Copper-catalyzed [4 + 2] annulation reaction of β-enaminones and aryl diazonium salts without external oxidant: synthesis of highly functionalized 3H-1,2,4-triazines via homogeneous or heterogeneous strategy
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DOI: 10.1039/c9qo01413f
Abstract: Herein, both homogeneous and heterogeneous strategies were developed to access highly functionalized 3H-1,2,4-triazines using Cu-catalyzed [4 + 2] annulation. This new protocol featured external oxidant-free conditions, a non-noble copper catalyst and good functional group compatibility.… read more here.
Keywords: functionalized triazines; homogeneous heterogeneous; external oxidant; catalyzed annulation ... See more keywords