Novel Approach for the Synthesis ofN-Substituted Pyrroles Starting Directly from Nitro Compounds in Water
摘要:
A novel approach for a facile high-yielding synthesis of N-substituted pyrroles has been discovered by the treatment of nitroarenes with 2,5-dimethoxytetrahydrofuran using indium in dilute aqueous HCl at room temperature.
An operationally simple, practical, and economical protocol for iron(III) chloride catalyzed Paal-Knorr pyrrole synthesis in water in good to excellent yields has been developed. Several N-substituted pyrroles are readily prepared from the reaction of 2,5-dimethoxytetrahydrofuran and aryl/alkyl, sulfonyl and acyl amines under very mild reaction conditions
l-(+)-Tartaric acid and choline chloride based deep eutectic solvent: An efficient and reusable medium for synthesis of N-substituted pyrroles via Clauson-Kaas reaction
作者:Ping Wang、Fei-Ping Ma、Zhan-Hui Zhang
DOI:10.1016/j.molliq.2014.07.015
日期:2014.10
l-(+)-Tartaric acid–choline chloride based deep eutectic solvent has been found to be an effective promoted medium for Clauson-Kaas reaction of aromatic amines and 2,5-dimethoxytetrahydrofuran. Structurally diverse N-substituted pyrroles were obtained in high to excellent yields under mild conditions. The deep eutectic solvent is inexpensive, non-toxic, reusable and biodegradable.
Solvent Free Synthesis of N-Substituted Pyrrole Derivatives Catalyzed by Silica Sulfuric Acid
作者:A. J. Khammas、C. Yolacan、F. Aydogan
DOI:10.1134/s1070363218120332
日期:2018.12
Sulfuric acid immobilized on silica gel is used as an efficient catalyst in the synthesis of N-substituted pyrrole derivatives by the Clauson–Kaas pyrrole synthesis. The solvent free reaction mixture is stirred by grinding. Within very short reaction time the process leads to the corresponding products without any decomposition recorded.
Solvent Free Synthesis of N‐Substituted Pyrroles Catalyzed by Calcium Nitrate
作者:Rucha R. Wani、Hemchandra K. Chaudhari、Balaram S. Takale
DOI:10.1002/jhet.3507
日期:2019.4
Moderated and mild way for synthesizing N‐substituted pyrrole has been demonstrated herein. No solvents need to be used for this reaction, and instead, reactants themselves acted as a reaction medium. In fact, the reaction is carried out using catalytic amount of Ca(NO3)2.4H2O. The reaction conditions are selective and mild that helped to tolerate a wide variety of functional groups to give the desired
Scandium triflate-catalysed synthesis of <i>N</i>-substituted pyrroles from amine and 2,5-dimethoxytetrahydrofuran
作者:Bing Zuo、Jiuxi Chen、Miaochang Liu、Jinchang Ding、Huayue Wu、Weike Su
DOI:10.3184/030823409x393628
日期:2009.1
The Clauson–Kass pyrrole synthesis catalysed by scandium triflate afforded N-substituted 2- and 3-unsubstituted pyrroles with yields ranged from good to excellent. Aromatic amines, heteroaomatic amines, 4-methylbenzenesulfonamide and 2-chlorobenzamide are good substrates in this transformation.