Palladium-catalyzed insertion reactions of trimethylsilyldiazomethane
作者:Kevin L Greenman、David S Carter、David L Van Vranken
DOI:10.1016/s0040-4020(01)00363-5
日期:2001.6
Palladium(II) salts catalyze the Kirmse reaction of allylsulfides with trimethylsilyldiazomethane (TMSD) to give homoallylsulfides. Similarly, TMSD can intercept ArPdX intermediates generated during Stille couplings to give benzhydryl derivatives. The yields of this process are limited by overinsertion and β-elimination. Insertion and elimination can be harnessed to generate styrenes from benzylic
Metal-free synthesis of <i>gem</i>-silylboronate esters and their Pd(0)-catalyzed cross-coupling with aryliodides
作者:Chaoqiang Wu、Zhicheng Bao、Xing Xu、Jianbo Wang
DOI:10.1039/c9ob01006h
日期:——
transformation is a straightforward homologation of arylboronic acids and features wide substrate scope and good functional-group tolerance. The gem-silylboronate esters undergo efficient Suzuki-Miyaura cross-coupling with aryliodides and the silyl group of the product can be further functionalized. Tertiary carbon centers with different substituents can be constructed successfully by selective and sequential
Silylcarbonium ions from the reaction of silylcarbinols with boron trifluoride
作者:A. G. Brook、K. H. Pannell
DOI:10.1139/v70-617
日期:1970.12.1
The behavior of silylcarbonium ions, Si—C+, generated from various types of α-silylcarbinol with borontrifluoride under a variety of conditions of temperature and solvent has been examined. Four distinct types of reaction have been observed, depending on the conditions and the structure of the carbinol. These are: 1,2-migration of aryl groups from silicon to carbon, yielding a fluorosilane; Friedel–Crafts
Chemoselective Three‐Component Geminal Cross Couplings of Dihaloalkanes with Cr Catalysis: Rapid Access to Tertiary and Quaternary Alkanes via a Metal–Carbene Intermediate
The three-component geminal couplings have been achieved by design of a chromium catalytic system using dihaloalkanes to selective react with organomagnesium and chlorosilanes/alkyl tosylates. These newly developed reactions are effective for rapidly forming tertiary and quaternary alkanes via a Cr carbene intermediate with a novel inner-sphere radical coupling mechanism, showing great potential in