Chemical Evaluation of Betula Species in Japan. VI. Constituents of Betula schmidtii.

1 January 1998

journal article
Published by Pharmaceutical Society of Japan in CHEMICAL & PHARMACEUTICAL BULLETIN

Vol. 46 (6) , 1051-1053
https://doi.org/10.1248/cpb.46.1051

Abstract

The constituents of Betula schmidtii REGAL were identified as follows. Fresh leaves : methyl (12R, 20S)-20-hydroxy-12-β-D-xylopyranosyloxy-3, 4-secodammara-4(28), 24-dien-3-oate (betula-schmidtoside A)^*, myricetin 3-O-α-L-arabinofuranoside, myricetin 3-O-α-L-rhamnopyranoside, myricetin 3O-β-D-galactopyranoside, (-)-rhodo-dendrol 4'-O-β-D-glucopyranoside^*. Outer bark : betulin, lupeol, oleanolic acid, betulone, betulonic acid.Inner bark : (+)-catechin, (3R)-3, 5'-dihydroxy-4'-methoxy-3', 4"-oxo-1, 7-diphenyl-1-heptene, (-)-lyoniresinol 3α-O-β-D-xylopyranoside, (+)-lyoniresinol 3α-O-β-D-glucopyranoside, monogynol A, ssioriside, (-)-rhododendrol 4'-O-β-D-glucopyranoside^*, (-)-rhododendrol 4'-O-α-L-arabinofuranosyl-(1→6)-β-D-glucopyranoside^*. Root bark : oleanolic acid 3-caffeate, 27-hydroxyoleanolic acid 27-caffeate. The three compounds with asterisks are new.

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