Structures and Solid State Tautomeric Forms of Two Novel Antileukemic Tropoloisoquinoline Alkaloids, Pareirubrines A and B, from Cissampelos pareira

Abstract

Two novel tropoloisoquinoline alkaloids, Pareirubrines A and B, have been isolated as antileukemic substances from Cissampelos pareira (Menispermaceae), together with the same skeleton alkaloids, grandirubrine and isoimerubrine. Their structures were elucidated by nuclear magnetic resonance (NMR) studies, and their solid state tautomeric forms were examined by X-ray crystallographic analysis. © 1993, The Pharmaceutical Society of Japan. All rights reserved.