Design, Synthesis, and in vitro Antimicrobial Activity of New Furan/Thiophene-1,3-Benzothiazin-4-one Hybrids

摘要

This study presents the design, synthesis, spectral analysis, and in vitro antimicrobial evaluation of a new series of furan/thiophene-1,3-benzothiazin-4-one hybrids (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32). New compounds were obtained by cyclization reaction of N-substituted furan/thiophene-2-carboxamide derivatives (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16) with thiosalicylic acid. All synthesized compounds were screened for their in vitro antimicrobial activities using the broth microdilution method. Nine of the synthesized compounds showed good activity against Gram-positive, Gram-negative bacteria, and yeasts belonging to Candida spp. (MIC = 7.81-500 g/mL), especially against Staphylococcus spp. (MIC = 15.62-62.5 g/ml), Bacillus spp. (MIC = 7.81-62.5 g/mL), Bordetella bronchiseptica ATCC 4617 (MIC = 62.5-125 g/mL), and fungistatic activity against Candida spp. (MIC = 62.5-125 g/mL).