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Recycling experiment for the tandem oxidative cyclization of amines and 1,3-dicarbonyls [reaction conditions: methylacetoacetate (1 mmol), benzylamine (2 mmol), Cu-BPy@Am-SiO2@Fe3O4 catalyst (30 mg), H2O2 (3 equiv), I2 (1.2 equiv), DMF (3 mL), r.t., 3 h].
