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
One-pot synthesis of N-substituted pyrroles from nitro compounds and 2,5-hexadione over a heterogeneous cobalt catalyst
作者:Zheng Gong、Yu Lei、Peng Zhou、Zehui Zhang
DOI:10.1039/c7nj01898c
日期:——
study, the one-pot heterocyclization of nitro compounds with 2,5-hexadione was studied for the synthesis of N-substituted pyrroles via a Paal–Knorr condensation process. The heterogeneous cobalt–nitrogen catalyst (Co–Nx/C-800-AT) was found to be active for this reaction with formic acid. Formic acid served as a hydrogen donor for the transfer hydrogenation, and also acted as an acidcatalyst. More importantly
在这项研究中,研究了通过Paal–Knorr缩合过程将硝基化合物与2,5-己二酮进行一锅法杂环合成N-取代的吡咯。发现多相钴-氮催化剂(Co-N x / C-800-AT)在与甲酸的该反应中具有活性。甲酸用作转移加氢的氢供体,也用作酸催化剂。更重要的是,该方法对其他官能团具有耐受性,因此以高至优异的产率制备了各种N-取代的吡咯。Co-N x / C-800-AT催化剂非常稳定,可以重复使用几次而不会损失其催化活性。
Squaric acid catalyzed simple synthesis of N-substituted pyrroles in green reaction media
AbstractAn operationally simple and efficient protocol for squaric acidcatalyzed synthesis of N-substituted pyrroles via the reaction of 2,5-dimethoxytetrahydrofuran and 2,5-hexandione with aryl amines in green reaction media (water, deep eutectic solvent, and polyethylene glycol) under ultrasound irradiation or thermal conditions in good to excellent yields has been developed. Graphical abstract
One-pot synthesis of cyclohexylamine and <i>N</i>-aryl pyrroles <i>via</i> hydrogenation of nitroarenes over the Pd<sub>0.5</sub>Ru<sub>0.5</sub>-PVP catalyst
The direct synthesis of cyclohexylamine via the hydrogenation of nitrobenzene over monometallic (Pd, Ru or Rh) and bimetallic (PdxRu1−x) catalysts was studied. The Pd0.5Ru0.5-PVP catalyst was the most effective catalyst for this reaction. The catalyst can be reused and applied for the synthesis of N-aryl pyrroles and quinoxalines from nitrobenzenes.
研究了在单金属(Pd,Ru或Rh)和双金属(Pd x Ru 1- x)催化剂上通过硝基苯加氢直接合成环己胺的方法。Pd 0.5 Ru 0.5 -PVP催化剂是该反应最有效的催化剂。该催化剂可以重复使用并用于由硝基苯合成N-芳基吡咯和喹喔啉。