Dihydroroseoside, a new cyclohexanone glucoside, from the leaves of shirakamba (Betula platyphylla Sukatchev var. japonica Hara)

Abstract

A new cyclohexanone glucoside (II) and a known cyclohexenone glucoside roseoside [I, (6S, 9S)-6-hydroxy-6-(9-β-D-glucopyranosyloxy-trans-7-butenyl)-l,5,5-trimethyl- l-cyclohexenone] were isolated from an ethanol extract of shirakamba (Betula platyphylla Sukatchev var. japonica Hara) leaves. The structure of II was determined to be (6S, 9R)-6-hydroxy-6-(9-O-β-D-glucopyranosyloxy-trans-7-butenyl)-l,5,5- trimethyl-l-cyclohexanone by 1H-NMR and 13C-NMR spectroscopic analyses. It was named dihydroroseoside. © The Japan Wood Research Society 2001.