Production of Ellagitannin Hexahydroxydiphenoyl Ester by Spontaneous Reduction of Dehydrohexa-hydroxydiphenoyl Ester
作者:Manami Era、Yosuke Matsuo、Yoshinori Saito、Takashi Tanaka
DOI:10.3390/molecules25051051
日期:——
6-(R)-DHHDP is spontaneously degraded to give HHDP, whereas 2,4-(R)-DHHDP is stable. The driving force of the selective reduction of the 3,6-DHHDP of amariin is shown to be the conformational change of glucose from O,3B to 1C4. Heating geraniin with pyridine affords 2,4-(R)-DHHDP reduction products. Furthermore, the acid hydrolysis of geraniin yields two equivalents of ellagic acid. Although the reaction
Amariin 是一种鞣花单宁,具有连接葡萄糖 2,4- 和 3,6- 羟基的两个脱氢六羟基二苯甲酰基 (DHHDP) 部分。这种单宁在 Triadica sebifera 和 Carpinus japonica 的幼叶中占主导地位。然而,随着叶子的生长,3,6-DHHDP 会转化为其还原形式,即六羟基二苯甲酰 (HHDP) 基团,以生成香叶素,这是成熟叶子中的主要鞣花单宁。纯化的苋菜红在水溶液中不稳定,3,6-(R)-DHHDP 会自发降解为 HHDP,而 2,4-(R)-DHHDP 是稳定的。研究表明,菊苣的 3,6-DHHDP 选择性还原的驱动力是葡萄糖从 O,3B 到 1C4 的构象变化。用吡啶加热香叶素得到 2,4-(R)-DHHDP 还原产物。此外,香叶素的酸水解产生两当量的鞣花酸。