Sesquiterpene lactones and other constituents of allagopappus species

Abstract

Analysis of the aerial parts of two Allagopappus species has yielded several known compounds and new sesquiterpene lactones related to the ineupatorolides: compound 3 was obtained from A. viscosissimus, compound 12 from A, dichotomus ssp, latifolius, and compounds 20, 21, and a mixture of 22 and 23 from A, dichotomus ssp, dichotomus. New thymol derivatives were isolated from A. dichotomus ssp. latifolius [5] and A. dichotomus ssp. dichotomus [5 and 16] The structures of these new natural products were established by spectroscopy, and the chemotaxonomy of the genus as a whole is briefly discussed.