Tannins and related compounds. VII. Phenylpropanoid-substituted epicatechnins, cinchonains from Cinchona succirubra. (1).
作者:GENICHIRO NONAKA、ITSUO NISHIOKA
DOI:10.1248/cpb.30.4268
日期:——
As a result of an investigation of the relatively lower-molecular-weight phenolics in the bark of Cinchona succirubra (Rubiaceae), cinchonains Ia (1), Ib (2), Ic (3) and Id (4), a new class of flavan-3-ols substituted at the A-ring with a C6-C3 unit, have been isolated, together with caffeic acid (5) and (-)-epicatechin (6). The structures of these compounds have been established on the basis of chemical and spectroscopic evidence. A direct coupling of caffeic acid and (-)-epicatechin leading to the formation of cinchonains has also been achieved.
通过对 Cinchona succirubra(茜草科)树皮中分子量相对较低的酚类化合物进行研究,分离出了 Cinchonains Ia (1)、Ib (2)、Ic (3) 和 Id (4),以及咖啡酸 (5) 和 (-)-epicatechin (6),这是一类在 A 环上被 C6-C3 单元取代的新的黄烷-3-醇。这些化合物的结构是根据化学和光谱证据确定的。此外,还实现了咖啡酸和(-)-表儿茶素的直接偶联,从而形成了金鸡纳类化合物。