Intramolecularly Sulfur-Stabilized Silicon Cations with Chiral Binaphthyl Backbones: Synthesis of Three Different Motifs and Their Application in Enantioselective Diels–Alder Reactions
Intramolecularly Sulfur-Stabilized Silicon Cations with Chiral Binaphthyl Backbones: Synthesis of Three Different Motifs and Their Application in Enantioselective Diels–Alder Reactions
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具有手性联萘基主链的分子内硫稳定的硅阳离子:三种不同基序的合成及其在对映选择性狄尔斯-阿尔德反应中的应用
DOI:
10.1021/acs.organomet.5b00351
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发表时间:
2015
期刊:
影响因子:
2.8
通讯作者:
M. Oestreich
中科院分区:
文献类型:
--
作者:
Volker H. G. Rohde;M. Müller;M. Oestreich
The formation and 29Si NMR spectroscopic characterization of silicon cations that are intramolecularly stabilized by a dialkyl thioether are described. The chemical stability of the silicon–sulfur Lewis pair and, hence, the viability of the approach, were probed with a 2-[(alkylthio)methyl]phenyl-substituted hydrosilane as a proxy before three different motifs with chiral binaphthyl backbones were prepared in multistep sequences. The degree of shielding of the silicon atom in these cations was found to depend on the substitution pattern at the silicon atom and the ring size generated by the silicon–sulfur interaction. These sulfur-stabilized silicon cations are sufficiently reactive to promote Diels–Alder reactions of cyclohexa-1,3-diene with various dienophiles; the same set of reactions with cyclopentadiene is also reported. One of the three chiral Lewis acids induces low, but promising, enantioselectivity, and 24% ee is the highest value so far obtained with a cationic tetracoordinate silicon catalyst.
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影响因子:
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通讯作者:
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