Synthesis and antimicrobial activity studies of ortho-chlorodiarylamines and he...

• Author(s): Queiroz, Maria João R.P. ; Ferreira, Isabel C.F.R. ; Gaetanoa, Yannick de ; Kirsch, Gilbert ; Calhelha, Ricardo C. ; Estevinho, Leticia M.
• Date: 2006
• Persistent ID: http://hdl.handle.net/10198/826
• Origin: Biblioteca Digital do IPB
• Subject(s): Benzothiophenes; Ortho-chlorodiarylamines; Palladium; Thienocarbazoles; Thienocarboline; Antimicrobial activity
• Document Type: Article
• Language: English

Description

ortho-Chlorodiarylamines in the 2,3,7-trimethylbenzo[b]thiophene series were prepared in high yields (70–85%) by C–N palladium-catalyzed cross-coupling using P(t-Bu)3 as ligand and NaOt-Bu as base. A palladium-assisted C–C intramolecular cyclization of the coupling products gave thienocarbazoles and the dechlorinated diarylamines. Studies of antimicrobial activity of the compounds obtained, against representative species of bacteria (Escherichia coli, Pseudomonas aeruginosa, Bacillus cereus and Bacillus subtilis) and fungi (Candida albicans), were performed. We have also included in the biological assays some pyridine derivatives previously prepared by us, and it was possible to establish some structure–activity relationships (SARs).