectively, on the basis of chemical and spectral data.