A first high enantiocontrol of an asymmetric tertiary carbon center attached with a fluoroalkyl group via Rh(I)-catalyzed conjugate addition reaction
摘要:
Treatment of fluoroalkylated electron-deficient olefins with various boronic acids in the presence of a catalytic amount of Rh(l) coordinated with (S)-BINAP in toluene/H2O at the reflux temperature for 3 h gave the corresponding conjugate addition products with high enantioselectivity in high yields. (C) 2008 Elsevier Ltd. All rights reserved.
the 4,4,4-trifluorobut-2-en-1-ol system undermetal-freeconditions to afford the corresponding saturated ketones in high to excellent chemical yields using such a convenient and easy-to-handle base as DBU at the toluene refluxing temperature, and utilization of the corresponding optically active substrates unambiguously demonstrated that this transformation proceeded in a highly stereoselective fashion
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.
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.
Ruthenium-Catalyzed One-Pot Tandem Isomerization-Transfer Hydrogenation Reactions of γ-Trifluoromethylated Allylic Alcohols and β-Trifluoromethylated Enones
transform γ‐trifluoromethylatedallylicalcohols and β‐trifluoromethylated enones into the corresponding saturated alcohols in excellent yields via a one‐pot tandem process involving isomerization and transfer hydrogenation(s). High stereospecificity was demonstrated and evidence for two mechanisticpathways is provided. The method was applied to a rapid synthesis of trifluoromethylated citronellol
Iron(II) complexes are suitable catalysts for the isomerization of trifluoromethylated allylic alcohols. Synthesis of trifluoromethylated dihydrochalcones
We demonstrated that iron(II) complexes can substitute platinum metals as well as iron(0) carbonyls for the isomerization of γ-trifluoromethylated allylic alcohols into β-trifluoromethylated ketones. In particular, iron(II)-tetra(isonitrile) complexes were employed for the synthesis of a series of trifluoromethylated dihydrochalcones variously decorated on each aromatic ring.