Synthesis and antibacterial activity of some 3-[(alkylthio)methyl]quinoxaline 1-oxide derivatives

Abstract
Some 3-[(alkylthio)methyl]quinoxaline 1-oxide derivatives (1) were synthesized and screened for antibacterial activity. 2-Acetyl-3-[(methylsulfonyl)methyl]quinoxaline 1-oxide (7a) possessed good in vitro activity against some pathogens important to veterinary medicine including Treponema hyodysenteriae a causative agent in swine dysentery [also Escherichia coli, Pasteurella multocida and Salmonella cholerae-suis]. In an in vivo experiment, (7a) completely protected pigs against a swine dysentery challenge over a 21-day period.