Structures of New Friedelane- and Norfriedelane-Type Triterpenes and Polyacylated Eudesmane-Type Sesquiterpene from Salacia chinensis LINN. (S. prinoides DC., Hippocrateaceae) and Radical Scavenging Activities of Principal Constituents

Abstract

Two new friedelane-type triterpenes, salasones D and E, a new norfriedelane-type triterpene, salaquinone B, and a new polyacylated eudesmane-type sesquiterpene, salasol B, were isolated from the stems of Salacia chinensis LINN. (S. prinoides DC., Hippocrateaceae) collected in Thailand. Their stereostructures were elucidated on the basis of chemical and physicochemical evidence. Some norfriedelane-type triterpene, lignan, and catechin constituents were found to show radical scavenging activity.