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A green, efficient and convenient synthesis of pyrano[2,3- d ]pyrimidine scaffolds has been developed  via  one-pot three-component reaction of aryl aldehyde derivatives, malononitrile with barbituric acid/1,3-dimethylbarbituric acid using ethylene glycol (E-G) as a solvent as well as catalyst. Eighteen pyrano[2,3- d ]pyrimidine scaffolds were selected for the library validation. The superiority of this method is environmental safety, catalyst-free, operational simplicity, metal-free, high yields, excellent functional group tolerance, easy workup procedure, less reaction time and the green ethylene glycol can be recovered and reused several times without any loss of efficiency.

Catalyst-Free Three-Component Tandem Green Synthesis of Pyrano[2,3- d ]Pyrimidine Scaffolds in Ethylene Glycol (E-G) as a Recyclable Reaction Medium