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Synthesis, characterization and in vitro biological screening of 4-hydroxy naphthalen-1-yl, naphtho[1,2-b]furan, benzo[h]chromene and 5,6-dihydropyridazine derivatives containing sulfonamide moiety

Mohamed S. A. El-Gaby, Mohamed I. Hassan, Modather F. Hussein, Ahmed M. Ali, Mahmoud M. Elaasser, Faraghally A. Faraghally


In this study, a series of 4-((4-hydroxynaphthalen-1-yl)diazenyl)benzenesulfonamides 3 have been prepared by subsequent diazotization of sulfonamide derivatives 1 and coupling with 1-naphthol 2 in alkaline medium. Cyclization of compounds 3 with cinnamic acid 4 in the presence of a basic catalyst afforded the novel naphtha[1,2-b]furans 6. Also, compound 3 can be cyclized with α‐cyanocinnamonitriles 7 to afford 2-amino-3-cyano-4-phenyl-4H-benzo[h]chromenes 8. 4-(4-amino-3,5-dicyano-6-iminopyridazin-1(6H)-yl)benzenesulfonamides 11 were obtained at room temperature by treatment of 2-amino-1,1,3-tricyanopropene 9 with a diazonium salt of sulfonamide derivatives 1. The structures of newly synthesized compounds were confirmed by analytical data and spectroscopic techniques. The antimicrobial activity of the obtained compounds was assessed in vitro by qualitative and quantitative (minimum inhibitory concentration) (MIC) assays.

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