Tannins and Related Compounds. CXVII. Isolation and Characterization of Three New Ellagitannins, Lagerstannins A,B and C, Having a Gluconic Acid Core, from Lagerstroemia speciosa (L.) PERS.
作者:Takashi TANAKA、Hui-Hong TONG、Ya-Ming XU、Kanji ISHIMARU、Gen-ichiro NONAKA、Itsuo NISHIOKA
DOI:10.1248/cpb.40.2975
日期:——
Lagerstannins A (6), B (11) and C (8), ellagitannins having a gluconic acid core, have been isolated from the fruits and leaves of Lagerstroemia speciosa (L.) PERS. (=L. flos-reginae RETZ.)(Lythraceae). On the basis of chemical and spectroscopic evidence, their structures were established as 2, 3;4, 6-bis-O-(S)-hexahydroxydiphenoyl-D-gluconic acid (6), 2, 3, 5-O-(S, R)-flavogallonyl-4, 6-O-(S)-hexahydroxydiphenoyl-D-gluconic acid (11), and 5-O-galloyl-4, 6-O-(S)-hexahydroxydiphenoyl-D-gluconic acid (8), respectively. Furthermore, the structure of an ellagitannin, punigluconin, previously isolated from the bark of Punica granatum L., was revised as 2, 5-di-O-galloyl-4, 6-O-(S)-hexahydroxy-diphenoyl-D-gluconic acid (10), based on spectral re-examination.
从紫薇(Lagerstroemia speciosa (L.) PERS.)的果实和叶子中分离出了Lagerstannins A (6)、B (11)和C (8),这些埃拉吉单宁以葡萄糖醛酸为核心。根据化学和光谱证据,它们的结构分别确定为2, 3;4, 6-双-O-(S)-六羟基二苯酰-D-葡萄糖醛酸 (6)、2, 3, 5-O-(S, R)-黄酮甘露糖苷-4, 6-O-(S)-六羟基二苯酰-D-葡萄糖醛酸 (11),以及5-O-没食子酸-4, 6-O-(S)-六羟基二苯酰-D-葡萄糖醛酸 (8)。此外,之前从石榴树皮(Punica granatum L.)中分离出的埃拉吉单宁punigluconin,其结构经过光谱重新审查后修订为2, 5-双-O-没食子酸-4, 6-O-(S)-六羟基二苯酰-D-葡萄糖醛酸 (10)。