Abstract
A copper-organic framework Cu-CPO-27 was synthesized, and utilized as a recyclable heterogeneous catalyst for the direct CH amination of quinoxalin-2(1H)-ones with amines to produce 3-aminoquinoxalin-2(1H)-ones. High yields were achieved in the presence of molecular oxygen as the oxidant. This framework was more catalytically active than a number of MOF-based catalysts. The Cu-CPO-27 also displayed higher performance than CuFe2O4 nanoparticles. The copper-organic framework catalyst could be reutilized in the synthesis of 3-aminoquinoxalin-2(1H)-ones via the direct CH amination reaction without a remarkable deterioration in catalytic performance. To our best knowledge, this is the first heterogeneous catalytic protocol to generate 3-aminoquinoxalin-2(1H)-ones.
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