Chemical Evaluation of Betula Species in Japan. V. Constituents of Betula ovalifolia
1998 年 46 巻 1 号 p. 169-170
詳細
1998 年 46 巻 1 号 p. 169-170
Two new seco-dammarane-type triterpenes, called ovalifoliolides A and B, were isolated from the methanol extract of fresh leaves of Betula ovalifolia together with 12-O-acetylbetulafolienetriol, (3R)-3, 5'-dihydroxy-4'-methoxy-3', 4"-oxo-1, 7-diphenyl-1-heptene and rutin. Betulin, betulin 3-caffeate, rhododendrin, (+)-catechin, (+)-catechin 7-O-β-D-xylopyranoside and procyanidin B-3 were also isolated from the bark. Their structures were determined by spectral data and chemical evidence.
