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A novel tandem one-pot method for the synthesis of polysubstituted pyridine derivatives has been developed via Knoevenagel-type reaction and subsequent 6π electrocyclization of the Blaise reaction intermediates and 3-formylchromones. Short reaction time, moderate to good yields and excellent functional group tolerance have been accomplished in this protocol.
A concise and efficient synthetic approach was developed for the synthesis of functionalized chromeno[4,3-b]pyrrol-4(1H)-ones via a one-pot, three-component reaction of 4-aminocoumarin, arylglyoxal monohydrates, and aromatic amines promoted by KHSO 4 in toluene under reflux condition. The attractive features of this protocol are operational simplicity, short reaction time, easy purification...
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