Pyrrole and Pyrazole Ring Closure in Heterogeneous Media
作者:F. Texier-Boullet、B. Klein、J. Hamelin
DOI:10.1055/s-1986-31655
日期:——
Pyrroles and pyrazoles may be conveniently prepared by dispersing primary amines or hydrazines and 1,4- or 1,3-diketones, respectively, on alumina or clay (montmorillonite K 10) without solvent, keeping the mixture at 20°C or higher temperatures for 1-26 h, and then eluting the product with dichloromethane.
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
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
Silica sulfuric acid (SSA) as a solid acid heterogeneous catalyst for one-pot synthesis of substituted pyrroles under solvent-free conditions at room temperature
作者:Hojat Veisi
DOI:10.1016/j.tetlet.2010.02.052
日期:2010.4
A variety of N-substituted pyrroles have been synthesized by reacting γ-diketones with amines, diamines or triamine in the presence of silica sulfuricacid (SSA) at room temperature under solvent-free conditions. The experiment protocol features simple operations, and the products are isolated in high to excellent yields (70–98%).
A simple, economical, and green approach to the synthesis of N-substituted pyrrolesusingsodiumdodecylsulfate as surfactant in water is described. The experiment protocol features simple operations, and the products are isolated in high to excellent yields (60–98%).