Total Synthesis and Structure Revision of (−)-Illisimonin A, a Neuroprotective Sesquiterpenoid from the Fruits of <i>Illicium simonsii</i>
作者:Alexander S. Burns、Scott D. Rychnovsky
DOI:10.1021/jacs.9b05065
日期:2019.8.28
Illisimonin A was isolated from Illicium simonsii and has a previously unreported tricyclic carbon framework. It displayed neuroprotective effects against oxygen-glucose deprivation-induced cell injury in SH-SY5Y cells. It incorporates a highly strained trans-pentalene ring system. We report the first synthesis of (±)-illisimonin A. Notable steps in the route include a 1,3-dioxa-2-silacyclohexene templated
Illisimonin A 是从 Illicium simonsii 中分离出来的,具有以前未报道的三环碳框架。它对 SH-SY5Y 细胞中氧-葡萄糖剥夺诱导的细胞损伤显示出神经保护作用。它结合了高度应变的反式戊烯环系统。我们报告了 (±)-illisimonin A 的首次合成。该路线中值得注意的步骤包括 1,3-dioxa-2-silacyclohexene 模板化的 Diels-Alder 环加成和 3 型半频哪醇重排以生成反戊烯。最后一步是铁催化的 CH 氧化。合成路线稳健,单程制备了 94 mg 外消旋材料。解析中间体,合成天然(-)-illisimonin A。 (-)-illisimonin A的绝对构型修改为1S,4S,5S,6S,7R,9R,