Publication
Title
ONSH: optimization of oxidative alkylamination reactions through study of the reaction mechanism
Author
Abstract
Oxidative alkylamination of electron-deficient (hetero)aromatic compounds, via the nucleophilic substitution of hydrogen, is a methodology that has made significant progress since the introduction of AgPy2MnO4 as oxidant. This oxidant generally gives good conversions and yields, whereas the use of KMnO4 only sometimes works equally well. In order to rationalize this, the reaction mechanism of oxidative alkylamination has been studied. 3-Nitropyridine (1), 1,3-dinitrobenzene (2), and quinazoline (3) were chosen as model substrates and n-butylamine and pyrrolidine as model alkylamines. The rate-limiting step of the mechanism for these substrate/alkylamine combinations was determined. With the use of 1H NMR spectroscopy thermodynamic properties of σΗ-adduct formation were deduced and the effect of additives on the adduct formation was investigated. The fundamental insights resulting from these studies led to the identification of a cheap additive (tetrabutylammonium chloride), which in combination with the standard and cheap oxidant KMnO4 generally gave excellent yields, similar to the ones previously obtained with more expensive AgPy2MnO4.
Language
English
Source (journal)
The journal of organic chemistry. - Washington, D.C.
Publication
Washington, D.C. : 2010
ISSN
0022-3263
Volume/pages
75:15(2010), p. 5126-5133
ISI
000280398100026
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 12.07.2010
Last edited 14.07.2017
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