Abstract
Phytochemical investigation on the stems of Tripterygium regelii resulted in the isolation of fourteen compounds, including six flavonoids (1–6), seven lignans (7–13), and one cyanogenic glycoside (14). This is the first report of the four dimeric flavonoids bis-8, 8′-catechinylmethane (2), bis (8-epicatechinyl) methane (3), bis-6, 8′-catechinylmethane (4) and montahomobisflavan B (5) from a species of Tripterygium. Previously, these dimeric flavonoids have been mainly identified from species of gymnosperms. This research has shown that the main secondary metabolisms identified in T. regelii were flavonoids and lignans. These data enable this species to be differentiated from T. wilfordii and T. hypoglaucum that contain the triptolide-resembling diterpenoids.
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