STUDIES ON THE CONSTITUENTS OF AMARANTHUS-CAUDATUS LEAVES - ISOLATIONAND STRUCTURE ELUCIDATION OF NEW TRITERPENOID SAPONINS AND IONOL-DERIVED GLYCOSIDES

The isolation of seven triterpenoid saponins (1-7) is reported, among them three new natural products (1-3), together with three new ionol-d erived glycosides (8-10) from the MeOH extract of the leaves of Amaran thus caudatus (Amaranthaceae). All structures were elucidated by spect roscopic methods, including the concerted application of one-dimension al (H-1, TOCSY, C-13, and C-13 DEPT NMR) and two-dimensional NMR techn iques (DQF-COSY, HSQC, HMBC, ROESY). A comparative study of seeds and leaves has been also carried out.