Chemical evaluation of Betula species in Japan. I. Constituents of Betula ermanii

Article abstract of DOI:10.1248/cpb.43.1937

The constituents of Betula ermanii CHAM. in Japan were identified as follows. Fresh leaves: 20(S),24(R)-epoxydammmaran-3β,11α,25-triol (1), 3- O-β-D-glucopyranoside of 1 (2), 2'-acetate of 2 (3), 11,2'-diacetate of 2 (4), dammar-24-en-3β,11α,20(S)-triol (5), 3-O-β-D-2-O- acetylglucopyranoside of 5 (6). Outer bark: betulin (7), betulin 3-caffeate (8), oleanolic acid (9). Inner bark: (+)-lyoniresinol 3α-O-α-L- rhamnopyranoside (10), (-)-lyoniresinol 3α-O-β-D-xylopyranoside (11), 9,9'- di-O-feruloyl-(-)-secoisolariciresinol (12), acerogenin E (13), 3,4,5- trimethoxyphenol β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside (14), 4-(4- hydroxyphenyl)-2-butanol 2-O-β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside (15), (+)-catechine 7-O-β-D-xylopyranoside (16), lupeol (17), monogynol A (18). Root outer bark: lupeol caffeate (19), betulin 3-caffeate (8), oleanolic acid caffeate (20), dammarendiol II 3-caffeate (21). Compounds 2, 3, 4, 6, 19 and 21 are new.

Full text of DOI:10.1248/cpb.43.1937

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