The manganese-catalyzed α-fluoroalkenylation of arenes via C–Hactivation and C–F cleavage has been described. This protocol provides a very useful method for the synthesis of monofluoroalkenes with predominant unconventional E-isomer selectivity which complements the existing strategies for the access to these molecular architectures. In addition, the selectivity of β-defluorination in the catalytic
reported. By taking advantage of the in situ generated α-CF3-benzylsilver intermediates derivedfrom the nucleophilic addition of silver fluoride to gem-difluoroalkenes, this strategy bypasses the use of a strong base, thus enabling a mild and general synthetic method for ready access to non-symmetric α,α-disubstituted trifluoroethane derivatives.
Nickel-Catalyzed Defluorinative Reductive Cross-Coupling of <i>gem</i>-Difluoroalkenes with Unactivated Secondary and Tertiary Alkyl Halides
作者:Xi Lu、Yan Wang、Ben Zhang、Jing-Jing Pi、Xiao-Xu Wang、Tian-Jun Gong、Bin Xiao、Yao Fu
DOI:10.1021/jacs.7b06469
日期:2017.9.13
Herein, we described a nickel-catalyzed monofluoroalkenylation through defluorinative reductive cross-coupling of gem-difluoroalkenes with alkyl halides. Key to the success of this strategy is the combination of C-F cleavage with alkyl halides activation. This reaction enables the convenient synthesis of a large variety of functionalized monofluoroalkenes under mild reaction conditions with broad functional
在此,我们描述了通过嵴二氟烯烃与烷基卤化物的脱氟还原交叉偶联实现的镍催化的单氟烯基化反应。该策略成功的关键是将 CF 裂解与烷基卤化物活化相结合。该反应能够在温和的反应条件下方便地合成多种官能化的单氟烯烃,具有广泛的官能团兼容性和优异的 Z 选择性。Ni 催化与 (Bpin)2/K3PO4 作为末端还原剂的结合促进了 C(sp2)-C(sp3) 的有效形成,尤其是具有高化学选择性的全碳四元中心的生成。
Radical Hydroboration and Hydrosilylation of <i>gem</i>-Difluoroalkenes: Synthesis of α-Difluorinated Alkylborons and Alkylsilanes
作者:Xiaozu Liu、E Emily Lin、Guojun Chen、Ji-Lin Li、Peijun Liu、Honggen Wang
DOI:10.1021/acs.orglett.9b03218
日期:2019.10.18
This protocol features good functional group tolerance, operational simplicity, high atom economy, and easy scale-up, enabling efficient assembly of a wide range of α-difluorinated alkylborons and alkylsilanes in moderate to excellent yields. The synthetic utility of these products is demonstrated by further transformation of the C–B bond and C–Si bond into valuable CF2-containing molecules.