Pd‐Catalyzed C−H Alkylation of Arenes Using PyrDipSi, a Transformable and Removable Silicon‐Tethered Directing Group
作者:Dhruba Sarkar、Vladimir Gevorgyan
DOI:10.1002/chem.201602513
日期:2016.8
Pd‐catalyzed ortho‐C−H alkylation reaction of arenes using a transformable and removable Si‐tethered pyridyldiisopropylsilyl (PyrDipSi) directinggroup has been developed. In addition, the PyrDipSi directinggroup allows for an efficient sequential double‐fold C−H alkylation/oxygenation of arenes to produce meta‐alkylated phenols. This directinggroup can easily be removed or converted into valuable functionalities
PyDipSi: A General and Easily Modifiable/Traceless Si-Tethered Directing Group for C−H Acyloxylation of Arenes
作者:Natalia Chernyak、Alexander S. Dudnik、Chunhui Huang、Vladimir Gevorgyan
DOI:10.1021/ja1033167
日期:2010.6.23
A new general and easily installable silicon-tethered pyridyl-containing directing group (PyDipSi) that allows for highly efficient and regioselective Pd-catalyzed ortho C-H acyloxylation of arenes has been developed. It has also been demonstrated that this directing group can efficiently be removed as well as converted into a variety of other valuable functional groups. In addition, the installation of the PyDipSi directing group along with pivaloxylation and quantitative conversion of the PyDipSi group into a halogen functionality represents a formal three-step ortho oxygenation of haloarenes.
Alkali Metal-Hydroxide-Catalyzed C(<i>sp</i>)–H Bond silylation
作者:Anton A. Toutov、Kerry N. Betz、David P. Schuman、Wen-Bo Liu、Alexey Fedorov、Brian M. Stoltz、Robert H. Grubbs
DOI:10.1021/jacs.6b12114
日期:2017.2.1
Disclosed is a mild, scalable, and chemoselective catalytic cross-dehydrogenative C-H bond functionalization protocol for the construction of C(sp)-Si bonds in a single step. The scope of the alkyne and hydrosilane partners is substantial, providing an entry point into various organosilane building blocks and additionally enabling the discovery of a number of novel synthetic strategies. Remarkably, the optimal catalysts are NaOH and KOH.