Eswaran, S.Vasudeva Adhikari, A.V.Chowdhury, I.H.Pal, N.K.Thomas, K.D.2026-02-052010European Journal of Medicinal Chemistry, 2010, 45, 8, pp. 3374-33832235234https://doi.org/10.1016/j.ejmech.2010.04.022https://idr.nitk.ac.in/handle/123456789/27537Four new series of quinoline derivatives were synthesized starting from 2-trifluoromethyl aniline through multi-step reactions. In the reaction sequence,substituted aniline was cyclized to 4-hydroxy quinoline 1,which was then transformed to 4-chloro-2,8-bis(trifluoromethyl)quinoline 2. The key scaffold 4-hydrazinyl-2,8-bis(trifluoromethyl)quinoline 3,obtained from the compound 2,was successfully converted to target quinoline derivatives,viz. hydrazones 4aet,ureas 5aee,thioureas 6aec and pyrazoles 7aed,in good yields. The newly synthesized title compounds were evaluated for their in vitro antibacterial activity against Escherichia coli,Staphylococcus aureus,Pseudomonas aeruginosa and Klebsiella pneumoniae (recultured) and antituberculosis activity against Mycobacterium tuberculosis H<inf>37</inf>Rv and MDR-TB. Preliminary results indicated that most of the hydrazone derivatives demonstrated very good antibacterial and antituberculosis activities while other derivatives showed moderate activity. © 2010 Elsevier Masson SAS. All rights reserved.1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 (2 fluoro 4 methoxybenzylidene)hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 (3 hydroxy 4 methoxybenzylidene)hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 (cyclohexylmethylene)hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 2 [(benzo[c][1,2,5]oxadiazol 5 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 octylidenehydazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(1 methyl 1h benzo[d][1,2,3]triazol 5 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(1 methyl 1h pyrrol 2 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(2,3 dihydrobenzofuran 5 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(4 bromofuran 3 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(4 chloro 1 methyl 1h pyrazol 3 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(4 methyl 1h imidazol 5 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(5 (acetoxymethyl)furan 2 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(5 methoxy 1h indol 3 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(7 methyl 1h indol 3 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(pyridin 3 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [(thiophen 2 yl)methylene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 2 [3 (trifluoromethoxy)benzylidene]hydrazine1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 4 (3 cyanophenyl)semicarbazide1 (2,8 bis(trifluoromethyl)quinolin 4 yl) 4 (4 fluorophenyl)semicarbazide1 (2,8 bis(trifluoromethyl)quinolin 4 yl)2 (3 (1,1,2,2 tetrafluoroethoxy)benzylidene)hydrazine2 [(1h imidazol 4 yl)methylene] 1 [2,8 bis(trifluoromethyl)quinolin 4 yl]hydrazine2 [[2 [2,8 bis(trifluoromethyl)quinolin 4 yl]hydrazinylidene]methyl] 5 fluorophenolantiinfective agenthydrazone derivativepyrazole derivativequinoline derivativethiourea derivativetuberculostatic agentunclassified drugunindexed drugurea derivativeantibacterial activityarticledrug synthesisEscherichia coliin vitro studyKlebsiella pneumoniaemultidrug resistant tuberculosisMycobacterium tuberculosisnonhumanPseudomonas aeruginosaStaphylococcus aureus