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A Guaianolide Sesquiterpene, a Chromenone, and a Flavanone from Ligularia macrophylla

✍ Scribed by Qi Wang; Daofeng Chen

Publisher
John Wiley and Sons
Year
2007
Tongue
German
Weight
199 KB
Volume
90
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Three new compounds, (5__β__,9__β__)‐guaia‐6,10(14)‐dien‐9‐ol (=rel‐(1__R__,3a__S__,5__R__,8a__R__)‐1,2,3,3a,4,5,6,8a‐octahydro‐1‐methyl‐4‐methylene‐7‐(1‐methylethyl)azulen‐5‐ol; 1), 6‐acetyl‐8‐methoxy‐2,3‐dimethylchromen‐4‐one (=6‐acetyl‐8‐methoxy‐2,3‐dimethyl‐4__H__‐1‐benzopyran‐4‐one; 2), and (2__S__)‐3′‐hydroxy‐5′,7‐dimethoxyflavanone (=(2__S__)‐2,3‐dihydro‐2‐(3‐hydroxy‐5‐methoxyphenyl)‐7‐methoxy‐4__H__‐1‐benzopyran‐4‐one; 3) were isolated from the roots and rhizomes of Ligularia macrophylla, together with seven known compounds. Their structures and configurations were elucidated by spectroscopic methods, including 2D‐NMR techniques.

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## Abstract One new triterpene and seven new eremophilane‐type sesquiterpenes were isolated from the roots of __Ligularia sagitta__, among them **1a**, an __O__‐acetylated oleanane type triterpene, **2a** and **3a**, two 11‐nor eremophilane‐type sesquiterpenes, **4a, 5**, and **6**, three standard