10-hydroxydarlingine, a new tropane alkaloid from the Australian proteaceous plant Triunia erythrocarpa

Triunia erythrocarpa was identified as containing alkaloids during chemical screening of Queensland Proteaceae using Dragendorff's reagent. A new trop ane, 10-hydroxydarlingine (1), and the known tropane, darlingine (2), were isolated from the leaves of T. erythrocarpa. The absolute stereochemistry o f 10-hydroxydarlingine (1) was assigned using the advanced Mosher method. T . erythrocarpa is only the seventh member of the Proteaceae to have been sh own to produce alkaloids.