✍ Scribed by Lyi Li; Li-Wen Xu; Han-Qing Wang
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Four new eremophilanolides, isolated from Ligularia sagitta, were identified as (1__β__,3__β__,6__β__,8__β__,10__β__)‐6‐acetoxy‐3‐(angeloyloxy)‐1,10‐epoxy‐8‐hydroxyeremophil‐7(11)‐en‐8,12__α__‐olide (1), (1__β__,3__β__,6__β__,8__β__,10__β__)‐3‐(angeloyloxy)‐1,10‐epoxy‐6,8‐dihydroxyeremophil‐7(11)‐en‐8,12__α__‐olide (2), (1__β__,3__β__,6__β__,8__β__,10__β__)‐3‐(angeloyloxy)‐1,10‐epoxy‐8‐ethoxy‐6‐hydroxyeremophil‐7(11)‐en‐8,12__α__‐olide (3), and (1__β__,3__β__,8__β__,10__β__)‐3‐(angeloyloxy)‐1,10‐epoxy‐8‐hydroxyeremophil‐7(11)‐en‐8,12__α__‐olide (4). Their structures were elucidated by spectroscopic methods, including 2D‐NMR techniques and chemical transformations.
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A phytochemical study on the roots and rhizomes of Ligularia hodgsonii led to the isolation of seven new eremophilanolides (1 -7), their structures were established as (1R,4S,5S,6R,8S,10R)-1-acetoxyeremophil-7(11)-en-6,15;8,12-diolide (1), (1R,4S,5S,6R,8S,10R)-1-acetoxy-8b-hydroxyeremophil-7( 11)-en
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