c © TÜBİTAK 6-O-α-L-Rhamnopyranosylcatalpol Derivative Iridoids from Verbascum cilicicum

From the aerial parts of Verbascum cilicicum Boiss., 6 iridoid glycosides, namely catalpol (1), ver-baspinoside [ = 6-O-(2′′-O-trans-cinnamoyl)-α-L-rhamnopyranosylcatalpol] (2), 6-O-(3′′-O-trans-cinna-moyl)-α-L-rhamnopyranosylcatalpol (3), 6-O-(4′′-O-trans-cinnamoyl)-α-L-rhamnopyranosylcatalpol (4), saccatoside [ = 6-O-(2′′-O-trans-p-coumaroyl)-α-L-rhamnopyranosylcatalpol] (5), and 6-O-(3′′-O-trans-p-coumaroyl)-α-L-rhamnopyranosylcatalpol (6), were isolated. The structures of the compounds were elucidated by means of 1 and 2 dimensional (DQF-COSY, HMQC and HMBC) NMR techniques and LC-ESIMS