Ecofriendly and Facile One‐Pot Multicomponent Synthesis of 5‐Phenyl‐5,10‐dihydropyrido[2,3‐d : 6,5‐d′]dipyrimidine‐2,4,6,8(1H,3H,7H,9H)‐tetraone Derivatives Catalyzed by CuII Immobilized on Functionalized Magnetic Mesoporous MCM‐41 (Fe3O4@MCM‐41‐GPTMS‐Gu‐CuII)
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