<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。
Visible-light-activated C–C and C–N bond formation in the synthesis of imidazo[1,2-<i>a</i>]pyridines and imidazo[2,1-<i>b</i>]thiazoles under catalyst and solvent-free conditions
作者:Km Neha Shivhare、Manish K. Jaiswal、Anushree Srivastava、Saurabh K. Tiwari、I. R. Siddiqui
DOI:10.1039/c8nj03339k
日期:——
Synthesis of 3-aminoimidazo-fused heterocycles via the Groebke–Blackburn–Bienaymé reaction using a universally available energy source under catalyst and solvent-free conditions.
A facile protocol for the synthesis of 3-aminoimidazo-fused heterocycles via the Groebke–Blackburn–Bienayme reaction under catalyst-free and solvent-free conditions
作者:Shinde Vidyacharan、Anand H. Shinde、Bishnupada Satpathi、Duddu S. Sharada
DOI:10.1039/c3gc42130a
日期:——
A one-pot catalyst, solvent, work-up and column free synthesis of 3-aminoimidazo-fused heterocycles by a three-component reaction of a 2-aminoheterocycle, aldehyde, and isocyanide is presented. This efficient and green protocol has the advantages of environmental friendliness, high yields and operational simplicity.
A novel and efficient four-component approach for the synthesis of 2,3-disubstituted imidazo[1,2-a]pyridines is described. The copper-catalyzed reductive amination of 2-bromopyridine by sodium azide followed by sequential condensation and cyclization with aldehydes and isocyanides afforded the corresponding imidazo[1,2-a]pyridines in good yields.
描述了一种新颖有效的四组分合成2,3-二取代的咪唑并[1,2- a ]吡啶的方法。叠氮化钠经铜催化的2-溴吡啶的还原胺化反应,然后依次缩合并与醛和异氰酸酯环化,可得到相应的咪唑并[1,2- a ]吡啶。