Lupane Pentacyclic triterpenes isolated from stems and branches of Maytenus imbricata (Celastraceae).

Abstract

Four lupane pentacyclic triterpenes were isolated from the hexane extract of stems and branches of Maytenus imbricata Mart.ex Reissek: 3-oxolup-20(30)-en-29-al (1), 30-hydroxylup-20(29)-en-3-one (2), (11α)-11-hydroxylup-20(29)-en-3-one (3), and (3β)-lup-20(30)-ene-3,29-diol (4). The structural identification of 1–4 was achieved by 1H- and 13C-NMR techniques, including 2D experiments (HSQC, HMBC, and NOESY).