Isolation and structure elucidation of two new alkaloids, pandamarilactonine-C and -D, from Pandanus amaryllifolius and revision of relative stereochemistry of pandamarilactonine-A and -B by total synthesis.

Two new pyrrolidine alkaloids, pandamarilactonine-C and -D, were isolated from Pandanus amaryllifolius. Based on the total synthesis of pandamarilactonine-C and its related alkaloid, pandamarilactonine-A, the relative stereochemistry of pandamarilactonine-A and -B, which was previously proposed by spectroscopic analysis, was revised.