Studies on the Constituents of Aceraceae Plants. I. Constituents in the Leaves and the Stem Bark of Acer nikoense MAXIM.

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Abstract
Chemical constituents of the leaves and stem bark of A. nikoense Maxim. (Aceraceae) were examined. .beta.-Amyrin, .beta.-sitosterol contaminated with campesterol and stigmasterol, and .beta.-sitosterol glucoside were obtained from both parts of the plant. .beta.-Amyrin acetate, quercetin, quercitrin and ellagic acid were isolated from the leaves, and scopoletin, (+)-rhododendrol (VIII), (+)-catechin and 2 new glycosides named aceroside I (XI), C25H32O8, mp [melting point] 170-171.degree. (from acetone), [.alpha.]D-7.7.degree., and epi-rhododendrin (XII), C16H24O7, mp 81-84.degree., [.alpha.]D-15.5.degree., from the stem bark. The absolute configuration of VIII was proposed to be S from empirical rule on optical rotation-chirality relationship. Hydrolysis of aceroside I (XI) afforded acerogenin A as its aglycone, whose structure was already reported. The structure of epi-rhododendrin (XII) was elucidated to be (S)-4-(p-hydroxyphenyl)butan-2-ol-.beta.-D-glucopyranoside from chemical and spectral evidence.

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