Constituents of <i>Alphitonia</i> Species. III. Alphitexolide, a New Triterpene, and Other Extractives

Abstract

The extractives of the barks and leaves of Alphitonia excelsa , A. petriei , and A. whitei , and of the wood, bark, and leaves of A. macrocarpa have been examined. Ceanothic, betulinic, and alphitolic acids were isolated from all species, but A. macrocarpa was exceptional in that its wood contained no benzylhydroxycoumarone derivative, characteristic of the other species, and its leaves gave a small yield of the alkaloid, adouetine X. From the bark of A. excelsa a new triterpene, alphitexolide, was isolated in very small amount. By spectroscopic methods and a partial synthesis its structure was established as(1).