Planar Chiral, Ferrocene-Stabilized Silicon Cations.

Planar Chiral, Ferrocene-Stabilized Silicon Cations.
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平面手性二茂铁稳定硅阳离子。

DOI:
10.1002/chem.201504777
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
M. Oestreich
M. Oestreich
中科院分区:
--
文献类型:
--
作者:
Ruth K. Schmidt;H. Klare;R. Fröhlich;M. Oestreich

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制备了一系列平面手性二茂铁基取代的氢硅烷作为二茂铁稳定的硅阳离子的前体。这些分子还具有在硅原子上的立体异构性。报道了相应硅阳离子的产生和(29)Si NMR谱表征,并讨论了缺电子硅原子与相邻的C(sp(3))-H键或芳香π给体相互作用所引起的问题。这些问题通过将硅原子上的另一个取代基拴系到二茂铁主链上来克服。所得到的环化也赋予构象刚性和空间位阻,以这样的方式,在硅原子的中心手性设置与完全的非对映体控制。然后在困难的Diels-Alder反应中测试这些手性刘易斯酸催化剂,但没有观察到对映体诱导。
The preparation of a series of planar chiral, ferrocenyl-substituted hydrosilanes as precursors of ferrocene-stabilized silicon cations is described. These molecules also feature stereogenicity at the silicon atom. The generation and (29)Si NMR spectroscopic characterization of the corresponding silicon cations is reported, and problems arising from interactions of the electron-deficient silicon atom and adjacent C(sp(3))-H bonds or aromatic π donors are discussed. These issues are overcome by tethering another substituent at the silicon atom to the ferrocene backbone. The resulting annulation also imparts conformational rigidity and steric hindrance in such a way that the central chirality at the silicon atom is set with complete diastereocontrol. These chiral Lewis acid catalysts were then tested in difficult Diels-Alder reactions, but no enantioinduction was seen.
DOI: 10.1002/chem.201302885
发表时间: 2013-12
期刊: Chemistry
影响因子: --
作者:
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