Metal-free <sup>18</sup>F-labeling of aryl-CF<sub>2</sub>H via nucleophilic radiofluorination and oxidative C–H activation
作者:Gengyang Yuan、Feng Wang、Nickeisha A. Stephenson、Lu Wang、Benjamin H. Rotstein、Neil Vasdev、Pingping Tang、Steven H. Liang
DOI:10.1039/c6cc07913j
日期:——
A metal-free and selective method to form [18F]aryl-CF2H through nucleophilic radiofluorination of benzyl (pseudo)halides and oxidative C-H activation of benzylic C-H bonds has been developed.
Nucleophilic (Radio)Fluorination of Redox-Active Esters via Radical-Polar Crossover Enabled by Photoredox Catalysis
作者:Eric W. Webb、John B. Park、Erin L. Cole、David J. Donnelly、Samuel J. Bonacorsi、William R. Ewing、Abigail G. Doyle
DOI:10.1021/jacs.0c03125
日期:2020.5.20
redox-neutral method for nucleophilicfluorination of N-hydroxyphthalimide esters using an Ir photocatalyst under visible light irradiation. The method provides access to a broad range of aliphatic fluorides, including primary, secondary, and tertiary benzylic fluorides as well as unactivated tertiary fluorides, that are typically inaccessible by nucleophilicfluorination due to competing elimination
我们报告了在可见光照射下使用 Ir 光催化剂对 N-羟基邻苯二甲酰亚胺酯进行亲核氟化的氧化还原中性方法。该方法提供了获得广泛的脂肪族氟化物的途径,包括伯、仲和叔苄基氟化物以及未活化的叔氟化物,由于竞争消除,这些氟化物通常无法通过亲核氟化获得。此外,我们表明脱羧氟化条件很容易适应 [18F]KF 的放射性氟化。我们建议反应通过 Ir 催化剂和氧化还原活性酯底物之间的两次电子转移进行,以提供碳阳离子中间体,随后被氟化物捕获。
Efficient and Selective Halogenation of Allylic and Benzylic Alcohols under Mild Conditions
作者:Babasaheb P. Bandgar、Sampada V. Bettigeri
DOI:10.1007/s00706-004-0212-8
日期:2004.10
A simple, mild, and high yielding procedure for the halogenation of allylic and benzylic alcohols using a combination of SOCl2, benzotriazole, and potassium halides in DMF is described. The effectiveness of the protocol is manifested in its selectivity towards allylic and benzylic alcohols whereas other simple alcohols such as primary, secondary, and tertiary are found to be unreactive.