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This paper is dedicated to Professor Dr. Xiao-Tian Liang on the occasion of his 80th birthday. Abstract Four eudesmane glucosides, alatosides A-D (1-4), and one megastigmane glucoside, alatoside E (5), were isolated from the BuOH fraction of Laggera alata along with six known compounds. Structures of the new compounds were elucidated by a combination of chemical and spectroscopic methods. Alatosides A–E were characterized as: 1a-O-(b-d-glucopyranosyloxyl)-7-epi-eudesma-11-en-2b,4a-diol (1), 2b-O-(b-d-glucopyranosyloxyl)-eudesma-4a-hydroxyl-11(13)-en-12-oic-acid (2), 5b-O-(b-d-glucopyranosyloxyl)-eudesma-4(15),11(13)-dien-12-oic-acid (3), 5a-O-(b-d-glucopyranosyloxyl)-eudesma-3,11(13)-dien-12-oic acid (4) and 3b-O-(b-d-glucopyranosyloxyl)-megastigma-9-one (5), respectively. Based on the chemical characteristics of eudesmane derivatives isolated from the Laggera genus, it was suggested that there are probably two different biogenetic pathways for these secondary metabolites in this genus.

Laggera alata， Compositae， Eudesmane， Megastigmane， Alatoside

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2005年03月08日

【期刊论文】Eudesmane Derivatives and Other Sesquiterpenes from Laggera alata

赵昱， Qun Xiong Zheng， †， § Zhao Jun Xu， † Xian Feng Sun， ‡ Francüoise Guéritte， ┴ Michele Cesario， ┴ Han Dong Sun， ‡ Christopher H. K. Cheng， || Xiao-Jiang Hao， ‡ and Yu Zhao*

J. Nat. Prod. 2003, 66, 1078-1081，-0001，（）：

-1年11月30日

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Three new eudesmane sesquiterpenes, 5

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浙江大学，浙江

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