A mild trifluoromethylation reaction of N,N-disubstitutedhydroxylamines that is tolerant towards a variety of functional groups, including nitriles, alcohols, ketones, esters, amides, imides, and nitrogen heterocycles, is reported. The key feature of this reaction is the activation of the CF3 reagent with either trimethylsilyl triflate or LiClO4 and partial or full deprotonation of the substrate with
Grafting of a rhenium-oxo complex on Schiff base functionalized graphene oxide: an efficient catalyst for the oxidation of amines
作者:Praveen K. Khatri、Shivani Choudhary、Raghuvir Singh、Suman L. Jain、Om P. Khatri
DOI:10.1039/c3dt53421a
日期:——
A rhenium-oxo complex such as methyltrioxorhenium (MTO) has been homogeneously immobilized on a Schiff base modified graphene oxide (GrO) support via covalent bonding. The loading of MTO on GrO nanosheets was monitored by FTIR, TG-DTA, and elemental analyses. The developed heterogeneous catalyst is found to be efficient for the oxidation of various amines to the corresponding N-oxides using hydrogen
Effective Oxidation of Secondary Amines to Nitrones with Alkyl Hydroperoxides Catalysed by (Trialkanolaminato)titanium(IV) Complexes
作者:Massimiliano Forcato、Miriam Mba、William A. Nugent、Giulia Licini
DOI:10.1002/ejoc.200900867
日期:2010.2
The effective catalytic oxidation of secondaryamines to nitrones with alkyl hydroperoxides as the primary oxidants is described. The titanium alkoxide catalysts are protected from the water co-product by the combined use of a tightly binding trialkanolamine ligand and molecular sieves. Nitrones can be obtained in high yields (up to 98 %) under homogeneous, anhydrous conditions and even in the absence
photocatalytic aerobic oxidative dehydrogenation reactions of N,N-disubstituted hydroxylamines to nitrones were developed with an in situ generated photocatalyst based on commercially available 3,6-dichlorotetrazine. This process affords a wide range of nitrones in high yields under mild conditions. In addition, an oxidative (3+3) cycloaddition between an oxyallyl cation precursor and a hydroxylamine was also developed
Cycloaddition Reactions of Alkyl Cyclopropenecarboxylates Generated in situ with Nitrones: Construction of Substituted Pyrroles and 1,2-Oxazinanes
作者:Junhao Hu、Min Zhang、Yuefa Gong
DOI:10.1002/ejoc.201403551
日期:2015.3
A highly regioselective [3+2] cycloadditionreaction of nitrones 1 with alkyl 2-aroylcyclopropenecarboxylates generated in situ from alkyl 2-aroyl-1-chlorocyclopropanecarboxylates 2 under basic conditions is described. The reaction proceeded readily to afford ring-fused isoxazolidines 3 in moderate-to-high yields. The strained ring-fused cycloaddition products were selectively transformed into the