Synthesis of Unsymmetrically Substituted Bipyridines by Palladium-Catalyzed Direct C−H Arylation of Pyridine <i>N</i>-Oxides
作者:Sasa Duric、C. Christoph Tzschucke
DOI:10.1021/ol200565u
日期:2011.5.6
Substituted bipyridines were efficiently prepared by direct coupling between pyridine N-oxides and halopyridines using a palladium catalyst. Pyridine N-oxides with electron-withdrawing substitutents gave the best yields. This method allows the convenient preparation of 2,2′-, 2,3′-, and 2,4′-bipyridines which are useful as functionalized ligands for metal complexes or as building blocks for supramolecular
Silica-Supported Vanadium-CatalyzedN-Oxidation of Tertiary Amines with Aqueous Hydrogen Peroxide
作者:Laxmidhar Rout、Tharmalingam Punniyamurthy
DOI:10.1002/adsc.200505166
日期:2005.12
A recyclable silica supported vanadium 1 catalyzes the oxidation of tertiray amines to the corresponding N-oxides with 30% H2O2 in high yield.
可回收的二氧化硅负载的钒1以高收率催化叔胺的氧化为相应的N-氧化物(含30%H 2 O 2)。
Ruthenium catalyzed oxidation of tertiary nitrogen compounds with molecular oxygen: an easy access to N-oxides under mild conditions
作者:Suman L. Jain、Bir Sain
DOI:10.1039/b202744p
日期:2002.5.9
A variety of tertiarynitrogencompounds have been efficiently oxidized to their corresponding N-oxides in excellent yields with molecular oxygen as a sole oxidant and ruthenium trichloride as catalyst.
unprecedented combination of light and P(III)/P(V) redox cycling for the efficient deoxygenation of aromatic amine N-oxides. Moreover, we discovered that a large variety of aliphatic amine N-oxides can easily be deoxygenated by using only phenylsilane. These practically simple approaches proceed well under metal-free conditions, tolerate many functionalities and are highly chemoselective. Combined experimental