Tannins and related compounds. XCV. Isolation and characterization of helioscopinins and helioscopins, four new hydrolyzable tannins from Euphorbia helioscopia L. (1).
摘要:
对大戟科植物日照大戟(Euphorbia helioscopia L.)中的多酚进行了化学分析,分离出四种新的水解鞣酸,分别命名为helioscopinins A (10) 和 B (9),以及helioscopins A (11) 和 B (12),同时还发现了八种已知的鞣酸(1-8)。根据化学和光谱证据,化合物9-12的结构被确认分别为:1, 6-(S)-六羟基二苯酰基-3-O-鞣酸基-β-D-葡萄糖,1, 6-(S)-六羟基二苯酰基-2, 4-(S)-脱氢六羟基二苯酰基-3-O-鞣酸基-β-D-葡萄糖,1, 6-(S)-六羟基二苯酰基-2, 4-(R)-油青果酸-3-O-鞣酸基-β-D-葡萄糖和1, 3, 6-三-O-鞣酸基-2, 4-(R)-油青果酸-β-D-葡萄糖。
Tannins and related compounds. XCV. Isolation and characterization of helioscopinins and helioscopins, four new hydrolyzable tannins from Euphorbia helioscopia L. (1).
摘要:
对大戟科植物日照大戟(Euphorbia helioscopia L.)中的多酚进行了化学分析,分离出四种新的水解鞣酸,分别命名为helioscopinins A (10) 和 B (9),以及helioscopins A (11) 和 B (12),同时还发现了八种已知的鞣酸(1-8)。根据化学和光谱证据,化合物9-12的结构被确认分别为:1, 6-(S)-六羟基二苯酰基-3-O-鞣酸基-β-D-葡萄糖,1, 6-(S)-六羟基二苯酰基-2, 4-(S)-脱氢六羟基二苯酰基-3-O-鞣酸基-β-D-葡萄糖,1, 6-(S)-六羟基二苯酰基-2, 4-(R)-油青果酸-3-O-鞣酸基-β-D-葡萄糖和1, 3, 6-三-O-鞣酸基-2, 4-(R)-油青果酸-β-D-葡萄糖。
Tannins and Related Compounds. CXVIII. Structures, Preparation, High-Performance Liquid Chromatography and Some Reactions of Dehydroellagitannin-Acetone Condensates.
The dehydroellagitannins having a dehydrohexahydroxydiphenoyl ester group in the molecule were found to undergo highly regio- and stereospecific condensation with acetone in the presence of ammonium ion under almost neutral conditions. This reaction was successfully applied to high-performance liquid chromatographic analysis to detect the dehydroellagitannins in the plant extract. Furthermore, the reactions of the acetone condensates with L-cysteine methyl ester were examined, and appear to be applicable to structural studies of dehydroellagitannins.
From the fresh leaves of Carpinus laxiflora (Betulaceae), two new hydrolyzable tannins, carpinusin (2) and carpinusnin (3), have been isolated, together with thirteen known hydrolyzable tannins and related compounds, and their structures were elucidated on the basis of physico-chemical evidence.