センプリの成分研究(第6報) : ニイタカセンプリおよびシノノメソウのフラボノイドならびにキサントン成分について

抄録

The flavonoid and xanthone constituents of Swertia randaiensis HAYATA (1) and S. swertopsis MAKINO (2) were examined. A new xanthone O-glycoside, named norswer tianolin (VII), C₁₉H<18>O<11>, mp 265° (decomp.), was isolated from 1. The hydrolysis of VII with diluted acid produced desmethylbellidifolin (V) and glucose. The position of sugar bonding was proved to be on 1-position since, methylation of VII with diazome thane and subsequent hydrolysis afforded 1-hydroxy-3, 5, 8-trimethoxyxanthone. The structure of VII was therefore found to be desmethylbellidifolin-1-O-glucoside. From 2, norswertianin (I), swertianin (II), methylswertianin (III), decussatin (IV), methylbellidifolin (VI), isovitexin (IXa), homo-orientin (XIa), and mangiferin (XVa) were isolated and identified.