Two novel hydrolyzable tannins, alienanins A (5) and B (13), have been isolated from the leaves of Quercus aliena GLUME (Fagaceae), and their structures were elucidated on the basis of chemical and spectroscopic evidence to be dimeric C-glycosidic ellagitannins in which the hexahydroxydiphenoyl ester group is linked to the C-glycosidic C-1 atom through a carbon to carbon linkage. In addition, the structure elucidation of the monomeric C-glycosidic ellagitannin, epipunicacortein A (1), is also described briefly.
从角栎(壳斗科)的叶子中分离出两种新型可
水解
单宁,外来
单宁 A (5) 和 B (13),并根据
化学和光谱证据阐明了它们的结构,为二聚 C-糖苷鞣花
单宁其中六羟基二苯甲酰基酯基团通过碳碳键连接至C-糖苷C-1原子。此外,还简要描述了单体 C-糖苷鞣花
单宁 Epipunicacortein A (1) 的结构解析。