Non-Enzymatic Oxidation of a Pentagalloylglucose Analogue into Members of the Ellagitannin Family
作者:Seiya Ashibe、Kazutada Ikeuchi、Yuji Kume、Shinnosuke Wakamori、Yuri Ueno、Takashi Iwashita、Hidetoshi Yamada
DOI:10.1002/anie.201708703
日期:2017.11.27
hypothesized to begin with the oxidation of penta‐O‐galloyl‐β‐d‐glucose (β‐PGG) for the coupling of the galloyl groups. However, the non‐enzymatic behavior of β‐PGG in the oxidation is unknown. Disclosed herein is which galloyl groups tended to couple and which axial chirality was predominant in the derived hexahydroxydiphenoyl groups when an analogue of β‐PGG was subjected to oxidation. The galloyl groups coupled
假设存在1000多种结构不同的鞣花单宁,首先是由于五邻O-没食子酰基-β- d-葡萄糖(β-PGG)的氧化而使没食子酰基偶联。但是,β-PGG在氧化过程中的非酶行为尚不清楚。本文公开了当β-PGG的类似物进行氧化时,哪些没食子酰基趋于偶合,以及哪些轴向手性在衍生的六羟基二苯甲酰基中占主导地位。的没食子酰基耦合以下顺序:在4,6-,1,6-,1,2-,2,3-,和3,6-位置与相应的小号- ,小号- ,- [R - ,小号-和R轴向手性。其中,最优选的4,6偶联反映了天然鞣花单宁的观察结果。一个新的发现是次优耦合发生在1,6位。通过检测3,6耦合产物,这项工作表明,即使具有轴向富集的葡萄糖核的鞣花单宁骨架也可能是非酶促生成的。