for promoting oxidation of amines in aqueous-organic medium was developed. NaIO4 and TEMPO as the catalyst emerged as the most efficient and selective system for oxidation of differently substituted benzyl amines to the corresponding benzaldehydes without overoxidation. Unsymmetrical secondary amines underwent selectiveoxidation only at the benzylic position thus realising an oxidative deprotection
开发了一种新的无金属方案,用于促进水-有机介质中胺的氧化。 NaIO 4和 TEMPO 作为催化剂,成为将不同取代的苄胺氧化成相应苯甲醛且不发生过度氧化的最有效和选择性的系统。不对称仲胺仅在苄基位置进行选择性氧化,从而实现了苄基基团的氧化脱保护,并且易于胺回收。
Intramolecular C−H Amination of
<i>N</i>
‐Alkylsulfamides by
<i>tert</i>
‐Butyl Hypoiodite or
<i>N</i>
‐Iodosuccinimide
作者:Kensuke Kiyokawa、Keisuke Jou、Satoshi Minakata
DOI:10.1002/chem.202102635
日期:2021.10.7
1,3-Diamines are an important class of compounds that are broadly found in natural products and are also widely used as building blocks in organic synthesis. Although the intramolecular C−H amination of N-alkylsulfamide derivatives is a reliable method for the construction of 1,3-diamine structures, the majority of these methods involve the use of a transition-metal catalyst. We herein report on a
Herein is described an efficient and chemoselective method for the synthesis of diversely substituted secondary amines in yields up to 98 %. Direct mono-N-alkylation of primary benzylamines and anilines with a wide range of alkyl halides is promoted by a cesium base in the absence of any additive or catalyst. The basicity and solubility of cesium carbonate in anhydrous N,N-dimethylformamide not only
Switching the<i>N</i>-Alkylation of Arylamines with Benzyl Alcohols to Imine Formation Enables the One-Pot Synthesis of Enantioenriched α-<i>N</i>-Alkylaminophosphonates
作者:Natalie Hofmann、Kai C. Hultzsch
DOI:10.1002/ejoc.201900209
日期:2019.6.2
The base‐free N‐alkylation of anilines with benzylic alcohols can be switched in favor of imine formation simply by switching between a closed and an open reaction system. Further functionalization of the in situ synthesized imine leads to α‐N‐alkylaminophosphonates via a one‐pot procedure in an atom‐economic fashion.
Copper-catalysed reductive amination of nitriles and organic-group reductions using dimethylamine borane
作者:Dominic van der Waals、Alan Pettman、Jonathan M. J. Williams
DOI:10.1039/c4ra11193a
日期:——
heterogeneous copper catalyst, formed in situ, has been shown to dehydrocouple commercially available amine boranes whilst transferring hydrogen for the reduction of selected organic functional groups in an aqueous medium. The catalytic system has also been shown to promote the reductiveamination of aryl nitriles.