Thiourea‐Catalyzed C−F Bond Activation: Amination of Benzylic Fluorides
作者:Camille Houle、Paul R. Savoie、Clotilde Davies、Damien Jardel、Pier Alexandre Champagne、Brigitte Bibal、Jean‐François Paquin
DOI:10.1002/chem.202001905
日期:2020.8.17
thiourea catalyst and Ti(OiPr)4 as a fluoride scavenger allows the amination of benzylic fluorides to proceed in moderate to excellent yields. Preliminary results with S‐ and O‐based nucleophiles are also presented. DFT calculations reveal the importance of hydrogen bonds between the catalyst and the fluorineatom of the substrate to lower the activation energy during the transition state.
我们描述了第一个硫脲催化的CF键活化。使用硫脲催化剂和Ti(O i Pr)4作为氟化物清除剂可使苄基氟化物的胺化反应以中等至极好的收率进行。还介绍了基于S和O的亲核试剂的初步结果。DFT计算揭示了催化剂和底物氟原子之间氢键对于降低过渡态活化能的重要性。
Palladium-Catalyzed <i>Para</i>-C–H Bond Amination of 2-Aryl Chloromethylbenzenes
作者:Yingqi Wang、Sheng Zhang、Xiujuan Feng、Xiaoqiang Yu、Masahiko Yamaguchi、Ming Bao
DOI:10.1021/acs.joc.2c01233
日期:2022.8.5
Palladium-catalyzed para-C–H bond amination of 2-aryl chloromethylbenzenes is described for the first time. The reactions of 2-aryl chloromethylbenzenes with cyclic amines proceeded smoothly in the presence of Pd(acac)2, tri(2-furyl)phosphine, and NaH in tetrahydrofuran at 40 °C to provide para-C–H bond aminated products in satisfactory to high yields with acceptable regioselectivity in most cases