Silver-Catalyzed Oxidative Activation of Benzylic CH Bonds for the Synthesis of Difluoromethylated Arenes
作者:Peng Xu、Shuo Guo、Liyan Wang、Pingping Tang
DOI:10.1002/anie.201400225
日期:2014.6.2
A mild and catalytic method to form difluoromethylated arenes through the activation of benzylic CHbonds has been developed. Utilizing AgNO3 as the catalyst, various arenes with diverse functional groups undergo activation/fluorination of benzylic CHbonds with commercially available Selectfluor reagent as a source of fluorine in aqueous solution. The reaction is operationally simple and amenable
Iron‐Catalyzed Fluoroalkylation of Arylborates with Sulfone Reagents: Beyond the Limitation of Reduction Potential
作者:Zhiqiang Wei、Wenjun Miao、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.202102597
日期:2021.6.7
alkyl–aryl coupling reaction between sulfones and arylboron compounds has remained a challenge. We report the first iron-catalyzed radical difluoroalkylation of arylborates with N-heteroaryl sulfones. The coordination between the iron catalyst and the nitrogen atom of N-heteroaryl sulfones was identified to be important in overcoming the reductionpotentiallimitation of sulfones in the intermolecular single-electron-transfer
source in the synthesis of valuable compounds. Here, we report a novel selective carboxylation of C(sp3)−F bonds with CO2 via visible-light photoredox catalysis. A variety of mono-, di-, and trifluoroalkylarenes as well as α,α-difluorocarboxylic esters and amides undergo such reactions to give important aryl acetic acids and α-fluorocarboxylic acids, including several drugs and analogs, under mild conditions
在有价值的化合物的合成中,利用二氧化碳 (CO 2 ) 作为一种无毒且可持续的 C1 来源,因其惰性而极具吸引力和挑战性。在这里,我们报告了 C(sp 3 )-F 键与 CO 2通过可见光光氧化还原催化的新型选择性羧化。各种单、二和三氟烷基芳烃以及 α,α-二氟羧酸酯和酰胺在温和条件下进行此类反应,生成重要的芳基乙酸和 α-氟羧酸,包括几种药物和类似物。值得注意的是,机械研究和 DFT 计算证明了 CO 2的双重作用在这种转变过程中作为电子载体和亲电子试剂。氟化底物将通过富电子的 CO 2自由基阴离子进行单电子还原,这些阴离子是通过连续的氢化物转移还原和氢原子转移过程从 CO 2原位生成的。我们预计我们的发现将成为使用惰性底物(包括木质素和其他生物质)进行更具挑战性的 CO 2利用率的起点。
ONE POT SYNTHESIS OF 18F LABELEDTRIFLUOROMETHYLATED COMPOUNDS WITH DIFLUORO(IODO)METHANE
申请人:University of Oslo
公开号:US20150239796A1
公开(公告)日:2015-08-27
The present invention relates to compositions and methods for the synthesis of
18
F labeled compounds. In particular, the present invention relates to a copper (I) mediated one pot method for
18
F-trifluoromethylation of aromatic- or heteroaromatic halides with difluoro(iodo)methane (e.g., for use at PET imaging agents).
the direct conversion of benzylicC-H groups to C-F. We show that visible light can activate diarylketones to abstract a benzylic hydrogen atom selectively. Adding a fluorine radical donor yields the benzylicfluoride and regenerates the catalyst. The selective formation of mono- and difluorination products can be achieved by catalyst control. 9-Fluorenone catalyzes benzylicC-H monofluorination, while