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Turkish Journal of Chemistry, Vol.27, No.6, 765-772, 2003
6-O-alpha-L-rhamnopyranosylcatalpol derivative iridoids from Verbascum cilicicum
From the aerial parts of Verbascum cilicicum Boiss., 6 iridoid glycosides, namely catalpol (1), verbaspinoside [=6-O-(2"-O-trans-cinnamoyl)-alpha-L-rhamnopyranosylcatalpol] (2), 6-O-(3"-O-trans-cinnamoyl)-alpha-L-rhamnopyranosylcatalpol (3), 6-O-(4"-O-trans-cinnamoyl)-alpha-L-rhamnopyranosylcatalpol (4), saccatoside [=6-O-(2"-O-trans-p-coumaroyl)-alpha-L-rhamnopyranosylcatalpol] (5), and 6-O-(3"-O-trans-p-coumaroyl)-alpha-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.
Keywords:Verbascum cilicicum;Scrophulariaceae;iridoid glycosides;catalpol (1);verbaspinoside (2);6-O-(3 ''-O-trans-cinnamoyl)-alpha-L-rhamnopyranosylcatalpol (3);6-O-(4 ''-O-trans-cinnamoyl)-alpha-L-rhamnopyranosylcatalpol (4);saccatoside (5);6-O-(3 ''-O-trans-p-coumaroyl)-alpha-L-rhamnopyranosyleatalpol (6)