Two New Iridoid Glucosides From Verbascum Salviifolium Boiss.

Abstract

From the aerial parts of the plant Verbascum salviifolium, two new iridoid glucosides, 6-O-beta-D-glucopyranosylcatalpol (1) and 6-O-(6"-O-trans-p-hydroxycinnamoyl)-beta-D-glucopyranosylaucubin (2) along with five known iridoid glycosides, 6-0-beta-D-glucopyranosylaucubin (3), 6-O-alpha-L-rhamnopyranosylcatalpol (4), verbaspinoside [=6-O-(2"-O-trans-cinnamoyl)-alpha-L-rhamnopyranosylcatalpol] (5), pulverulentoside I [=6-0-(2"-O-trans-p-methoxycinnamoyl-3"-O-acetyl)-alpha-L-rhamnopyranosylcatalpol] (6), and buddlejoside A(8) [=6-O-(4"-O-trans-3,4-dimethoxycinnamoyl)alpha-L-rhamnopyranosylcatalpol] (7) were isolated. The structures of the new compounds were established on the basis of spectroscopic evidence.