Isolation and characterization of two new alkaloids, norpandamarilactonine-A and -B, from Pandanus amaryllifolius by spectroscopic and synthetic methods.

Two new alkaloids, norpandamarilactonine-A (1) and -B (2), which have a pyrrolidinyl-alpha,beta-unsaturated gamma-lactone moiety as in the known pandamarilactonine alkaloids, were isolated from the leaves of Pandanus amaryllifolius. Their structures were determined by spectroscopic analysis and total synthesis.

Glucoindole alkaloids from Ophiorrhiza acuminata.

Extraction of Ophiorrhiza acuminata L. leaves has yielded harman, lyalosidic acid, and palicoside whose structures were verified by 2D-NMR spectroscopy and by comparison with literature data.