N-{3-[(4-Methylbenzene-1-sulfonyl)imino]-6-oxocyclohexa-1,4-dien-1-yl}arylamides and their derivatives were synthesized by the reaction of the corresponding N-(4-oxocyclohexa-2,5-dien-1-ylidene)arylsulfonamides with N-chloramides. The biological activity of the synthesized compounds was studied on test cultures of Escherichia coli 67, Staphylococcus aureus 209-p, Mycobacterium luteum VKM B-868 and fungi Candida tenuis VKM Y-70, Aspergillus niger VKM F-1119 by the method of diffusion of substances into agar on a solid nutrient medium. The degree of activity of the test compounds was determined by the diameter of the zones of inhibition of growth of test cultures of microorganisms. The minimum inhibitory, bactericidal and fungicidal concentrations were determined by the method of serial dilutions of the substance in a liquid nutrient medium. At the studied concentration, the method of diffusion of substances into agar on a solid nutrient medium has shown that these compounds have low activity against bacteria Escherichia coli, Staphylococcus aureus, Mycobacterium luteum and fungi Candida tenuis, Aspergillus niger. The diameters of the zones of inhibition of growth of test cultures of microorganisms were less than 15 mm. In research by the method of serial dilutions of the substance in a liquid nutrient medium, they have been found to have bactericidal and fungicidal activity. The minimum inhibitory concentration of N-{2-hydroxy-5-[(4-methylbenzene-1-sulfonyl)amino]phenyl}benzamide was 31.2 μg/ml against bacteria Mycobacterium luteum. The minimum inhibitory concentration of N-{2-hydroxy-3-methyl-5-[(4-methylbenzene-1-sulfonyl)amino]phenyl}benzamide against fungi Aspergillus niger was 31.2 μg/ml. The minimum bactericidal concentration of N-{2-hydroxy-5-[(4-methylbenzene-1-sulfonyl)amino]phenyl}benzamide was 62.5 μg/ml against bacteria Mycobacterium luteum. Minimum fungicidal concentration of N-{3-[(4-methylbenzene-1-sulfonyl)imino]-6-oxocyclohexa-1,4-dien-1-yl}benzamide and N-{2-hydroxy-3-methyl-5-[(4-methylbenzene-1-sulfonyl)amino]phenyl}benzamide was 62.5 μg/ml in action to mold fungi Aspergillus niger.
BMS-192548, a Tetracyclic Binding Inhibitor of Neuropeptide Y Receptors, from Aspergillus niger WB2346. I. Taxonomy, Fermentation, Isolation and Biological Activity.