Medicinal Chemistry

Synthesis of Some Bioactive Sulfonamide and Amide Derivatives of Piperazine Incorporating Imidazo[1,2-B]Pyridazine Moiety

Abstract

Ashish Bhatt, Ravi Kant and Rajesh K Singh

Some new sulfonamide and amide derivatives containing piperazine ring and imidazo[1,2-b]pyridazine moiety have been synthesized by the reaction of 6-chloro-2-substituted aryl(or alkyl)imidazo[1,2-b]pyridazine derivatives [obtained by the reaction of 3-amino-6-chloro pyridazine with 2-bromo-1-substituted aryl(or alkyl)ethanone] with homopiperazine in NMP and followed by reaction with alkyl (or substituted aryl) acid chloride or sulfonyl chloride in presence of triethyl amine and dichloromethane. All the synthesized compounds were characterized by elemental analysis, 1H NMR and LCMS. These were screened for in vitro antimicrobial activity against two gram positive (Bacillus subtilis and Staphylococcus aureus) and two gram negative bacteria (Pseudomonas fluorescens and Escherichia coli), as well as for antifungal and antimalarial activity.