Abstract
The efficient synthesis of novel fused pyridines via the three component condensation of aldehydes, kojic acid, and 6-amino-1,3-dimethyluracil, catalyzed by the ionic liquid aminopropyl-1,3,5-triazine-2,4-diphosphonium hydrogen sulfate supported on functionalized nano-silica, under solvent-free conditions is reported. Additionally, bis-derivatives of these compounds were smoothly synthesized from dialdehydes. This method has the advantages of mild conditions, high yields, short reaction times, easy work-up, and being environmentally friendly. Moreover, the catalyst can be easily separated from the reaction mixture, recycled, and reused several times without a noticeable decrease in catalytic activity.
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