A Bench-Stable, Single-Component Precatalyst for Silyl–Heck Reactions
作者:Sarah B. Krause、Jesse R. McAtee、Glenn P. A. Yap、Donald A. Watson
DOI:10.1021/acs.orglett.7b02807
日期:2017.10.20
reaction aimed at identifying active palladium complexes have revealed a new species that is formed in situ. This complex has been identified as the palladium iodide dimer, [(JessePhos)PdI2]2, which has been found to be a competent single-component precatalyst for the silyl-Heck reaction. This complex is easily prepared and is temperature, moisture, and airstable. Additionally, this precatalyst provides
Selective synthesis of halosilanes from hydrosilanes and utilization for organic synthesis
作者:Atsutaka Kunai、Joji Ohshita
DOI:10.1016/s0022-328x(03)00254-7
日期:2003.11
Selective synthesis of halosilanes has been examined. Various types of halosilanes and halohydrosilanes, such as R3SiX, R2SiHX, R2SiX2, RSiH2X, RSiHX2 (X = Cl, Br, F), were obtained by the reactions of the corresponding hydrosilanes with Cu(II)-based reagents selectively in high yields. This method could be also applied to the synthesis of chlorofluorosilanes and chlorohydrogermanes. On the other hand, iodo- and bromosilanes and germanes were obtained by Pd- or Ni-catalyzed hydride-halogen exchange reactions of hydrosilanes with alkyl or allyl halides. Their synthetic applications have been demonstrated by using iodo-and bromosilanes and chlorofluorosilanes. (C) 2003 Elsevier Science B.V. All rights reserved.
Palladium-Catalyzed Cross-Coupling of Silyl Electrophiles with Alkylzinc Halides: A Silyl-Negishi Reaction
作者:Andrew P. Cinderella、Bojan Vulovic、Donald A. Watson
DOI:10.1021/jacs.7b04364
日期:2017.6.14
the first example of a silyl-Negishi reaction between secondary zinc organometallics and silicon electrophiles. This palladium-catalyzed process provides direct access to alkyl silanes. The delicate balance of steric and electronic parameters of the employed DrewPhos ligand is paramount to suppressing isomerization and promoting efficient and selective cross-coupling.
Electrolysis of iodosilanes with Al/Pt electrodes in pivalonitrile results in the formation of the Si–Si bonds to give the corresponding disilanes. On the other hand, the electrolysis of various halosilanes such as iodo-, chloro-, and fluorosilanes with Pt/Pt electrodes in the presence of phenylacetylene leads to the formation of the Si–sp-carbon bonds to give phenylethynylated products.