One-pot preparation of isocyanides from amines and their multicomponent reactions: crucial role of dehydrating agent and base
作者:Sankar K. Guchhait、Garima Priyadarshani、Vikas Chaudhary、Darshan R. Seladiya、Tapan M. Shah、Nikita P. Bhogayta
DOI:10.1039/c3ra40347e
日期:——
A novel one-pot practical approach for the preparation of isocyanide directly from amine and its reaction has been developed. It employs formylation of amine, dehydration of formamide to isocyanide, and its multicomponent reactions (Ugi, Passerini, and Groebke–Blackburn–Bienaymé reactions). This method provides a significant solution to known synthetic difficulties of isocyanides. In this approach
<i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetrabromobenzene-1,3-disulfonamide and Poly(<i>N</i>-bromo-<i>N</i>-ethylbenzene-1,3-disulfonamide) as Mild and Efficient Catalysts for Solvent-free Synthesis of<i>N</i>-Cyclohexyl-2-aryl(alkyl)-imidazo[1,2-<i>a</i>]pyridin-3-amine Derivatives
作者:Ramin Ghorbani-Vaghei、Mostafa Amiri
DOI:10.1002/jhet.1875
日期:2014.8
have been synthesized in good to high yields from o-aminopyridine, aromatic and aliphatic aldehydes, and cyclohexyl isocyanide in the presence of N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide and poly(N-bromo-N-ethylbenzene-1,3-disulfonamide) as catalysts, at room temperature under solvent-free conditions.
N-环己基-2-芳基(烷基)-咪唑并[1,2 - a ]吡啶-3-胺衍生物已从邻氨基吡啶,芳香族和脂肪族醛以及在室温,无溶剂下,在N,N,N ',N'-四溴苯-1,3-二磺酰胺和聚(N-溴-N-乙基苯-1,3-二磺酰胺)的存在下环己基异氰化物情况。
Green synthesis of imidazo[1,2-a]pyridines using calix[6]arene-SO3H surfactant in water
In this research, greensynthesis of imidazo[1,2-a]pyridines in the presence of calix[n]arenes-SO3H as a Brønsted acid catalyst and surfactant is described. Using of calix[n]arenes in water provided a hydrophobic cavity that successfully carried out the synthesis reactions at short times with high yields. This catalyst system is recoverable with a simple extraction using an organic solvent and reusable
在这项研究中,描述了在杯[ n ]芳烃-SO 3 H作为布朗斯台德酸催化剂和表面活性剂的存在下绿色合成咪唑并[1,2- a ]吡啶。在水中使用杯芳烃[ n ]芳烃提供了疏水腔,该腔在短时间内成功地以高收率成功地进行了合成反应。该催化剂体系可通过使用有机溶剂的简单萃取而回收,并且可重复使用至少5个循环而不会损失其活性。
Eco-friendly synthesis of 3-aminoimidazo [1, 2-a] pyridines via a one-pot three-component reaction in PEG catalyzed by peptide nanofibers: as hydrogen-bonding organocatalyst
作者:Arash Ghorbani-Choghamarani、Zahra Taherinia
DOI:10.1007/s13738-019-01744-w
日期:2020.1
additives. The key advantages of catalytic systems are (1) using peptide nanofibers as powerful hydrogen-bonding organocatalysts for the synthesis of 3-aminoimidazo [1, 2-a] pyridines, (2) having high catalytic activity, and (3) performing the reactions which can be carried out in PEG, as greensolvent instead of the usually used organic solvents. This catalyst could be recycled and reused at least for
Microwave-assisted three-component reaction in conventional solvents and ionic liquids for the synthesis of amino-substituted imidazo[1,2-a]pyridines
作者:Fadime Mert-Balci、Jürgen Conrad、Uwe Beifuss
DOI:10.3998/ark.5550190.0013.318
日期:——
Amino-substituted imidazo(1,2-a)pyridines can be prepared with yields up to 98% within a few minutes by microwave-assisted three-component reaction between 2-aminopyridines, aldehydes and isocyanides using montmorillonite as the catalyst and toluene as the solvent. The organic solvent can be replaced by ionicliquids. With guanidinium salts the microwave-assisted reaction can be performed in the absence