Enantioselective Copper-Catalyzed Trifluoromethylation of Benzylic Radicals via Ring Opening of Cyclopropanols
作者:Chao Jiang、Lei Wang、Honggang Zhang、Pinhong Chen、Yin-Long Guo、Guosheng Liu
DOI:10.1016/j.chempr.2020.07.003
日期:2020.9
trifluoromethylation of aryl-substituted cyclopropanols via a radical ring-opening pathway is reported herein, which provides an easy and straightforward access to structurally diverse β-CF3 ketones in good yields and excellent enantioselectivities under very mild conditions. Critical to the success of the copper-catalyzed radical relay is that a benzylic radical intermediate can be enantioselectively trapped by
本文报道了经由自由基开环途径的芳基取代的环丙醇的不对称三氟甲基化,其提供了在非常温和的条件下容易且直接地以良好的产率和优异的对映选择性接近结构多样的β- CF 3酮。铜催化自由基继电器成功的关键在于,苄基自由基中间体可以被反应性(L ∗)Cu II CF 3对映选择性地捕获。另外,新型的含喹啉基的双恶唑啉配体在不对称三氟甲基化中起重要作用。
One-pot relay reduction–isomerization of β-trifluoromethylated-α,β-unsaturated ketones to chiral β-trifluoromethylated saturated ketones over combined catalysts in aqueous medium
作者:Xuelin Xia、Meng Wu、Ronghua Jin、Tanyu Cheng、Guohua Liu
DOI:10.1039/c5gc00479a
日期:——
Combining Ru-functionalized silica and RuCl(PPh3)3 enables one-pot relay reduction-isomerizations of β-CF3-substituted-α,β-unsaturated ketones to chiral saturated ketones.
Base-Catalyzed Stereospecific Isomerization of Electron-Deficient Allylic Alcohols and Ethers through Ion-Pairing
作者:Samuel Martinez-Erro、Amparo Sanz-Marco、Antonio Bermejo Gómez、Ana Vázquez-Romero、Mårten S. G. Ahlquist、Belén Martín-Matute
DOI:10.1021/jacs.6b08350
日期:2016.10.12
between an allylic anion and the conjugate acid of the base results in efficient transfer of chirality. Through this mechanism, stereochemical information contained in the allylic alcohols is transferred to the ketone products. The stereospecific isomerization is also applicable for the first time to allylicethers, yielding synthetically valuable enantioenriched (up to 97% ee) enol ethers.