title: Synthesis, tuberculosis inhibitory activity, and SAR study of N-substituted-phenyl-1,2,3-triazole derivatives.
abstract: The aim of this work was to describe the synthesis, the in vitro anti-Mycobacterium tuberculosis profile, and the structure-activity relationship (SAR) study of new N-substituted-phenyl-1,2,3-triazole-4-carbaldehydes (3a-l). The reactions of aromatic amine hydrochlorides with diazomalonaldehyde (1) produced several N-substituted-phenyl-1,2,3-triazole-4-carbaldehydes (3a-l) in moderate-to-good yields. In order to investigate the influence of the difluoromethylene group on the anti-Mycobacterium activity of these compounds, fluorination of triazoles with DAST converted the corresponding carbaldehyde compounds into new difluoromethyl derivatives (4a-l) in excellent yield. Characterization of all compounds was achieved by spectroscopic means and additional for 1-(4-methylphenyl)-1,2,3-triazole-4-carbaldehyde, 3k by X-ray crystallography. Compounds (3a-l) and (4a-l) have been screened for the inhibitory activity against Mycobacterium tuberculosis H37Rv strain (ATCC 27294) and all of them were able to inhibit the growth of the bacterium. Interestingly, 3a and 3k exhibited the best inhibition with MIC values of 2.5mug/mL, similar to pharmaceuticals currently used in the treatment of tuberculosis. Our SAR study indicated the importance of the hydrogen bond acceptor subunit (3a-l), the position in the aromatic ring, the planarity of triazole and phenyl rings in these compounds, and a correlation between the uniform HOMO coefficient distribution and the anti-tubercular activity. The significant activity of 3a and 3k pointed them as promising lead molecules for further synthetic and biological exploration.
authors.affiliation: Fundação Oswaldo Cruz, Instituto de Tecnologia em Fármacos, Departamento de Síntese Orgânica, Manguinhos, CEP 21041250, Rio de Janeiro, RJ, Brazil.
authors.forename: Marilia S
authors.initials: MS
authors.lastname: Costa
authors.forename: Núbia
authors.initials: N
authors.lastname: Boechat
authors.forename: Erica A
authors.initials: EA
authors.lastname: Rangel
authors.forename: Fernando de C
authors.initials: Fde C
authors.lastname: da Silva
authors.forename: Alessandra M T
authors.initials: AM
authors.lastname: de Souza
authors.forename: Carlos R
authors.initials: CR
authors.lastname: Rodrigues
authors.forename: Helena C
authors.initials: HC
authors.lastname: Castro
authors.forename: Ivan N
authors.initials: IN
authors.lastname: Junior
authors.forename: Maria Cristina S
authors.initials: MC
authors.lastname: Lourenço
authors.forename: Solange M S V
authors.initials: SM
authors.lastname: Wardell
authors.forename: Vitor F
authors.initials: VF
authors.lastname: Ferreira
mesh_terms: D000995:Antitubercular Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D015394:Molecular Structure; D009169:Mycobacterium tuberculosis / Q000187:drug effects*; D013329:Structure-Activity Relationship; D014230:Triazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D014376:Tuberculosis / Q000188:drug therapy*
chemical_list: C516704:1-(4-methylphenyl)-1H-1,2,3-triazole-4-carbaldehyde; D000995:Antitubercular Agents; D014230:Triazoles