Tri(1-butyl-3-methylimidazolium) gadolinium hexachloride, ([bmim]3[GdCl6]), a magnetic ionic liquid as a green salt and reusable catalyst for the synthesis of tetrasubstituted imidazoles
作者:Ali Akbari
DOI:10.1016/j.tetlet.2015.12.053
日期:2016.1
The magnetic ionicliquid, tri(1-butyl-3-methylimidazolium) gadolinium hexachloride, ([bmim]3[GdCl6]), has been used as an efficient green catalyst for the one-potsynthesis of 1,2,4,5-tetrasubstitutedimidazoles via the condensation of benzil, an aromatic aldehyde, aniline, and ammonium acetate. Good to excellent yield, mild reaction conditions, as well as ease of operation and work-up are some advantages
A simple and efficient procedure for the preparation of silica-bonded propylpiperazine-N-sulfamic acid (SBPPSA) by the reaction of 3-piperazine-N-propylsilica (3-PNPS) and chlorosulfonic acid in chloroform is described. Silica-bonded propylpiperazine-N-sulfamic acid is employed as a recyclablecatalyst for the synthesis of highly substituted imidazoles from the reaction of benzil, aromatic aldehydes
The four‐component condensation of benzil, aromatic aldehyde, primary amine, and ammonium acetate catalyzed by TFA in ionic liquid [Bpy]BF4 at 80°C provided 1,2,4,5‐tetrasubstituted imidazoles in moderate to high yields.
Increased SBA-15-SO3H Catalytic Activity through Hydrophilic/Hydrophobic Fluoroalkyl-Chained Alcohols (RFOH/SBA-15–Pr-SO3H)
作者:Sadegh Rostamnia、Esmail Doustkhah
DOI:10.1055/s-0034-1380683
日期:——
A superior catalytic activity for the SBA-15-functionalized sulfonic acid containing fluoroalkyl chain alcohols (RFOH/SBA-15-Pr-SO3H adduct) is presented for the synthesis of highly substituted imidazoles. The advantages of this method include low catalyst loading, simple procedure, excellent yields, recyclability of catalyst, and short reaction times.