Tandem approach for the synthesis of imidazo[1,2-a]pyridines from alcohols
摘要:
Propylphosphonic anhydride ((R) T3P) is shown to be an effective and mild reagent for the one-pot synthesis of imidazo[1,2-a]pyridines from a variety of alcohols. Alcohols are oxidized in situ to aldehydes under mild conditions, which in turn undergo a three-component reaction with various 2-aminopyridines and isocyanides to afford imidazo[1,2-a]pyridines in excellent yields. T3P acts as an activator for both DMSO in oxidation reaction and the Schiff base in nucleophilic addition reaction with isocyanides. (C) 2012 Elsevier Ltd. All rights reserved.
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
Tandem approach for the synthesis of imidazo[1,2-a]pyridines from alcohols
作者:Ajjahalli B. Ramesha、Goravanahalli M. Raghavendra、Kebbahalli N. Nandeesh、Kanchugarakoppal S. Rangappa、Kempegowda Mantelingu
DOI:10.1016/j.tetlet.2012.10.112
日期:2013.1
Propylphosphonic anhydride ((R) T3P) is shown to be an effective and mild reagent for the one-pot synthesis of imidazo[1,2-a]pyridines from a variety of alcohols. Alcohols are oxidized in situ to aldehydes under mild conditions, which in turn undergo a three-component reaction with various 2-aminopyridines and isocyanides to afford imidazo[1,2-a]pyridines in excellent yields. T3P acts as an activator for both DMSO in oxidation reaction and the Schiff base in nucleophilic addition reaction with isocyanides. (C) 2012 Elsevier Ltd. All rights reserved.