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Regioselectivity Control in the Metal-Catalyzed Functionalization of gamma-Allenols, Part 2: Theoretical Study

机译:金属催化的γ-烯丙醇官能化中的区域选择性控制,第2部分:理论研究

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摘要

The gold-, palladium- and lanthanum-catalyzed oxycyclization reactions of azetidin-2-one-tethered gamma-allenol derivatives to a variety of fused enantiopure tetrahydrofurans, dihydropyrans, and tetrahydrooxepines have been developed experimentally (Part 1. accompanying paper). The mechanisms of these regiocontrolled metal-catalyzed heterocyclization reactions have now been computationally explored at the DFT level (Part 2). The energies of the reaction intermediates and transition states for different possible pathways have been calculated in various model systems very close to the real system. Additionally, we selected the La[N(SiH3)(2)](3) complex to simulate the lanthanide amide precatalyst species. The agreement of theoretically predicted and experimentally observed selectivities is very good in all cases
机译:实验开发了金,钯和镧催化的氮杂环丁烷-2-酮连接的γ-烯丙醇衍生物与各种稠合的对映纯四氢呋喃,二氢吡喃和四氢氧杂环丁烷的氧化环化反应(第1部分,随附论文)。这些区域控制的金属催化的杂环化反应的机理现已在DFT级别上进行了计算探索(第2部分)。在非常接近真实系统的各种模型系统中,已经计算出了不同中间路径的反应中间体的能量和过渡态。此外,我们选择了La [N(SiH3)(2)](3)配合物来模拟镧系元素酰胺预催化剂。在所有情况下,理论上预测的和实验观察到的选择性的一致性都很好

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