Domino Reactions of Chromone-3-carboxylic Acids with Aminoheterocycles: Synthesis of Heteroannulated Pyrido[2,3-c]coumarins and their Optical and Biological Activity.
A series of new heteroannulated pyrido[2,3-c]coumarins have been prepared by the domino reactions of chromone-3-carboxylic acid derivatives with electron-rich binucleophilic aminoheterocycles. The products contain the core structures of coumarin, pyridine, and an annulated five-membered heterocyclic system, namely pyrazole, pyrrole, or isoazole. The fluorescence of the products was investigated. The products inhibit ecto-5′-nucleotidase (e5′NT) enzymatic activity.