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

Yukiko Yamashita-Higuchi; Sachiko Sugimoto; Katsuyoshi Matsunami; Hideaki Otsuka

doi:10.1248/cpb.c12-00549

Notes

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

Yukiko Yamashita-Higuchi, Sachiko Sugimoto, Katsuyoshi Matsunami, Hideaki Otsuka

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Keywords: Grevillea robusta, Proteaceae, robustaside B, robustaside C, (E)-2,5-dihydroxycinnamic acid, grevilloside

JOURNAL FREE ACCESS

2012 Volume 60 Issue 10 Pages 1347-1350

DOI https://doi.org/10.1248/cpb.c12-00549

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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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