Clean Procedure and DFT Study for the Synthesis of 2-Amino-3-ethoxycarbonyl-4-(aryl)-4H-pyrano-[3,2-c]-chromene-5-ones Derivatives: A Novel Class of Potential Antimicrobial and Antioxidant Agents : Scheme 4

Scheme 4: Scavenging effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical of compounds 5.