title: A convenient 'one-pot' synthesis and in vitro microbiological evaluation of novel 2,7-diaryl-[1,4] -diazepan-5-ones.
abstract: A convenient method for the 'one-pot' synthesis of novel target molecule 2,7-diaryl-[1,4]-diazepan-5-ones from the respective 2,6-diaryl-piperidin-4-ones was catalyzed by NaHSO4.Al2O3 heterogeneous catalyst in dry media under microwave irradiation in solvent-free conditions. Moreover, the catalyst could be recovered and re-used up to 4 times after washing with ethyl acetate. They were evaluated for potential antibacterial activity against Staphylococcus aureus, beta-Haemolytic streptococcus, Vibreo cholerae, Salmonella typhii, Escherichia coli, Klebsiella pneumonia, Pseudomonas and antifungal activity against Aspergillus flavus, Aspergillus fumigatus, Mucor, Candida albicans and Rhizopus. Structure-Activity Relationship (SAR) led to the conclusion that, of all the compounds 25-32 tested, compound 30 exerted strong in vitro antibacterial activity against S. aureus, S. typhii, and Pseudomonas and all the compounds 25-32 were less active against E. coli, whereas all the compounds 25-32 displayed potent in vitro antifungal activity against all the fungal strains used, except compound 30, which was more effectual against Mucor.
authors.affiliation: Department of Chemistry, Annamalai University, Annamalainagar-608 002, Tamil Nadu, India. emgeekk@yahoo.co.in
authors.forename: M
authors.initials: M
authors.lastname: Gopalakrishnan
authors.forename: P
authors.initials: P
authors.lastname: Sureshkumar
authors.forename: J
authors.initials: J
authors.lastname: Thanusu
authors.forename: V
authors.initials: V
authors.lastname: Kanagarajan
authors.forename: R
authors.initials: R
authors.lastname: Govindaraju
authors.forename: G
authors.initials: G
authors.lastname: Jayasri
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D000935:Antifungal Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D001381:Azepines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D050296:Microbial Viability / Q000187:drug effects; D015394:Molecular Structure; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D001381:Azepines