10.3184/030823409X12508790019612
The study investigates the synthesis, reactions, and antimicrobial activity of thieno[2,3-c]pyridazine derivatives. The research involves the reaction of N1-(un)substituted 4-aminosulfonamide with 6-chloropyridothienopyridazine (5) and 8-chloropyrimidothienopyridazine (14) to produce 6-substituted aminopyridothienopyridazine (9) and 8-substituted aminopyrimidothienopyridazine (16) respectively. These derivatives are characterized by analytical and spectroscopic studies and tested for their in vitro antibacterial and antifungal activity against various microorganisms. The study also explores the synthesis of other related compounds such as 7-cyano-3,4,8-triphenylpyrido[2',3' : 4,5]thieno[2,3-c]pyridazin-6(5H)-one (4), 6-chloro-7-cyano-3,4,8-triphenylpyrido[2',3' : 4,5]thieno[2,3-c]pyridazine (5), and their various substituted derivatives. The antimicrobial activity of the synthesized compounds is evaluated against Gram positive bacteria (Staphylococcus aureus, Bacillus subtilis), Gram negative bacteria (Escherichia coli, Pseudomonas aeruginosa), yeast (Candida albicans), and fungi (Aspergillus niger). The results indicate that several compounds exhibit high and very high antimicrobial activity against the tested microorganisms, comparable to standard antibacterial and antifungal agents.