Pd
<sup>0</sup>
‐Mediated Cross‐Coupling of [
<sup>11</sup>
C]Methyl Iodide with Carboxysilane for Synthesis of [
<sup>11</sup>
C]Acetic Acid and its Active Esters:
<sup>11</sup>
C‐Acetylation of Small, Medium, and Large Molecules
作者:Hisashi Doi、Miki Goto、Yuzuru Sato
DOI:10.1002/ejoc.202100638
日期:2021.8.6
A synthetic method for the preparation of radioactive [11C]aceticacid and its active esters starting from [11C]CH3I is reported. The Pd-mediated cross-coupling of [11C]CH3I with triphenylcarboxysilane gave [2-11C]aceticacid in a high yield. [2-11C]aceticacid was rapidly converted into [2-11C]aceticacid imidyl esters, which are useful for the radiolabeling via 11C-acetylation of organic molecules
Regular paperCarbanion mechanisms XX. Is there charge delocalization in phenyl-substituted group 4 anions? Evidence from electronic absorption spectroscopy
作者:E Buncel
DOI:10.1016/0022-328x(95)05770-p
日期:1996.1.25
From the electronic absorption spectra of the triphenyl silyl, germyl, stannyl and plumbyl anions Ph3E− (ESi, Ge, Sn or Pb), it is concluded that there exists in these species almost no conjugation between the Group 4 element and the phenyl group substituents, contrasting with the Ph3C− carbanion. A similar conclusion can be drawn from the near constancy of λmax values in the series Ph3Si−, Ph2SiH−
Visible-light-induced decarboxylation/defluorosilylation protocol for synthesis of <i>gem</i>-difluoroalkenes
作者:Pan Gao、Liping Cui、Guodong Zhang、Feng Chen
DOI:10.1039/d2cy01703b
日期:——
A catalytic defluorosilylation is disclosed that provides concise, modular synthetic entries to gem-difluoroallylsilanes from trifluoromethylalkenes and silacarboxylic acids, which are easy-to-prepare and stable silyl radical precursors. It is enabled by photoredox catalysis and undergoes a unique decarboxylation followed by defluorosilylation without extra hydrogen atom transfer catalysis. This efficient
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.
Palladium-Catalyzed Carbonylative Hiyama–Denmark Reaction toward the Synthesis of Aryl Carbonyl-Containing Oxindoles
作者:Xiong Li、Xuemei Zhang、Baojian Xiong、Zhong Lian
DOI:10.1021/acs.joc.2c02479
日期:——
A palladium-catalyzed domino Heck cyclization/carbonylative Hiyama–Denmark cross-coupling reaction between alkene-tethered aryl iodides and silylcarboxylic acids is presented. This reaction proceeds well without toxic carbon monoxide (CO) gas and has good functional group tolerance, providing an alternative access to carbonyl-containing oxindoles. In this transformation, silylcarboxylic acids play
提出了一种钯催化的多米诺 Heck 环化/羰基化 Hiyama-Denmark 烯烃系芳基碘化物和甲硅烷基羧酸之间的交叉偶联反应。该反应在没有有毒一氧化碳 (CO) 气体的情况下进行得很好,并且具有良好的官能团耐受性,为含羰基羟吲哚提供了另一种途径。在这种转化中,甲硅烷基羧酸作为 CO 源和亲核试剂发挥双重作用。