Isolation and Structure Elucidation of Seco-neokadsuranic Acid A and 3,4-Seco-(24<i>Z</i>)-lanosta-4(30),8,24-triene-3,26-dioic Acid¹

Abstract

Seco-neokadsuranic acid A, the second natural triterpenoid with the unusual 14(13-->12) ABEO-lanostane skeleton was isolated from KADSURA HETEROCLITA together with 3,4-seco-(24 Z)-lanosta-4(30),8,24,triene-3,26-dioic acid. The present paper deals with the isolation and structure elucidation of these two new compounds and the preparation of two new 7-oxo-lanostane triterpenoid derivatives.