Refinement of the Catalyst Backbone of Chiral Intramolecular Silicon–Sulfur Lewis Pairs: Improved Enantioselectivity in the Diels–Alder Reaction of Cyclohexa‐1,3‐diene and Chalcone Derivatives

Refinement of the Catalyst Backbone of Chiral Intramolecular Silicon–Sulfur Lewis Pairs: Improved Enantioselectivity in the Diels–Alder Reaction of Cyclohexa‐1,3‐diene and Chalcone Derivatives
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手性分子内硅-硫路易斯对催化剂主链的精制:提高环己-1,3-二烯和查尔酮衍生物的第尔斯-阿尔德反应中的对映选择性

DOI:
10.1002/ejoc.201800434
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发表时间:
2018
影响因子:
2.8
通讯作者:
M. Oestreich
M. Oestreich
中科院分区:
化学3区
文献类型:
--
作者:
P. Shaykhutdinova;S. Kemper;M. Oestreich

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报道了一类轴向手性硫稳定硅阳离子的制备及其核磁共振表征。这些硅路易斯酸已被用作催化剂,用于环己- 1,3 -二烯和代表性查尔酮衍生物的难对映选择性Diels-Alder反应。为了更好地了解这些催化剂的相关结构元素,对其硅平主链和芳基硫醚基进行了系统的修饰。这些努力导致了一种改进的催化剂,对查尔酮产生53%的电导率,对更受阻的衍生物产生65%的电导率。这些环己- 1,3 -二烯Diels-Alder反应是内选择性的。然而,相应的环戊二烯Diels-Alder反应主要产生外环加合物,没有对映体诱导。
The preparation and NMR spectroscopic characterization of a family of axial chiral, sulfur‐stabilized silicon cations is reported. These silicon Lewis acids have been applied as catalysts in difficult enantioselective Diels–Alder reactions of cyclohexa‐1,3‐diene and representative chalcone derivatives. To gain better understanding of the relevant structural elements in these catalysts, their silepine backbone and the aryl thioether group have been systematically modified. These efforts have led to an improved catalyst that induces 53 %eefor chalcone and even 65 %eefor a more hindered derivative. These cyclohexa‐1,3‐diene Diels–Alder reactions areendoselective. However, the corresponding cyclopentadiene Diels–Alder reactions predominantly yield theexocycloadducts with no enantioinduction.
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发表时间: 2009-02-11
影响因子: 15
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