Triterpenoidal constituents from Eucalyptus camaldulensis var. obtusa leaves

An investigation on the constituents of the fresh, uncrushed leaves of Euca lyptus camaldulensis var. obtusa has led to the isolation of the triterpeno id amirinic acid and four known triterpenoids ursolic acid lactone, betulin ic acid, oleanolic acid and ursolic acid. Amirinic acid transformed into am irolide in deuterated chloroform at room temperature. The new products were characterized by exhaustive spectroscopic studies as 2 alpha,3 beta,7 beta -trihydroxy-11 alpha-methoxyurs-12-en-28-oic acid and 2 alpha,3 beta,7 beta -trihydroxyurs-11-en-28,13 beta-olide. (C) 2000 Elsevier Science Ltd. All r ights reserved.