The Synthesis and Biological Evaluation of N‐Substituted 1H‐Benzimidazol‐2‐yl‐1H‐pyrazole‐3,5‐diamines

The synthesis of 1H-benzimidazol-2-yl-1H-pyrazole-3,5-diamines has been developed. Synthesized bisheteroaryls contain two privileged medicinal scaffolds, aminopyrazole and benzimidazole, with two diversity positions at N1 of benzimidazole and C3 of pyrazole, respectively. The three-step synthesis includes the Mitsunobu N-alkylation of benzimidazole and subsequent one-pot formation of aminopyrazole involving substitution of methylthio groups with amine and hydrazine followed with final ring closure. Inhibitory activity toward cyclin-dependent kinase 2/cyclin E and cytotoxicity against two cancer cell lines were evaluated for all novel pyrazoles. Two compounds showed modest cyclin-dependent kinase inhibition activity and cytotoxicity against cancer cell lines K562 and MCF7.

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