Reductive Electrophotocatalysis: Merging Electricity and Light To Achieve Extreme Reduction Potentials
作者:Hyunwoo Kim、Hyungjun Kim、Tristan H. Lambert、Song Lin
DOI:10.1021/jacs.9b10678
日期:2020.2.5
strategy that harnesses the power of light and electricity to generate an excited radical anion with a reducing potential of -3.2 V vs SCE, which can be used to activate substrates with very high reductionpotentials (Ered ≈ -1.9 to -2.9 V). The resultant aryl radicals can be engaged in various synthetically useful transformations to furnish arylboronate, arylstannane, and biaryl products.
我们描述了一种新的电光催化策略,该策略利用光和电的力量产生还原电位为 -3.2 V vs SCE 的激发自由基阴离子,可用于激活具有非常高还原电位(Ered ≈ -1.9 至 - 2.9 伏)。所得芳基可参与各种合成有用的转化,以提供芳基硼酸酯、芳基锡烷和联芳基产物。
Synthesis of Aryl Trimethylstannane via BF<sub>3</sub>·OEt<sub>2</sub>-Mediated Cross-Coupling of Hexaalkyl Distannane Reagent with Aryl Triazene at Room Temperature
BF3·OEt2-mediated cross-coupling of (SnMe3)2 with aryl triazene offers a new strategy for the synthesis of aryl stannane. A variety of synthetically useful aryl trimethylstannanes were produced in moderate to good yields with this metal-free approach. One-pot sequential Stille cross-coupling with different aryl bromides provides a short entry to both symmetrical and unsymmetrical biaryl compounds.
Synthesis of Aryl Trimethylstannanes from Aryl Amines: A Sandmeyer-Type Stannylation Reaction
作者:Di Qiu、He Meng、Liang Jin、Shuai Wang、Shengbo Tang、Xi Wang、Fanyang Mo、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201304579
日期:2013.10.25
Sandmeyer‐type stannylation: Stille coupling is one of the most powerful coupling reactions for CC bond formation, whereas there are only limited methods to access aryl stannane compounds. A mild stannylation process based on a Sandmeyer‐type transformation using aromatic amines as the starting materials is described. DCE: 1,2‐dichloroethane.
Copper-Mediated Radiofluorination of Arylstannanes with [<sup>18</sup>F]KF
作者:Katarina J. Makaravage、Allen F. Brooks、Andrew V. Mossine、Melanie S. Sanford、Peter J. H. Scott
DOI:10.1021/acs.orglett.6b02911
日期:2016.10.21
A copper-mediated nucleophilic radiofluorination of aryl- and vinylstannanes with [18F]KF is described. This method is fast, uses commercially available reagents, and is compatible with both electron-rich and electron-deficient arene substrates. This method has been applied to the manual synthesis of a variety of clinically relevant radiotracers including protected [18F]F-phenylalanine and [18F]F-DOPA
The addition of aryl- or alkenyl-trimethylstannanes to α,β-unsaturated carbonylcompounds in the presence of a catalytic amount of a cationic rhodium complex ([Rh(cod)(MeCN)2]BF4) and water to afford the conjugateaddition products in good yields was examined. It was observed that addition of water was necessary for the reaction to proceed smoothly. The aryl- or alkenyl-rhodium complex, which is generated