A simple and efficient CN cross‐coupling method of arylhalides with various heterocycles was reported, by using 10 mol% of CuI as catalyst and 1.2 equiv. NaH as base. Aryl iodides, aryl bromides and many substituted aryl chlorides could efficiently react with heterocycles, providing variety of N‐arylated products in good to excellent yields. The ligand‐free catalyst system was stable in air and could
“Zero VOC” Synthetic Strategy - Aromatic Amination Reactions in Deep Eutectic Solvents
作者:Arun Valvi、Shraeddha Tiwari
DOI:10.1002/ejoc.201800785
日期:2018.9.23
Nucleophilic aromatic substitution reactions of 2,4‐dinitrohalobenzene with secondary amines were carried out in deep eutectic solvents (DES) to give excellent yields. The reaction workup involved the addition of water for separating the product, which indicates that DES is an entirely benign reaction medium for the SNAr reactions. More importantly, the DES exhibited excellent recyclability.
The 2,4-dinitrophenylation of thiol or amino group with 1,2,4-trinitrobenzene proceeded quantitatively at pH 8.5 and 30 °C. The rate of S-dinitrophenylation was ≈104 times faster than that of N-dinitrophenylation. So this reaction can be used for both the determination of thiol even in the presence of large excess amine and the specific modification of thiol in proteins.
硫醇或氨基与 1,2,4-三硝基苯的 2,4-二硝基苯基化反应在 pH 8.5 和 30 °C 下定量进行。 S-二硝基苯基化的速率比N-二硝基苯基化的速率快约104倍。因此,该反应既可用于在存在大量过量胺的情况下测定硫醇,又可用于蛋白质中硫醇的特异性修饰。
Visible-Light Mediated Reaction of Indole with Aryl Halides Using Porphyrin Photocatalyst: A Feasible Technique to Afford N-Functionalized Indoles
作者:Vijay Shivaji Patil、Pundlik Rambhau Bhagat
DOI:10.1007/s10562-024-04613-1
日期:——
involvement of nitrogenous scaffolds including drug moieties and naturally occurring compounds. The formation of N-functionalized indoles is an enormous challenge in pharmaceutical industries and fine chemicals at ambient conditions. Metal/Base free N-arylation methods are rated one of the best favourable protocols for avoiding metal contamination in the finished products. Herein, ionic liquid entangled sulphonic