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

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[5,2,4]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.Arylazo compounds have multifarious industrial applications such as printing, electronic photography, liquid crystal displays, laser technology, 1 and dye manufacture. 2Also, they are widely used in chromoionophores because they could exhibit substantial color changes observable by the naked eyes