1.
Phytochemistry
; 57(1): 125-30, 2001 May.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11336253
RESUMO
The investigation of an Argentine collection of Enydra anagallis afforded sesquiterpene lactones of the melampolide type two of which were previously known. Their structures were elucidated by spectroscopic methods.
Assuntos
Asteraceae/química , Lactonas/isolamento & purificação , Sesquiterpenos/isolamento & purificação , Lactonas/química , Sesquiterpenos/química , Análise Espectral
2.
J Nat Prod
; 63(10): 1323-8, 2000 Oct.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11076545
RESUMO
The aerial parts of an Argentinian collection of Acanthospermum hispidum afforded 26 sesquiterpene lactones, including the two guaianolides (1 and 2) having a novel oxygen bridge between C-4 and C-14, three new cis,cis-germacranolides (4, 7, and 8), and two new melampolides (25 and 26). Guaianolides 1 and 2 seem to derive biosynthetically from the germacranolide 27 having the (1)D(14, 15)D(5) conformation. The structures were elucidated using extensive spectroscopic analysis.