期刊
TETRAHEDRON
卷 58, 期 2, 页码 279-282出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4020(01)01139-5
关键词
dimeric thymol derivatives; terpenes and terpenoids; oxidation; X-ray crystal structure
Recently we described a dimeric thymol derivative 1 with a novel spiro[benzofuran-3(2H),2'-pyrano[2,3-b]benzofuran] ring system isolated from Arnica sachalinensis (Asteraceae), but the stereochemistry of this compound remained unclear. Attempts to simplify the structure by oxidation of the hemiacetal to the lactone only resulted in the formation of degradation products. Therefore we produced suitable crystals to perform X-ray analysis, which finally showed that 1 consisted of a mixture of two enantiomers with the following configuration: 8R,8'S,9S,9'S and 8S,8'R,9R,9'R. (C) 2002 Elsevier Science Ltd. All rights reserved.
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