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Isomeric Eremophilane Lactones from Senecio tsoongianus
Author(s) -
Zhao Yu,
Jiang Hao,
MacLeod Murray,
Parsons Simon,
Rankin David W. H.,
Wang Peng,
Cheng Christopher H. K.,
Shi Hao,
Hao Xiaojiang,
Guéritte Françoise
Publication year - 2004
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.200490115
Subject(s) - chemistry , epimer , sesquiterpene , stereochemistry , senecio , asteraceae , terpenoid , two dimensional nuclear magnetic resonance spectroscopy , botany , biology
From the whole plant of Senecio tsoongianus , two pairs of epimers, tsoongianolides A ( 1 ) and B ( 2 ), and tsoongianolides C ( 3 ) and D ( 4 ), and two new sesquiterpene lactones, tsoongianolides E ( 5 ) and F ( 6 ), all of which possess the eremophilane skeleton, were isolated. Two known eremophilane dimers ( 7 ) and ( 8 ) were also obtained from this species. Their absolute structures were elucidated by 1D‐ and 2D‐NMR techniques and by X‐ray diffraction studies, along with chemical evidence.