Friedolabdanes and other constituents from chilean Haplopappus species

Abstract

From the aerial parts of Haplopappus pulchellus two new labdanes and six friedolabdanes were isolated while H. arbutoides afforded in addition to known labdanes five new ones, two clerodanes and a cyperone derivative. Haplopappus remyanus gave two further labdanes, six monoterpene esters and three known flavanones while H. rengifoanus afforded large amounts of liguloxide. Haplopappus marginalis gave no characteristic compounds. The chemistry of the genus is discussed. © 1991.