Studies on the Constituents of Asclepiadaceae Plants. XLII. Component of Marsdenia tomentosa DECNE. Structure of 12β-O-Acetyltomentogenin and Hypothetical Biogenetic Pathway of Polyoxypregnanes in M. tomentosa

Abstract

A new polyoxypregnane derivative, 12β-O-acetyltomentogenin, was isolated from the stem of Marsdenia tomentosa. A hypothetical biogeneticf pathway of polyoxypregnane derivatives is proposed from their ester linkages.