New Benzyl Alcohol Glycosides from Pyrus bourgaeana

Abstract

Two new aromatic glycosides, benzyl β-D-glucopyranosyl-(1→2)-[β-D-apiofuranosyl-(1→6)]-β-D-glucopyranoside and p-[β-D-apiofuranosyl-(1→6)]-β-D-glucopyranosyloxy-benzylic alcohol, have been isolated from the aerial parts of Pyrus bourgaeana (Rosaceae). The structures were elucidated by spectral analyses (including 2D-NMR spectral measurements) and chemical methods. Arbutin and four other aromatic glycosides have also been isolated and identified.

Key words

Pyrus bourgaeana - Rosaceae - aromatic glycosides - arbutin - benzyl β-D-glucopyranosyl-(1→2)-[β-D-apiofuranosyl-(1→6)]-β-D-glucopyranoside - p-[β-D-apiofuranosyl-(1→6)]-β-D-glucopyranosyloxy-benzylic alcohol