Lakshminine, a New Rare Oxoisoaporphine Alkaloid from Sciadotenia toxifera, and Structural Revisions of Telazoline and Teladiazoline, Two Related Oxoaporphines from Telitoxicum peruvianum and T. glaziovii

Lakshminine (<BO>1</BO>), a novel oxoisoaporphine alkaloid possessing a C-6 amine substituent, was isolated from a basic fraction from the woody vines (collected from two bush-ropes) of Sciadotenia toxifera. This compound represents the first documented occurrence of an oxoisoaporphine from any Menispermaceae species other than Menispermum dauricum. The structures of two related aporphine alkaloids, telazoline (<BO>3</BO>) and teladiazoline (<BO>5</BO>), were revised on the basis of a comparison of their spectral data with that of lakshminine (<BO>1</BO>).