A novel pentacyclic triterpenoid, petatrichol B, was isolated from the rhizome of Petasites tricholobus. Its structure was established by means of spectroscopic analysis (EIMS, HRSIMS, IR, 1D NMR and 2D NMR).
Two new ent-kaurenoids, 19-acetyl-ent-3β, 17-dihydroxykaur-15-ene (1), 19-acetyl-ent- 3β-hydroxykaur-15-en-17-al (2) were isolated from Cacalia pilgeriana. Their structures were elucidated by spectroscopic methods.
Two new sesquiterpene lactone glycosides were isolated from the seeds of Carpesium macrocephalum. Their structures were elucidated as 2-O--D-glucopyranosy-5? 11?H- eudesma-4 (15)-en-12, 8?olide and 2 ?O--D-glucopyranosy-5?H-eudesma-4 (15), 11 (13)- dien-12, 8?olide by spectral methods (HRMS, 1 D and 2 D NMR).
From the roots of Ligularia macrophylla, a bisesquiterpene, ligumacrophyllal was isolated and its structure was elucidated on the basis of spectroscopic methods.
Bo FU, Qi Xiu ZHU, Xiu Ping YANG, Zhong Jian JIA* Department of Chemistry, Lanzhou University, Lanzhou 730000
