<i>Para</i>-Selective Cu-Catalyzed C–H Aryloxylation of Electron-Rich Arenes and Heteroarenes
作者:Igors Sokolovs、Edgars Suna
DOI:10.1021/acs.joc.5b02728
日期:2016.1.15
Cu-catalyzed reaction of phenols with electron-rich arene or heteroarene ligands of unsymmetrical diaryl-λ3-iodanes is a key step in the developed one-pot two-step method for intermolecular para-selective C–H aryloxylation of heteroarenes and arenes.
Copper-Catalyzed Intermolecular C–H Amination of (Hetero)arenes via Transient Unsymmetrical λ<sup>3</sup>-Iodanes
作者:Igors Sokolovs、Dmitrijs Lubriks、Edgars Suna
DOI:10.1021/ja502174d
日期:2014.5.14
A one-pot two-step method for intermolecular C-H amination of electron-rich heteroarenes and arenes has been developed. The approach is based on a room-temperaturecopper-catalyzed regioselective reaction of the in situ formed unsymmetrical (hetero)aryl-λ(3)-iodanes with a wide range of primary and secondary aliphatic amines and anilines.
Indirect C–H Azidation of Heterocycles via Copper-Catalyzed Regioselective Fragmentation of Unsymmetrical λ<sup>3</sup>-Iodanes
作者:Dmitrijs Lubriks、Igors Sokolovs、Edgars Suna
DOI:10.1021/ja305574k
日期:2012.9.19
A C-H bond of electron-rich heterocycles is transformed into a C-N bond in a reaction sequence comprising the formation of heteroaryl(phenyl)iodonium azides and their in situ regioselective fragmentation to heteroaryl azides. A Cu(I) catalyst ensures complete regiocontrol in the fragmentation step and catalyzes the subsequent 1,3-dipolar cycloaddition of the formed azido heterocycles with acetylenes. The heteroaryl azides can also be conveniently reduced to heteroarylamines by aqueous ammonium sulfide. The overall C-H to C-N transformation is a mild and operationally simple one-pot sequential multistep process.
Iodonium Salts Are Key Intermediates in Pd-Catalyzed Acetoxylation of Pyrroles
作者:Dmitrijs Lubriks、Igors Sokolovs、Edgars Suna
DOI:10.1021/ol201665c
日期:2011.8.19
room-temperature Pd-catalyzed acetoxylation of pyrroles with phenyliodonium acetate is described. The acetoxylation was found to proceed via the initial formation of pyrrolyl(phenyl)iodonium acetates, which were converted to acetoxypyrroles in the presence of Pd(OAc)2. The acetoxylation could also be carried out as a one-pot sequential procedure without the isolation of the intermediate iodonium salts.