A Tethered Ru-S Complex with an Axial Chiral Thiolate Ligand for Cooperative Si-H Bond Activation: Application to Enantioselective Imine Reduction.

A Tethered Ru-S Complex with an Axial Chiral Thiolate Ligand for Cooperative Si-H Bond Activation: Application to Enantioselective Imine Reduction.
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具有轴向手性硫醇盐配体的束缚 Ru-S 络合物,用于协同 Si-H 键活化:在对映选择性亚胺还原中的应用

DOI:
10.1002/chem.201700304
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发表时间:
2017
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:
S. Wübbolt;M. S. Maji;E. Irran;M. Oestreich

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An axial chiral version of the 2,6‐dimesitylphenyl group attached to sulfur is reported. Its multistep preparation starts from (S)‐binol, and the thiol group is established by a racemization‐free thermal Newman–Kwart rearrangement. The new chiral thiolate ligand decorated with one mesityl group is used in the synthesis of a tethered ruthenium chloride complex. Its spectroscopic characterization revealed solvent‐dependent epimerization at the ruthenium center. The major diastereomer is crystallographically characterized. Chloride abstraction with tetrakis[3,5‐bis(trifluoromethyl)phenyl]borate (NaBArF4) yields the corresponding coordinatively unsaturated ruthenium complex with the Ru−S bond exposed. Si−H bond activation at this Ru−S bond proceeds insynfashion but with moderate facial selectivity (d.r.=70:30), generating diastereomeric chiral‐at‐ruthenium hydrosilane adducts. Their application to catalytic imine hydrosilylation led to promising enantioinduction (40 %ee), thereby providing proof of concept for asymmetric catalysis involving cooperative Si−H bond activation.
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