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。
utilization of decomposition products of PFECAs. We report herein a new series of deoxyfluorination reagents featuring OCF2 functional groups derived from certain PFECAs. Alkyl fluorides were generated from various alcohols in ≤97% yield by these novelreagents. The mechanistic experiment verified in situgeneration of carbonic difluoride (COF2).
Tetramethylfluoroformamidinium Hexafluorophosphate (TFFH) as a Mild Deoxofluorination Reagent
作者:Pascal Dubé、Gabriel Bellavance、Bao Nguyen
DOI:10.1055/s-0031-1290336
日期:2012.3
air-stable peptide coupling reagent TFFH (tetramethylfluoroformamidinium hexafluorophosphate) was found to activate a variety of alcohols towards deoxofluorination. These conditions are compatible with carbonyl functional groups thus offering interesting possibilities for the application to sensitive molecules. deoxofluorination - fluoroformamidinium -fluoride- TFFH -fluorination
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
Direct photocatalytic fluorination of benzylic C–H bonds with N-fluorobenzenesulfonimide
作者:Matthew B. Nodwell、Abhimanyu Bagai、Shira D. Halperin、Rainer E. Martin、Henner Knust、Robert Britton
DOI:10.1039/c5cc04058b
日期:——
Two complimentary strategies for the directfluorination of benzylic C-H bonds with NFSI are described using either AIBN-initiation or decatungstate photocatalysis.
benzene derivative with CsSO4F has been modulated by substituents on the benzene ring. α-Hydroxyalkylbenzenes, with a deactivated ring, were oxidized to phenones, while fluorodealkylation was achieved in high yield when electron-donating groups were present in a para position. Electron-withdrawing substituents favoured chain fluorofunctionalization in alkylbenzenes, while ring fluorination was found