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Sesquiterpenoids from Tibetan Folk Drug Pulicaria insignis

HUANG Sheng-zhuo1,3,JIANG Si-ping2,ZHU Hua-jie11State key laboratory of Phytochemistry and Plant Rescources of West of China,Kunming Institute of Botany,Academy of Sciences Kunming 650204,Yunnan China;2Plateau Institute of Biology Lhasa 850001,Tibet China;3Graduate University of Chinese Academy of Sciences Beijing 100049,China  
Eleven known sesquiterpenoids were isolated from the Tibetan Folk Drug Pulicaria insignis.On the basis of MS and NMR data,they were identified as Xanthanolide(1),(3αR,4αR,5R,7αS,9αS)-5-Hydroxy -5-methyl-3,8-dimethylenedecahydroazulenofuran-2(3H)-one(2),10α-hydroxy-14H-inuviscolide(3),(3R,3αR,4αS,7αS,8S,9αS)-3,4α,8-Trimethyldecahydroazulenofuran-2,5-dione(4),8-Epi-conferti(5),(3αR,5S,11αS,E)-5-Hydroxy-10-methyl-3,6-dimethylene-3α,4,5,6,7,8,11,11α,-octahydrocyclodeca[α] furan-2(3H)-one(6),(3αR,8αR,9αR)-5,8α-Dimethyl-3-methylene-3α,4,8,8α,9,9α-hexahydronaphtho furan-2,6(3H,7H)-dione(7),Pterodonoic acid(8),8-Epi-isovangustin(9),(3αR,4αS,8R,8αR,9αR)-8 -Hydroxy-5,8α-dimethyl-3-methylene-3,3α,4,4α,8,8α,9,9α-octahydronaphthofuran-2(7H)-one(10) (5S,8αR,9αR)-3-(Hydroxymethyl)-5,8α-dimethyl-6,7,8,8α,9,9α-hexahydronaphthofuran-2(5H) one(11).All compounds were isolated from this plant for the first time,and the 13C NMR data of compounds 6 and 9 were shawed in this paper.
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