LAGRENYL ACETATE AND LAGERENOL, TWO TETRACYCLIC TRITERPENOIDS WITH THE CYCLOARTANE SKELETON FROM LAGERSTROEMIA LANCASTERI

Article abstract of DOI:10.1016/0031-9422(83)80164-2

Lagerenyl acetate and lagerenol, two new tetracyclic triterpenoids with the cycloartane skeleton, together with four other triterpenoids 2α-hydroxy-3β-E-p-coumaryloxy-urs-12-en-28-oic acid (jacoumaric acid, isolated as its monoacetylmethylcarboxylate derivative), 2α-hydroxyursolic acid (isolated as its diacetate), germanicyl acetate and friedelin, and sitosterol were isolated from the leaves and twigs of Lagerstroemia lancasteri.The structures of lagerenyl acetate and lagerenol were established as 3β-acetoxycycloart-24-one and 3β-hydroxycycloart-24-one, respectively, on the basis of spectral and chemical evidence.Key Word Index - Lagerstroemia lancasteri; Lythraceae; triterpenoids; lagerenyl acetate; lagerenol; 2α-hydroxy-3β-E-p-coumaryloxy-urs-12-en-28-oic acid; 2α-hydroxyursolic acid; germanicyl acetate; friedelin; β-sitosterol.