Tannins and related compounds. XXXI. Isolation and characterization of proanthocyanidins in Kandelia candel (L.) Druce.
作者:FENGLIN HSU、GENICHIRO NONAKA、ITSUO NISHIOKA
DOI:10.1248/cpb.33.3142
日期:——
Together with propelargonidin dimers (14, 15 and 16), and procyanidin trimers (23, 24 and 25) of common types, two novel proanthocyanidin dimers, kandelins A-1 (12) and A-2 (13), and four trimers, kandelins B-1 (19), B-2 (20), B-3 (21) and B-4 (22), which all contain a phenylpropanoid substituent in the upper flavan unit, have been isolated from the bark of Kandelia candel (L.) DRUCE (Rhizophoraceae). Spectroscopic evidence combined with chemical studies involving acid-catalyzed thiolytic degradation permitted the assignment of their structures. The presence in this plant source of flavan-3-ols, (+)-afzelechin (2), (+)-catechin (3), (-)-epicatechin (4) and (+)-gallocatechin (5), known proanthocyanidins B-1 (8), B-2 (9), C-1 (17) and trimer (18), and cinchonains Ia (6), Ib (7), IIa (10) and IIb (11) was also demonstrated.
除了常见类型的丙炔苷二聚体(14、15 和 16)和原花青素三聚体(23、24 和 25)外,还有两种新型原花青素二聚体,即蒲公英苷 A-1 (12)和 A-2 (13),以及四种三聚体、从 Kandelia candel (L.) DRUCE(根状茎)的树皮中分离出了四种三聚体,即蒲公英素 B-1 (19)、B-2 (20)、B-3 (21) 和 B-4 (22),它们都在上部黄烷单元中含有一个苯基丙酮取代基。DRUCE)(Rhizophoraceae)树皮中分离出来。光谱证据与酸催化硫解降解的化学研究相结合,确定了它们的结构。此外,还证明了该植物来源中存在黄烷-3-醇、(+)-阿夫茶精(2)、(+)-儿茶素(3)、(-)-表儿茶素(4)和(+)-儿茶素(5),已知的原花青素 B-1 (8)、B-2 (9)、C-1 (17) 和三聚体 (18),以及金鸡纳素 Ia (6)、Ib (7)、IIa (10) 和 IIb (11)。