One-pot relay reduction–isomerization of β-trifluoromethylated-α,β-unsaturated ketones to chiral β-trifluoromethylated saturated ketones over combined catalysts in aqueous medium
Diastereoselective and Enantioselective Epoxidation of Acyclic β-Trifluoromethyl-β,β-Disubstituted Enones by Hydrogen Peroxide with a Pentafluorinated Quinidine-Derived Phase-Transfer Catalyst
efficient catalytic asymmetric epoxidation of β‐trifluoromethyl‐β,β‐disubstituted unsaturated ketones has been achieved by a pentafluorine‐substituted phase‐transfer catalyst with hydrogenperoxide (30%). Thus, the β‐trifluoromethyl‐α,β‐epoxy ketones with a quaternary carbon centre were obtained in excellent diastereoselectivities (up to 100:1 dr) and excellent enantioselectivities (up to 99.7% ee). Low catalyst
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
Enantioselective 1,2-reductions of β-trifluoromethylated-α,β-unsaturated ketones to chiral allylic alcohols over organoruthenium-functionalized mesoporous silica nanospheres
作者:Meng Wu、Lingyu Kong、Kaiwen Wang、Ronghua Jin、Tanyu Cheng、Guohua Liu
DOI:10.1039/c4cy01404a
日期:——
silica nanospheres are prepared through the co-assembly of chiral (4-(trimethoxysilyl)ethyl)phenylsulfonyl-1,2-diphenylethylene-diamine and tetraethoxysilane followed by complexation with an organoruthenium complex. Structural analysis and characterization disclose its well-defined single-site organoruthenium active center, and electron microscopy images reveal its uniformly distributive, mesostructured