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-α,β-unsaturated γ-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.