Abstract
The synthesis of polyfunctionalized 7‐amino‐5‐(4‐aroyl)‐1,3‐dimethyl‐2,4‐dioxo‐1,2,3,4,5,8‐hexahydropyrido[2,3‐d]pyrimidine‐6‐carbonitrile derivatives by a green approach was achieved via one‐pot three‐component reaction of arylglyoxals, malononitrile, and 1,3‐dimethyl‐6‐aminouracil in the presence of urea as organocatalyst in EtOH:H2O (1:1) at 60°C. This protocol provides a mild and fast procedure to structurally diverse bicyclic pyridopyrimidines in good to excellent yields.
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