Triterpenoids from Trichilia havanensis Jacq. Part I. The acetates of havanensin and trichilenone, new tetracarbocyclic tetranortriterpenes

Abstract

Four new tetranortriterpenes, havanensin triacetate (1), havanensin 3,7-diacetate (2), havanensin 1,7-diacetate (3), and trichilenone acetate (5), have been isolated from T.havanensis Jacq. Their structures have been established by spectral and chemical data and by interrelation with each other and with cedrelone (13). N.m.r. spectra can be used to distinguish between Δ¹-3-ones and Δ²-1-ones in these tetranortriterpenes.