Chemical Studies on the Oriental Plant Drugs. XXXI. Sapogenins of the Roots of Platycodon grandiflorum A. DE CANDOLLE. (2). Structure of Platycodigenin

Abstract

The structure of platycodigenin, a spogenin of the saponin of the root of Platycodon grandiflorum A. DC. has been shown to be 2β, 3β, 16α, 23, 24-pentahydroxyolean-12-en-28-oic acid (I) by the nuclear magnetic resonance and mass spectral analyses of platycodigenin and its derivatives. The bromolactone (IX) of I was prepared to determine the absolute structure by the X-ray crystallographic analysis.