Regiocontrol in the cobalt-catalyzed hydrosilylation of alkynes
作者:Guojiao Wu、Uttam Chakraborty、Axel Jacobi von Wangelin
DOI:10.1039/c8cc07267a
日期:——
A highly versatile cobalt-catalyzed hydrosilylations of alkynes is reported. Near-perfect regiocontrol/stereocontrol was induced by the choice of the ligand: bidentate phosphines afforded (E)-β-vinylsilanes; α-vinylsilanes formed with bipyridine ligands.
A Co(acac)2/POL‐Xantphos@10PPh3‐catalyzed hydrosilylation of unsymmetrical internal alkynes with Ph2SiH2 has been developed for the synthesis of highly selective syn‐α‐vinylsilane products. Furthermore, terminal alkynes were also used and gave the products with excellent regioselectivity and a wide functional group tolerance. Because this porous organic polymer combines the selectivity and activity
A Qualitative Examination of the Effects of Silicon Substituents on the Efficiency of Cross-Coupling Reactions
作者:Scott E. Denmark、Luc Neuville、Matthew E. L. Christy、Steven A. Tymonko
DOI:10.1021/jo061481t
日期:2006.10.1
the silicon atom in cross-coupling reactions of alkenylsilanes has been carried out. In intermolecular competition experiments, the influence of carbon-based groups (methyl, ethyl, isopropyl, tert-butyl, phenyl, and 3,3,3-trifluoropropyl) and alkoxy groups (monoethoxydimethyl-, diethoxymethyl-, and triethoxy) on the silicon have been evaluated under activation by two different methods, fluoride (TBAF)
[GRAPHICS]The titanium catalyst, which was generated in situ from titanocene dichloride and 2 equiv of butyllithium, was found to catalyze hydrosilation of a variety of alkynes with excellent regio- and syn-selectivity.