DABCO catalyzed highly regioselective synthesis of fused imidazo-heterocycles in aqueous medium
作者:Vikas M. Bangade、B. Chennakesava Reddy、Pramod B. Thakur、B. Madhu Babu、H.M. Meshram
DOI:10.1016/j.tetlet.2013.06.123
日期:2013.8
efficient regioselectivesynthesis of 3-aryl imidazo[1,2-a]pyridines, 5-aryl imidazo[2,1-b]thiazoles, and 3-aryl benzo[d]imidazo[2,1-b][1,3]thiazoles is described by the reaction of phenacyl bromide with heterocyclic amine in the presence of DABCO under aqueousmedium. The method is applicable for a variety of substituted phenacyl bromides as well as 2-amino-heterocycles. An aqueous reaction medium, regioselectivity
有效的区域选择性合成3-芳基咪唑并[1,2- a ]吡啶,5-芳基咪唑并[2,1- b ]噻唑和3-芳基苯并[ d ]咪唑并[2,1- b ] [1, 3]噻唑的描述是在水介质中在DABCO存在下,苯甲酰溴与杂环胺反应。该方法适用于各种取代的苯甲酰溴以及2-氨基杂环。水性反应介质,区域选择性,温和的反应条件和高产率的产物是该方案的重要特征。
Synthesis and characterization of fluconazole-functionalized magnetic nanoparticles as a catalyst for the synthesis of 3-aryl and 3-amino-imidazo[1,2-a]pyridines
Fluconazole immobilised on modified Fe3O4–SiO2 core–shell nanoparticles was synthesised, characterised and used as a catalyst in synthesis of 3-aryl and 3-amino-imidazo[1,2-a]pyridines.
A facile method for direct Pd(OAc)2-catalyzed oxidative cross-coupling of unactivated imidazo[1,2-a]pyridine with simplearenes has been developed. The reaction shows good reaction efficiency, high regioselectivity, and good functional-group compatibility. This approach provides a useful protocol for the preparation of imidazo[1,2-a]pyridine–arene structure of interest in biological and pharmaceutical
已开发了一种简便的方法,用于未活化的咪唑并[1,2- a ]吡啶与简单的芳烃的直接Pd(OAc)2催化的氧化交叉偶联。该反应显示出良好的反应效率,高的区域选择性和良好的官能团相容性。该方法为生物和药物材料中感兴趣的咪唑并[1,2 - a ]吡啶-芳烃结构的制备提供了有用的方案。
Monodentate Palladium Complexes Bearing Abnormal and Normal Carbene Ligands with a Formally Identical Steric Environment
作者:Chun-Hung Ke、Bing-Chiuan Kuo、Debkumar Nandi、Hon Man Lee
DOI:10.1021/om4004219
日期:2013.9.9
environment around the metal center. The corresponding ligand precursors were prepared via the key steps based on Pd-catalyzed directC–Harylation between imidazo[1,2-a]pyridine and arylbromides and Cu-catalyzed C–N coupling reactions between benzoimidazole and arylbromides. The new complexes were characterized by 1D and 2D NMR spectroscopy, X-ray crystallography, and elemental analysis. The isomeric
products in metal‐catalyzed direct arylation reactions. We found that the use of only 1 mol% of the heterogeneous catalyst Pd/C promotes very efficiently the direct arylations of most heteroaromatics. In the presence of this catalyst and potassium acetate as the base, the direct arylation of thiophenes, furans, pyrroles, thiazoles, imidazoles or isoxazoles, using arylbromides as coupling partners, proceeds