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Herein, we report the synthesis of different steroidal thiazolo quinoxaline derivatives as antibacterial agents against Escherichia coli. Steroidal ketone thiosemicarbazones (4-6) were obtained from corresponding ketones (1-3) by refluxing with thiosemicarbazide. The thiosemicarbazones on reaction with 2,3-dichloroquinoxalines at 80 C gives 3beta-acetoxy-5alpha-cholestan-6-[thiazolo(4,5-b)quinoxaline-2-yl-hydrazone] (7), 3beta-chloro-cholestan-6-[thiazolo(4,5-b)quinoxaline-2-yl-hydrazone] (8), and 5alpha-cholestan-6-[thiazolo(4,5-b)quinoxaline-2-yl-hydrazone] (9). The structures of the compounds were evident by elemental, IR, 1H NMR and FAB mass spectral analyses. The antibacterial activities of these compounds were evaluated by disk diffusion method against the culture of E. coli and the results were compared with the standard drug amoxicillin. The results reveal that the compounds are better antibacterial agents as compared to amoxicillin. Among all the three compounds (7-9), compound 8 showed better zone of inhibition.
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.name: 2,3-Dichloroquinoxaline, you can also check out more blogs about2213-63-0
Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N1399 | ChemSpider