Studies on the Constituents of Aceraceae Plants. XII. Two New Diarylheptanoid Glycosides from Acer triflorum

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Two new diarylheptanoid glycosides, named aceroside XII (7), C₃₀H₄₂O₁₂, [α]_D 70.3°, and aceroside XIII (8), C₂₅H₃₄O₈, [α]_D -40.2°, were isolated along with triterpenoids and caffeoyl esters from the branches of Acer triflorum KOM. (Aceraceae). On acid hydrolysis, 7 yielded (-)-centrolobol (9), glucose and apiose. On partial hydrolysis, 7 gave 8 and apiose. Acerosides XII (7) and XIII (8) were determined to be the 4''-O-β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside and the 4''-O-β-D-glucopyranoside of (-)-centrolobol, respectively, on the basis of chemical and spectral evidence.