Silylzincation of carbon–carbon multiple bonds revisited
作者:Gertrud Auer、Martin Oestreich
DOI:10.1039/b513528a
日期:——
The first investigation of the copper-catalyzed silylzincation of alkynes as well as a diene and styrene using bis(triorganosilyl) zinc reagents led to the development of an efficient procedure and the disclosure of an unexpected bissilylation and unforeseen regioselectivity.
photocatalytic C–Si formation strategy has been disclosed by uncovering the reactivity of Martin’s spirosilane-derived pentacoordinate silylsilicates as silyl radicalprecursors. The hydrosilylation of a broad spectrum of alkenes and alkynes, as well as the C–H silylation of heteroarenes, has been demonstrated. Remarkably, Martin’s spirosilane was stable and could be recovered via a simple workup process
通过揭示 Martin 的螺硅烷衍生的五配位甲硅烷基硅酸盐作为甲硅烷基自由基前体的反应性,揭示了可见光诱导的光催化 C-Si 形成策略。已经证明了广谱烯烃和炔烃的氢化硅烷化,以及杂芳烃的 C-H 硅烷化。值得注意的是,Martin 的螺硅烷非常稳定,可以通过简单的后处理过程回收。此外,使用水作为溶剂或低能量绿色 LED 作为替代能源,反应进行得很好。
Decarboxylative Allylation of Silanecarboxylic Acids Enabled by Organophotocatalysis
allylsilanes, particularly from readily available allylsulfones and stable silanecarboxylic acids as silyl radical precursors. Further investigations reveal that this strategy is also generally compatible with vinyl sulfones to access vinylsilanes. The silver catalytic system opens up an alternative entry to realize the decarboxylative allylation of silanecarboxylic acids.
Some synthetic applications of vinylphosphane oxides
作者:Ana M. Gonzalez-Nogal、Purificacion Cuadrado、Maria A. Sarmentero
DOI:10.1016/j.tet.2010.10.016
日期:2010.12
Vinylphosphane oxides have been used as Michael acceptors for the diastereoselective synthesis of anti alpha-functionalized-beta-silylated phosphane oxides and beta-stannyl-, beta-phenylthio- or beta-phosphanyl phosphane oxides. Although the utility of these substrates as dipolarophiles was more limited, we have obtained a mixture of 3- and 4-phosphanylpyrazoles in which the latter is the major regioisomer, by 1,3-cycloaddition with N-phenylsydnone. Moreover, vinylphosphane oxides reacted with aldehydes in the presence of LDA by a Baylis-Hillman type reaction, leading to (E)-beta-hydroxyphosphane oxides, which were readily converted in allenes. It is noteworthy that the application of this methodology to silylated substrates has permitted us to synthesize an interesting and more versatile silylallene. (C) 2010 Elsevier Ltd. All rights reserved.
Barbero, Asuncion; Cuadrado, Purificacion; Fleming, Ian, Journal of the Chemical Society. Perkin transactions I, 1995, # 12, p. 1525 - 1532
作者:Barbero, Asuncion、Cuadrado, Purificacion、Fleming, Ian、Gonzalez, Ana M.、Pulido, Francisco、Sanchez, Alicia