An unusual oxindole alkaloid inner salt, macrophyllionium (1), and a pair of new tetracyclic oxindole alkaloids,
macrophyllines A (2) and B (3), together with six known alkaloids, were isolated from the aerial parts of Uncaria
macrophylla. Corynantheidine (8) exhibited moderate cytotoxicity against HL-60 and SW480 cells with IC50 values of
13.96 and 23.28 µM, respectively. Dihydrocorynantheine (9) exhibited significant vasodilating activity against
phenylephrine-induced contraction in rat thoracic aorta rings (IC50 ) 6.73 µg/mL). In addition, compounds 2, 6, and 9
showed weak inhibitory action on KCl-induced contraction.
An unusual oxindole alkaloid inner salt, macrophyllionium (1), and a pair of new tetracyclic oxindole alkaloids,macrophyllines A (2) and B (3), together with six known alkaloids, were isolated from the aerial parts of Uncariamacrophylla. Corynantheidine (8) exhibited moderate cytotoxicity against HL-60 and SW480 cells with IC50 values of13.96 and 23.28 µM, respectively. Dihydrocorynantheine (9) exhibited significant vasodilating activity againstphenylephrine-induced contraction in rat thoracic aorta rings (IC50 ) 6.73 µg/mL). In addition, compounds 2, 6, and 9showed weak inhibitory action on KCl-induced contraction.
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