From the aerial parts of A melanolepis, two new sesquiterpene lactones, melanolepin B (= 1α,4β,8α-trihydroxyeudesm-11(13)-en-12, 6α-olide; 1) and melanolepin C (=1α,10β-epoxy-8β- hydroxygermacra-4(15), 11(13)-dien-12,6α-olide; 2), were isolated, together with four known compounds, desacetyllaurenobiolide, dentatin A, taraxasterol, and (3S,5R)-loliolide. Compound 1 was found to have the rare cis-fused eudesmane skeleton. The structures of the isolated compounds were established by means of NMR (1H, 1H-COSY, 1H,13C-HSQC, HMBC, NOESY) and MS analyses. © 2007 Verlag Helvetica Chimica Acta AG.
Sesquiterpene lactones from Anthemis melanolepis
Karioti A.Secondo
;
2007-01-01
Abstract
From the aerial parts of A melanolepis, two new sesquiterpene lactones, melanolepin B (= 1α,4β,8α-trihydroxyeudesm-11(13)-en-12, 6α-olide; 1) and melanolepin C (=1α,10β-epoxy-8β- hydroxygermacra-4(15), 11(13)-dien-12,6α-olide; 2), were isolated, together with four known compounds, desacetyllaurenobiolide, dentatin A, taraxasterol, and (3S,5R)-loliolide. Compound 1 was found to have the rare cis-fused eudesmane skeleton. The structures of the isolated compounds were established by means of NMR (1H, 1H-COSY, 1H,13C-HSQC, HMBC, NOESY) and MS analyses. © 2007 Verlag Helvetica Chimica Acta AG.File in questo prodotto:
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