An Efficient and Rapid Synthesis of 1,4-Dihydropyrano[2,3-c]Pyran and 1,4-Dihydropyrano[2,3-c]Quinoline Derivatives Using Copper Nanoparticles Grafted on Carbon Microspheres

A rapid and efficient one-pot three-component synthesis of 2-amino-3-cyano-4-aryl-7-methyl-5-oxo-4,5-dihydro-pyrano-[3,2-c]pyran and 2-amino-3-cyano-4-aryl-6-methyl5,6-dihydro-5-oxo-4H-pyrano-[3,2-...