Synthesis and in vitro antimicrobial activity of N-arylquinoline derivatives bearing 2-morpholinoquinoline moiety

A new series of N-arylquinoline derivatives 5a-x bearing 2-morpholinoquinoline moiety has been synthesized by one pot base catalyzed cyclocondensation reaction of 2-morpholinoquinoline-3-carbaldehydes 2a-c, malononitrile 3 and β-enaminones 4a-h. All the synthesized compounds were screened for their in vitro antimicrobial activity against six bacterial pathogens, namely Streptococcus pneumoniae, Clostridium tetani, Bacillus subtilis, Salmonella typhi, Vibrio cholerae, Escherichia coli and against two fungal pathogens, Aspergillus fumigatus and Candida albicans using broth microdilution MIC method. Of the compounds studied, majority of the compounds were found to active against C. tetani, B. subtilis and C. albicans as compared to first-line standard drugs.