Bioinspired Total Synthesis of (−)-Vescalin: A Nonahydroxytriphenoylated<i>C</i>-Glucosidic Ellagitannin
作者:Antoine Richieu、Philippe A. Peixoto、Laurent Pouységu、Denis Deffieux、Stéphane Quideau
DOI:10.1002/anie.201707613
日期:2017.10.23
first total synthesis of the 2,3,5‐O‐(S,R)‐nonahydroxytriphenoylated (NHTP) C‐glucosidic ellagitannin (−)‐vescalin was accomplished through a series of transformations mimicking the sequence of events leading to its biogenesis. The key steps of this synthesis encompass a Wittig‐mediated ring opening of a glucopyranosic hemiacetal, a C‐glucosidation event through a phenolic aldol‐type reaction, and a W
2,3,5 - O-(S,R)-壬羟基三苯甲酰化(NHTP)C-葡萄糖苷鞣花单宁(-)-维斯卡林的第一个全合成是通过模拟导致其生物发生的事件序列的一系列转化来完成的。该合成的关键步骤包括维蒂希介导的吡喃葡萄糖半缩醛的开环,通过酚醛羟型反应进行的C-葡萄糖苷化事件以及Wynberg-Feringa-Yamada型氧化酚醛偶联,其锻造了NHTP单元。 (-)-维斯卡林