在本研究中,我们报道了在 50 °C 下使用 Togni 试剂 II 作为三氟甲基化试剂,在 50 °C 下对富含电子的吲哚进行无催化剂直接 C H 三氟甲基化,以良好的收率提供所需的三氟甲基化化合物。此外,这种新方法被证明可用于生物活性分子褪黑激素和佐米曲普坦的三氟甲基化,表明其在后期三氟甲基化中的应用。
Direct C2-selective trifluoromethylation of indole derivatives was achieved with Togni's hypervalent iodine reagent and CuOAc as a catalyst in MeOH under mild conditions, affording the desired C2-trifluoromethylated indoles in good yield (up to 90%). (C) 2010 Elsevier Ltd. All rights reserved.
Rapid trifluoromethylation of indole derivatives was achieved using trimethylsilyltriflate as the catalyst. Good to high yields were observed within only 5 min at room temperature. This reaction system is able to provide not only the mono-trifluoromethylated products, but also the di-trifluoromethylated derivatives, because of its high reaction efficiency.