One-pot Tandem Reactions for Direct Conversion of Thiols and Disulfides to Sulfonic Esters, Alcohols to Bis(indolyl)methanes and Synthesis of Pyrroles Catalyzed by N-Chloro Reagents
convenient synthesis of sulfonic esters from thiols and disulfides has been described. In situ preparation of sulfonyl chlorides from thiols is accomplished by oxidation with Chloramin-T, tetra-butylammonium chloride (t-Bu4NCl) and water. The sulfonyl chlorides are then further allowed to react with phenol derivatives in the same reaction vessel. Also, a facile synthesis of bis(indolyl)methanes from alcohols
One-pot tandem reactions for direct conversion of thiols and disulfides to sulfonic esters, and Paal–Knorr synthesis of pyrrole derivatives catalyzed by TCCA
thiols is accomplished by oxidation with trichloroisocyanuric acid (TCCA), tetra-butylammonium chloride (t-Bu4NCl), and water. The sulfonyl chlorides are then further allowed to react with phenol derivatives in the same reaction vessel. Also, a facile synthesis of N-substituted pyrroles by the reaction of hexane-2,5-dione with primary amines has been accomplished using TCCA as a catalyst under mild condition
Sustainable Manganese-Catalyzed Solvent-Free Synthesis of Pyrroles from 1,4-Diols and Primary Amines
作者:Jannik C. Borghs、Yury Lebedev、Magnus Rueping、Osama El-Sepelgy
DOI:10.1021/acs.orglett.8b03506
日期:2019.1.4
A general and selective metal-catalyzed conversion of biomass-derived primary diols and amines to the highly valuable 2,5-unsubstituted pyrroles has been developed. The reaction is catalyzed by a stable nonprecious manganese complex (1 mol %) in the absence of organic solvents whereby water and molecular hydrogen are the only side products. The manganese catalyst shows unprecedented selectivity, avoiding
Novel and highly efficient preparation of pyrroles using supported ionic liquid ILCF3SO3@SiO2 as a heterogeneous catalyst
作者:Yang Liu、Yu Lin Hu
DOI:10.1007/s13738-018-1300-8
日期:2018.5
AbstractA supported ionic liquid ILCF3SO3@SiO2 was synthesized and used as a highly efficient catalyst in the Paal–Knorr reaction for the preparation of pyrroles. The heterogeneous catalyst could be easily recovered and recycled for five times without noticeable loss of catalytic activity. Also a possible reaction mechanism is provided. Graphical Abstract
摘要合成了负载型离子液体ILCF 3 SO 3 @SiO 2,并在Paal-Knorr反应中用作制备吡咯的高效催化剂。该非均相催化剂可以容易地回收和再循环五次,而没有明显的催化活性损失。还提供了可能的反应机理。 图形概要
Synthesis of 2,5-Dimethyl-<i>N</i>-substituted Pyrroles Catalyzed by Diethylenetriaminepentaacetic Acid Supported on Fe<sub>3</sub>O<sub>4</sub> Nanoparticles
addressing this issue, nanoparticles (NPs) have emerged as support materials due to their high surface areas and catalyst loading capacity, improved catalytic activity and dispersability in the reaction medium. Among the various nanoparticle supports, magnetic nanoparticles are efficient and readily available. They have high surface area resulting in high catalyst loading capacity and outstanding stability