Reinvestigation of Structures of Robustasides B and C, and Isolation of (<i>E</i>)-2,5-Dihydroxycinnamic Acid Esters of Arbutin and Glucose from the Leaves of <i>Grevillea robusta</i>

Chemical and Pharmaceutical Bulletin
2012.0

Abstract

From the leaves of Grevillea robusta, compounds whose NMR data were superimposable on those of robustasides B and C were isolated along with two new compounds, (E)-2,5-dihydroxycinnamic acid esters of arbutin and D-glucose, and two known compounds, robustaside A and (E)-2,5-dihydroxycinnamic acid. The structures of robustasides B and C were not arbutin caffeates, being revised to arbutin (E)-2,5-dihydroxycinnamic acid esters.

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