From C
<sub>1</sub>
to C
<sub>2</sub>
: TMSCF
<sub>3</sub>
as a Precursor for Pentafluoroethylation
作者:Qiqiang Xie、Lingchun Li、Ziyue Zhu、Rongyi Zhang、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.201807873
日期:2018.10
A highly efficient copper‐mediated aromatic pentafluoroethylation method using TMSCF3 as the sole fluoroalkyl source is described. The reaction proceeds by a key C1 to C2 process, that is, the generation of CuCF3 from TMSCF3, followed by a subsequent spontaneous transformation into CuC2F5. Various aryl iodides were pentafluoroethylated with the TMSCF3‐derived CuC2F5. This method represents the first
Cu<sup>I</sup>
-Catalyzed Pentafluoroethylation of Aryl Iodides in the Presence of Tetrafluoroethylene and Cesium Fluoride: Determining the Route to the Key Pentafluoroethyl Cu<sup>I</sup>
Intermediate
The Cu(I)‐catalyzed pentafluoroethylation of iodoarenes via the fluorocupration of tetrafluoroethylene (TFE) is disclosed. The active species, (phen)CuC2F5, was isolated and its molecular structure confirmed by a single‐crystal X‐ray diffraction analysis. The key to the successful suppression of the competing oligomerization of TFE is to refrain from stirring the reaction mixture. A mechanistic study
公开了通过四氟乙烯(TFE)的氟代杯化反应,由铜(I)催化的碘代芳烃的五氟乙基化。分离了活性物质(phen)CuC 2 F 5,并通过单晶X射线衍射分析确认了其分子结构。成功抑制TFE竞争性低聚的关键是避免搅拌反应混合物。机理研究清楚地放弃了催化反应通过自由基途径进行的可能性。
“Ligandless” Pentafluoroethylation of Unactivated (Hetero)aryl and Alkenyl Halides Enabled by the Controlled Self-Condensation of TMSCF<sub>3</sub>-Derived CuCF<sub>3</sub>
作者:Jordi Mestre、Sergio Castillón、Omar Boutureira
DOI:10.1021/acs.joc.9b02001
日期:2019.12.6
Pentafluoroethylation of unactivated C(sp2)-X bonds (X = I, Br) using a storable, "ligandless" CuC2F5 reagent prepared by controlled self-condensation of ready available TMSCF3-derived CuCF3 has been developed. A thorough analysis by 19F NMR and ESI-MS revealed the nature of this reagent in solution. The operational simplicity and robustness of this system enables the efficient, late-stage incorporation
已经开发出了一种可活化的,“无配体的” Cu 试剂对未活化的C(sp2)-X键(X = I,Br)进行五氟乙基化,该试剂通过可控的自发TMSCF3衍生的CuCF3的自缩合制备。通过19 F NMR和ESI-MS进行的彻底分析揭示了该试剂在溶液中的性质。该系统的操作简单性和鲁棒性使C2F5单元可以高效,后期地并入各种(杂)芳基和复杂的烯基卤化物(如糖基,核苷和核碱基)中。