Guaianolides and chromenes from Calea species |
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| Authors: | Alfonso G Ober Lowell E Urbatsch Nikolaus H Fischer |
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| Institution: | 1. Department of Botany, Louisiana State University, Baton Rouge, LA 70803, U.S.A. |
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| Abstract: | Chemical analysis of Calea berteriana yielded, besides the known flavonoid acacetin and the sesquiterpene lactone calbertolide C, three new guaianolides, desacyl-8-tiglylsubcordatolide A and 8-epi-8-tiglylrupicolins A and B. C. prunifolia provided acacetin, calbertolide C, desacyl-8-tiglylsubcordatolide A, and two new chromenes, prunichromenes A and B. From C. solidaginea acacetin, heliangine, calbertolide C, 8-epi-8-tiglylrupicolin A and desacyl-8-tiglylsubcordatolide A were isolated. The structures of the new compounds were established by chemical and spectral methods. |
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| Keywords: | Asteraceae Heliantheae sesquiterpene lactones guaianolides heliangolides 2 2-dimethylchromenes |
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