This review reports the chemistry of 1,2,4-triazepines. Heterocyclic 1,2,4-triazepines are mono and fused cycles.

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3‐(1H‐Indol‐3‐yl)‐1H‐pyrazol‐5‐amine 3 was prepared in a quantitative yield by heating 3‐(1H‐indol‐3‐yl)‐3‐oxopropanenitrile 2 in dry ethanol with hydrazine hydrate, and utilized as key intermediate for the synthesis of some new pyrazolo[1,5‐a]pyrimidines and pyrazolo[5,1‐c]triazines. Structures of the newly synthesized compounds were established by elemental analysis and spectral data and evaluated as antioxidant agents. Most of the tested compounds belonging to the pyrazolo[1,5‐a]pyrimidine series exhibited better activities than members of the pyrazolotriazine one.

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The current study provides an overview of the synthetic routes, reactivity and privileged biological characteristics of bicyclic heterocycles incorporating pyrimido[1,6-a]pyrimidine and pyrimido[1,6-c]pyrimidine cores.

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