Synthesis of highly substituted imidazoles using Brønsted acidic ionic liquid, triphenyl(propyl-3-sulphonyl)phosphonium toluenesulfonate, as teusable catalyst
作者:H. R. Shaterian、M. Ranjbar、K. Azizi
DOI:10.1007/bf03246570
日期:2011.12
Brønsted acidic ionicliquid, triphenyl(propyl-3-sulphonyl)phosphonium toluenesulfonate, has been used as an efficient and reusable catalyst for the one-potsynthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstitutedimidazoles under solvent-free conditions in excellent yields.
An environmental friendly approach for the synthesis of highly substituted imidazoles using Brønsted acidic ionic liquid, N-methyl-2-pyrrolidonium hydrogen sulfate, as reusable catalyst
作者:Hamid Reza Shaterian、Mohammad Ranjbar
DOI:10.1016/j.molliq.2011.02.012
日期:2011.4
Brønsted acidic ionicliquid, N-methyl-2-pyrrolidonium hydrogen sulfate, has been used as an efficient and reusable catalyst for the one-potsynthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstitutedimidazoles under thermal solvent-free conditions in excellent yields.
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.
Raghuvanshi; Singh, Krishna Nand, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2010, vol. 49, # 10, p. 1394 - 1397