Abstract
A new series of 2,3-disubstituted-5-oxochromeno[2,3-b]pyridine derivatives has been obtained throughout a 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-catalyzed reaction of 4-oxo-4H-chromene-3-carbonitrile with various active methyl and methylene compounds. The Friedländer reaction of 2-amino-4-oxo-4H-chromene-3-carboxaldehyde with the same active methyl and methylene compounds led to the identical products, suggesting that basic catalyzed ring rearrangement took place during the course of reaction.
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