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■ A Facile Green Synthesis and Anti-Cancer Activity of bis-Arylhydrazononitriles, Triazolo[5,1-c][1,2,4]triazine, and 1,3,4-Thiadiazolines

Sobhi M. Gomha, Khaled D. Khalil, Ali M. El-Zanaty, and Sayed M. Riyadh*

*Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt

Abstract

Coupling of 2-cyanoacetyl-1-methyl-1H-pyrrole (1) with diazonium salts of 1,4-benzenediamine (2), 2,6-dichlorobenzene-1,4-diamine (4), and benzidine (6) afforded bis-arylhydrazononitriles 3, 5, and 7, respectively. Also, coupling of 1 with [1,2,4]triazole-3-diazonium sulfate (8) gave the respective [1,2,4]triazolo[5,1-c][1,2,4]triazine derivative 11. On the other hands, treatment of 2-[(1-methyl-1H-pyrrol-2-yl)carbonyl]-3-mercapto-3-(phenylamino)acrylonitrile (12) with hydrazonoyl chlorides 13a-h in dioxane, in the presence of chitosan as eco-friendly heterogeneous basic catalyst, under microwave irradiation furnished 1,3,4-thiadiazolines 16a-h, incorporating pyrrole moiety. The anti-cancer activities of the synthesized products were determined against the colon carcinoma (HCT), human laryngeal carcinoma (Hep-2), human medulloblastoma (Daoy), human breast adenocarcinoma (MCF-7), and human colon adenocarcinoma (WiDr) cell lines.