In the present work the behavior of different substituted iminic bonds toward the oxidative action of 3-chloroperbenzoic acid is reported. The C=N bond was or was not oxidized to oxaziridines, amides, oximes, nitroso-, nitro-, and azodioxy compounds depending on the substituents at the iminic group and on the imine/MCPBA stoichiometric ratio.
The straightforward synthesis of N,N-disubstituted formamides using a combination of 1,1,1,3,3,3-hexafluoroispropanol (HFIP) and H2O2 is described. The unique features of HFIP allowed the utilization of a green oxidant such as H2O2, and the products, arising from an oxidation–rearrangement sequence, were obtained in good to high yields under smooth reaction conditions.
描述了使用1,1,1,3,3,3-六氟异丙醇(HFIP)和H 2 O 2的组合直接合成N,N-二取代甲酰胺。HFIP的独特功能允许利用绿色氧化剂(例如H 2 O 2),并且在平稳的反应条件下,以高至高收率获得了由氧化重排序列产生的产物。
An oxidative rearrangement of C,N-diarylaldimines to formamides using sodium perborate
作者:Pakawan Nongkunsarn、Christopher A. Ramsden
DOI:10.1016/s0040-4039(00)61698-2
日期:1993.10
Treatment of C,N-diaryladium (5) with sodium tetrahydrate in triflouroacetic acid solution at 70–80°C results in an oxidative rearrangement to N,N-diarylformamides (6(Scheme 1). A mechanism involving the initial formation of 2,3-diaryloxaziridines is proposed (Scheme 2).
Copper-catalyzed C–N coupling of amides and nitrogen-containing heterocycles in the presence of cesium fluoride
作者:Dean P. Phillips、Xue-Feng Zhu、Thomas L. Lau、Xiaohui He、Kunyong Yang、Hong Liu
DOI:10.1016/j.tetlet.2009.10.041
日期:2009.12
The copper-catalyzed C-N coupling of amides to arylhalides usually requires the use of strong alkali metal bases, such as K2CO3, K3PO4, and Cs2CO3, at high temperature. We discovered that CsF is sufficiently basic to promote the cross-coupling of amides and carbamates With aryl halides. Most aryl iodides coupled in high yield at room temperature. This alternative base may be a suitable replacement for substrates that are incompatible with high temperature and strongly basic conditions and can further enhance the chemoselectivity of this reaction. (C) 2009 Elsevier Ltd. All rights reserved.
Oxidation of aldimines to amides by m-CPBA and BF3·OEt2
Several amides were obtained in high yields by an efficient method from the corresponding imines which are readily prepared from aldehydes. This procedure involves the oxidation of aldimines with m-CPBA and BF3.OEt2. In this reaction, the product is strongly influenced by the electron releasing capacity of the aromatic substituent. (C) 2003 Elsevier Science Ltd. All rights reserved.