Phytotoxic withanolides from Jaborosa rotacea

VIVIANA NICOTRA, NATALIA RAMACCIOTTI, ROBERTO GIL, JUAN C. OBERTI, GABRIELA FERESIN, CECILÑIA GUERRERO, RICARDO BAGGIO, M.TERESA GARDLAND AND GERARDO BURTON

JOURNAL OF NATURAL PRODUCTS

American Chemical Society

Año: 2006 vol. 69 p. 783 - 783

0163-3864

p>n a 21 hydroxy and 12 ketone (13) and the closely related jaborosalactone R were also isolated. New compounds were fully characterized by a combination of spectroscopic methods (1D and 2D NMR and MS).The structures of the spiranoid withanolides and of the epimer of trechonolide A were confirmed by X-ray diffraction studies. Compunds 4,5,6 and 8 showed selective phytotoxicity toward monocotyledoneous and dicotyledoneous species