On the Mechanism of the Reductive Metallation of Asymmetrically Substituted Silyl Chlorides
作者:Martin Oestreich、Gertrud Auer、Manfred Keller
DOI:10.1002/ejoc.200400622
日期:2005.1
investigation of the stereochemical course of the reductive metallation of silyl chlorides with silicon-centred chirality has revealed two major events which are detrimental to stereoselection during silyl anion formation: (1) chloride-induced racemisation of silyl chlorides and (2) nonstereoselective formal dimerisation during metallation providing the corresponding disilane. In control experiments, the stereochemical
?True? Chirality Transfer from Silicon to Carbon: Asymmetric Amplification in a Reagent-Controlled Palladium-Catalyzed Hydrosilylation
作者:Martin Oestreich、Sebastian Rendler
DOI:10.1002/anie.200462355
日期:2005.3.4
A Convergent Method for the Synthesis of Highly Enantiomerically Enriched Cyclic Silanes with Silicon-Centered Chirality
作者:Martin Oestreich、Ulrike K. Schmid、Gertrud Auer、Manfred Keller
DOI:10.1055/s-2003-42477
日期:——
1-sila-1,2,3,4-tetrahydronaphthalenes and a corresponding phenanthrene derivative. Facile large scale syntheses of 3-(2-bromoaryl)propyl bromides as well as dichlorosilanes have been elaborated. This highly convergent methodology relies on the novel (-)-menthyl-oxy-substituted dichlorosilanes, which have the chiral auxiliary for the subsequent optical resolution installed. These enantiopure dichlorosilanes
已经开发了一种制备简单的方法,该方法允许将含硅碳环组装为非对映异构体的混合物,而硅是立体信息的唯一中心。手性环状硅烷的一步构建是通过等摩尔量的二溴化物和手性改性的二氯硅烷在 Barbier 条件下反应实现的,从而可以获得几种单官能化的 1-sila-1,2,3,4-tetrahydronaphthalenes 和相应的菲衍生物. 3-(2-溴芳基)丙基溴以及二氯硅烷的简便大规模合成已经被阐述。这种高度收敛的方法依赖于新型 (-)-薄荷氧基取代的二氯硅烷,它具有手性助剂,用于随后的光学拆分。这些对映体纯二氯硅烷是对具有硅中心手性的硅烷的通用模块化一步方法的有用构建块,因为该策略避免了文献中报道的线性序列。已对 1-苯基-1-sila-1,2,3,4-四氢萘衍生物的光学分辨率进行了示例性优化,并通过 X 射线晶体学确定了绝对构型。手性助剂通过简单的还原进行立体定向置换,从而提供高度对映体富集的硅烷