Biebsanin — A new susquiterpene lactone fromAchillea biebersteinii andA. santolina
Continuing a study of the lactones of Achillea biebersteinii [i] and A. santolina, from the mother liquors [2, 3] by means of the systems chloroform-ethanol (30:1) and benzene--ethyl acetate (1:1) we have isolated a new chlorine-containing sesquiterpene lactone with the composition C15HzgO~CI (ethyl acetate), mp 258-259°C (in a preheated metal block), [u]~ ° --34 ° (c 1.0; pyridine), M + 330, which we have called biebsanin (I).
Rupicolin-A and -B, rupin-A and -B, and cumambrin-B oxide from Artemisia tripartita ssp. Rupicola
Abstract Five new sesquiterpene Iactones have been isolated from Artemisia tripartita Rydb. ssp. rupicola Beetle. The compounds, all guaianolides, are structurally related in what appears to be a sequence in which epoxidation plays the principal role.
Sesquiterpenoid lactones of Artemisia. Constituents of Artemisia cana ssp. Cana. the structure of Canin
Abstract In addition to the known, 5,4′-dihydroxy-3,6,7,3′-tetramethoxyflavone, five sesquiterpenoid lactones have been isolated from Artemisia cana Pursh. ssp. cana . These include the new compounds canin, artecanin, and ridentin, and the known matricarin and deacetylmatricarin. The structure of canin, a new guaianolide, has been shown to be IV on the basis of chemical transformations and spectral evidence.