Catalytic 1,4-addition of arylsiloxanes to enones was carried out at 75 °C in the presence of a dicationicpalladium(II) catalyst in aqueous 1,4-dioxane. A nitrile-free complex generated in situ from Pd(dba)2 and Cu(BF4)2 in the presence of dppe or dppben was recognized to be the best catalyst to achieve high yields for the representative enones and enals.
Pd-catalyzed desulfitative Hiyama coupling with sulfonyl chlorides
作者:Wei Zhang、Fang Liu、Ke Li、Baoli Zhao
DOI:10.1002/aoc.3139
日期:2014.5
Palladium‐catalyzed desulfitativeHiyama cross‐coupling reactions of various arylsulfonyl chlorides with aryltriethoxysilane have been achieved in good yields. The reported cross‐coupling reactions are tolerant to the common functional groups regardless of electron‐withdrawing or electron‐donating, making these transformations attractive alternatives to the traditional cross‐coupling approaches. Copyright
We describe herein a regioselective palladium(II)-catalyzedintermolecularhydroarylation of unactivated aliphatic alkenes with electronically and sterically diverse (hetero)arylsilanes under redox-neutral conditions. A removable bidentate 8-aminoquinoline auxiliary was readily employed to dictate the regioselectivity, prevent β-hydride elimination, and facilitate protodepalladation. This silicon-based
A copper-catalyzed C–N bond forming reaction among aryl siloxane and primary, secondary amines as well as amides has been described. The reaction was conducted in the presence of P(C6F5)3 and 4 Å molecular sieves in CH2Cl2 at room temperature under O2. A catalytic amount of TBAF was employed to activate aryl siloxanes.
Improved Synthesis of Aryltrialkoxysilanes via Treatment of Aryl Grignard or Lithium Reagents with Tetraalkyl Orthosilicates
作者:Amy S. Manoso、Chuljin Ahn、Arash Soheili、Christopher J. Handy、Reuben Correia、W. Michael Seganish、Philip DeShong
DOI:10.1021/jo048667h
日期:2004.11.1
General reaction conditions for the synthesis of aryl(trialkoxy)silanes from aryl Grignard and lithium reagents and tetraalkyl orthosilicates (Si(OR)4) have been developed. Ortho-, meta-, and para-substituted bromoarenes underwent efficient metalation and silylation at low temperature to provide aryl siloxanes. Mixed results were obtained with heteroaromatic substrates: 3-bromothiophene, 3-bromo-4-methoxypyridine