Herein we report the total syntheses of communesin F and putative members of the communesin family of polycyclic bis-aminal alkaloids. The successful strategy featured a novel organocatalytic reaction between two oxindole subunits to cast, after extensive optimization, the all-carbon vicinal quaternary stereocenters of the target molecule with high enantiocontrol. The resulting bis-oxindole intermediate further underwent a Ti(OⁱPr)₄-mediated dehydrative skeletal rearrangement to furnish the communesin core structure. Consider the ready availability and low-cost of unsubstituted isatin, and the inferior organocatalytic reaction employing a bromo-substituted substrate, a Pd(OAc)₂-catalyzed and oxalamide-directed aryl CH-alkenylation reaction was implemented to assemble the complete skeletal backbone of the target molecule. Collectively, the synthetic technologies disclosed herein constitute the first asymmetric organocatalytic approach to the communesins, together with a highly effective late-stage CH-functionalization in stark contrast to the bromoarene substrates employed in all of the past synthetic work.

中文翻译：

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有机催化和后期CH功能化使Communesin F和推定的Communesins的不对称合成。

在这里，我们报告了共产蛋白F和多环双氨基生物碱的共产蛋白家族的推定成员的总合成。成功的策略是在两个羟吲哚亚基之间进行新颖的有机催化反应，以经过广泛优化后，铸造具有高对映体控制能力的目标分子的全碳邻位四级立体中心。所得的双-羟吲哚中间体进一步经历Ti（O ⁱ Pr）₄介导的脱水骨架重排，以提供突触素核心结构。考虑未取代的靛红的现成可用性和低成本，以及使用溴取代的底物Pd（OAc）₂的劣质有机催化反应进行催化和草酰胺定向的芳基CH-烯基化反应，以组装靶分子的完整骨架骨架。总体而言，本文公开的合成技术构成了对表素的第一种不对称有机催化方法，与高效的后期CH-官能化一起，与过去所有合成工作中使用的溴芳烃底物形成了鲜明的对比。