DETAILED FAB MASS SPECTROMETRY AND HIGH RESOLUTION NMR INVESTIGATIONS OF TRICOLORINS A-E, INDIVIDUAL OLIGOSACCHARIDES FROM THE RESINS OF IPOMOEA TRICOLOR (CONVOLVULACEAE)

摘要

Extensive NMR and FAB-MS studies have led to the characterization of tricolorins A-E, major phytogrowth inhibitors present in the allelopathic glycoresin of Ipomoea tricolor Cav. (Convolvulaceae). The purification of these tetraglycosides was successfully achieved by an amino bonded-phase HPLC methodology. Tricolorins B-D differed from the previously reported macrocycle structure of tricolorin A in the site of lactonization as well as in the type and location of short-chain acids ester-linked at the oligosaccharide core (tricoloric acid A). The structure of tricolorin E was based on a new linear tetraglycoside of jalapinolic acid (tricoloric acid B). Copyright (C) 1996 Elsevier Science Ltd. [References: 20]