marine natural products. Herein, we report a unified strategy that enables the divergent syntheses of various Plakortin polyketides with high step-economy and overall efficiency. As proof-of-concept cases, the enantioselective total syntheses of (+)-hippolachnin A, (+)-gracilioether A, (-)-gracilioether E, and (-)-gracilioether F have been accomplished based on a series of bio-inspired, rationally designed
Plakortin 聚酮化合物代表了一类结构和生物学上引人入胜的海洋天然产品。在此,我们报告了一种统一的策略,该策略能够以高步骤经济性和整体效率实现各种 Plakortin 聚酮化合物的不同合成。作为概念验证案例,基于一系列生物技术完成了 (+)-hippolachnin A、(+)-gracilioether A、(-)-gracilioether E 和 (-)-gracilioether F 的对映选择性全合成。 - 启发、合理设计或偶然发现的转化,其中包括 (1) 有机催化不对称 1,4-共轭加成,以将常见的手性 γ-丁烯内酯中间体组装到所有上述目标,(2) 具有挑战性的仿生 [2] +2] 光环加成形成 (+)-hippolachnin A 的氧杂环丁戊烯核心,
Manganese-Catalyzed Regioselective C–H Lactonization and Hydroxylation of Fatty Acids with H<sub>2</sub>O<sub>2</sub>
作者:Vladimir I. Kurganskiy、Roman V. Ottenbacher、Mikhail V. Shashkov、Evgenii P. Talsi、Denis G. Samsonenko、Konstantin P. Bryliakov
DOI:10.1021/acs.orglett.2c03458
日期:2022.12.9
selective C–H lactonization of fatty acids (C5–C16), catalyzed by manganese(II) complexes bearing bis-amino-bis-pyridine ligands. The catalyst system uses the environmentally benign hydrogen peroxide as oxidant and exhibits high efficiency (100–200 TON), providing under optimized conditions γ-lactones in 60–90% yields. Remarkably, by changing the reaction conditions, the oxidation of hexanoic acid can be