C-Glucosidic ellagitannin oligomers from Melaleuca squarrosa Donn ex Sm., Myrtaceae
作者:Takashi Yoshida、Hideyuki Ito、Morio Yoshimura、Kyoko Miyashita、Tsutomu Hatano
DOI:10.1016/j.phytochem.2007.07.002
日期:2008.12
C-glucosidic ellagitannin dimers were classified as types A-C according to a putative biogenetic oligomerization mode. They were characterized by different positions of the C-C bond between the phenolic acyl unit in one monomer and the benzylic C-1 of the open-chain glucose core in the other monomer. In recent years, four C-glucosidic tannins, melasquanins A-D (18-21), have been found in the leaves
根据假定的生物遗传寡聚化模式,C-糖苷鞣花单宁二聚体被归类为 AC 型。它们的特征在于一种单体中的酚酰基单元与另一种单体中开链葡萄糖核心的苄基 C-1 之间的 CC 键的不同位置。近年来,在白千层 Donn ex Sm 的叶子中发现了四种 C-糖苷单宁,melasquanins AD (18-21)。(桃金娘科)。基于包括各种二维核磁共振 (2D NMR) 实验在内的光谱分析,这些被表征为二聚化模式 (D 型) 的二聚体 (melasquanin A) 和三聚体 (melasquanins BD)。Melasquanins B (19) 和 D (21) 是 C-糖苷单宁三聚体,其结构包含迄今为止未知的非重复缩合模式。