DABCO‐Catalyzed Double Cascade Cycloaddition of Maleimides with Bisarylhydrazones: Access to Fused Pyrazolo[5,1‐<i>c</i>][1,2,4]triazole Derivatives

Abstract

Abstract A DABCO‐catalyzed double cascade cycloaddition reaction of diverse maleimides with bisarylhydrazones has been developed for the synthesis of a variety of synthetically challenging pyrazolo[5,1‐ c ][1,2,4]triazole derivatives. Dioxygen gas is employed as the sole oxidant in this transformation. It proceeds with high step‐ and atom‐efficiency and shows a broad substrate scope and functional group tolerance, making it a practical approach for the preparation of fully substituted pyrazolo[5,1‐ c ][1,2,4]triazole derivatives. magnified image