Copper(I)-Catalyzed Alkylation of Polyfluoroarenes through Direct CH Bond Functionalization
作者:Shuai Xu、Guojiao Wu、Fei Ye、Xi Wang、Huan Li、Xia Zhao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201412450
日期:2015.4.7
The copper(I)‐catalyzed alkylation of electron‐deficient polyfluoroarenes with N‐tosylhydrazones and diazo compounds has been developed. This reaction uses readily available starting materials and is operationally simple, thus representing a practical method for the construction of C(sp2)C(sp3) bonds with polyfluoroarenesthroughdirectCHbondfunctionalization. Mechanistically, copper(I) carbene
Use of Trifluoromethyl Groups for Catalytic Benzylation and Alkylation with Subsequent Hydrodefluorination
作者:Jiangtao Zhu、Manuel Pérez、Christopher B. Caputo、Douglas W. Stephan
DOI:10.1002/anie.201510494
日期:2016.1.22
The electrophilic organofluorophosphonium catalyst [(C6F5)3PF][B(C6F5)4] is shown to effect benzylation or alkylation by aryl and alkyl CF3 groups with subsequenthydrodefluorination, thus resulting in a net transformation of CF3 into CH2–aryl fragments. In the case of alkyl CF3 groups, Friedel–Crafts alkylation by the difluorocarbocation proceeded without cation rearrangement, in contrast to the corresponding
亲电子性有机氟phosph催化剂[(C 6 F 5)3 PF] [B(C 6 F 5)4 ]显示出通过芳基和烷基CF 3基团进行苄基化或烷基化,随后进行加氢脱氟,从而导致CF的净转化3成CH 2-芳基片段。在烷基CF 3基团的情况下,与烷基单氟化物的相应反应相反,通过二氟碳羰基化进行的Friedel-Crafts烷基化反应没有阳离子重排。
Photo-Ni-Dual-Catalytic C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cross-Coupling Reactions with Mesoporous Graphitic Carbon Nitride as a Heterogeneous Organic Semiconductor Photocatalyst
作者:Jagadish Khamrai、Indrajit Ghosh、Aleksandr Savateev、Markus Antonietti、Burkhard König
DOI:10.1021/acscatal.9b05598
日期:2020.3.20
nitride (mpg-CN) and a homogeneous nickel catalyst with visible-light irradiation at room temperature affords the C(sp2)–C(sp3) cross-coupling of aryl halides and potassium alkyl trifluoroborates by single electron transmetallation. Like the homogeneously catalyzed protocol, the reaction is compatible with a variety of functional groups including electron-donating and electron-withdrawing aryl and heteroaryl
Synthesis of low-valent uranium fluorides by C–F bond activation
作者:Christopher L. Clark、Jill J. Lockhart、Phillip E. Fanwick、Suzanne C. Bart
DOI:10.1039/c5cc05049a
日期:——
The uranium(iii) alkyl, Tp*2UCH2Ph (Tp* = hydrotris(3,5-dimethylpyrazolyl)borate), activates C–F bonds on a variety of fluorinated substrates, generating Tp*2UF or Tp*2UF2.
Directing group and transitionmetalfree C–H bond functionalization of a simple molecule is an ideal but challenging chemical transformation. Herein, we report a general Mg-prompted approach to synthesize versatile polyfluoroaryl carbinols at ambient temperature viapolyfluoroarene C–H bond addition to aldehydes, which featured excellent monoaddition selectivity and broad functional group compatibility