Secoiridoid glucosides from Fraxinus oxycarba

Abstract Three secoiridoid glucosides, fraxicarboside A, 6″- O - trans - p -coumaroyl-10-hydroxyoleuropein, fraxicarboside B, 6″- O - trans -caffeoyl-10-hydroxyoleuropein, and fraxicarboside C, 3″- O -acetyl-6″- O - trans -caffeoyl-10-hydroxyoleuropein have been isolated for the first time from the leaves of Fraxinus oxycarba Willd. together with four known secoiridoids; oleuropein, ligstroside, 10-hydroxyoleuropein and 10-hydroxyligstroside, three known lignans; (+)- pinoresenol -4′-O-β- d -glucopyranoside , (+)- fraxiresinol -1-O-β- d -glucopyranoside and (+)-1- hydroxypinoresinol -4′-O-β- d -glucopyranoside , two known phenylpropanoid glycosides; verbascoside (=acteoside), and 6-O- caffeoyl -β- d -glucopyranoside , and three known flavonol glycosides; kaempferol -3-O-β- d -glucopyranoside , kaempferol -3-O-α- l -rhamnopyranosyl -(1→6)-β- d -glucopyranoside and quercetin -3-O-α- l -rhamnopyranosyl -(1→6)-β- d -glucopyranoside . The complete 1 H and 13 C NMR spectral assignments of the new compounds were confirmed by the conventional 1D NMR methods and 2D shift-correlated techniques: COSY, HMBC and HMQC.

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