Tannins and related compounds. LXXXVIII. Isolation and characterization of hydrolyzable tannins from Mallotus japonicus (Thunb.) Mueller-Arg. and M. philippinensis (Lam.) Mueller-Arg.
作者:Reiko SAIJO、Gen-ichiro NONAKA、Itsuo NISHIOKA、Ih-Sheng CHEN、Tieh-Horng HWANG
DOI:10.1248/cpb.37.2940
日期:——
Further chemical examination of the bark and the leaves of Mallotus japonicus (THUNB.) MUELLER-ARG. (Euphorbiaceae) has led to the isolation of two new tannins [named mallotannins A (16) and B (18)]. Based on chemical and spectroscopic evidence, the structures of 16 and 18 were established to be dimeric hydrolyzable tannins in which the free carboxylic acid in mallotinic acid is connected to the C-6 position of bergenin and D-glucose, respectively. On the other hand, fifteen known tannins and related compounds have been isolated from the leaves of M. philippinensis (LAM.) MUELLER-ARG. and identified by comparisons of their physical and spectral data with those of authentic samples. In addition, a survey of tannin patterns in Mallotus species is presented.
对日本野百合(Mallotus japonicus (THUNB.) MUELLER-ARG.)(大戟科植物)的树皮和叶子进行的进一步化学检查,分离出了两种新的单宁酸[命名为野百合单宁酸 A (16) 和 B (18)]。(大戟科)分离出了两种新的单宁酸[命名为毛果芸香单宁酸 A(16)和 B(18)]。根据化学和光谱证据,16 和 18 的结构被确定为二聚体可水解单宁酸,其中毛果芸香酸中的游离羧酸分别与小檗碱和 D-葡萄糖的 C-6 位置相连。另一方面,从 M. philippinensis (LAM.) MUELLER-ARG. 的叶子中分离出了 15 种已知的单宁酸和相关化合物,并通过将其物理和光谱数据与真实样本进行比较进行了鉴定。此外,还对 Mallotus 树种的单宁模式进行了调查。