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Direct and Post-Synthesis Incorporation of Chiral Metallosalen Catalysts into Metal-Organic Frameworks for Asymmetric Organic Transformations

机译:直接和合成后的手性金属洛萨伦催化剂到金属有机骨架不对称有机转化的合并。

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摘要

Two chiral porous metal-organic frameworks (MOFs) were constructed from [VO(salen)]-derived dicarboxylate and dipyridine bridging ligands. After oxidation of V-IV to V-V, they were found to be highly effective, recyclable, and reusable heterogeneous catalysts for the asymmetric cyanosilylation of aldehydes with up to 95%ee. Solvent-assisted linker exchange (SALE) treatment of the pillared-layer MOF with [Cr(salen)Cl]- or [Al(salen)Cl]-derived dipyridine ligands led to the formation of mixed-linker metallosalen-based frameworks and incorporation of [Cr(salen)] enabled its use as a heterogeneous catalyst in the asymmetric epoxide ring-opening reaction.
机译:由[VO(salen)]衍生的二羧酸盐和二吡啶桥联配体构建了两个手性多孔金属有机骨架(MOF)。将V-IV氧化为V-V后,发现它们是高效,可回收和可重复使用的多相催化剂,可用于醛类不对称氰基硅烷化反应,其ee含量高达95%。用[Cr(salen)Cl]-或[Al(salen)Cl]-二吡啶配体对柱状MOF进行溶剂辅助的接头交换(SALE)处理,导致形成基于混合接头的金属硅铝骨架并引入[Cr(salen)]的化合物使得它可以在不对称环氧化物开环反应中用作多相催化剂。

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