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

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. T...

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Veröffentlicht in:	Chemical & pharmaceutical bulletin 2012/10/01, Vol.60(10), pp.1347-1350
Hauptverfasser:	Yamashita-Higuchi, Yukiko, Sugimoto, Sachiko, Matsunami, Katsuyoshi, Otsuka, Hideaki
Format:	Artikel
Sprache:	eng
Schlagworte:	(E)-2,5-dihydroxycinnamic acid Arbutin - chemistry Arbutin - isolation & purification Coumaric Acids - chemistry Coumaric Acids - isolation & purification Glucose - chemistry Glucose - isolation & purification Glycosides - chemistry Glycosides - isolation & purification Grevillea robusta grevilloside Magnetic Resonance Spectroscopy Phenols - chemistry Phenols - isolation & purification Plant Leaves - chemistry Proteaceae Proteaceae - chemistry robustaside B robustaside C
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Beschreibung
Zusammenfassung:	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.
ISSN:	0009-2363 1347-5223
DOI:	10.1248/cpb.c12-00549