title: Synthesis and antibacterial activity of some new 1-heteroaryl-5-amino-3H/methyl-4-phenylpyrazoles.
abstract: The regioselective synthesis of 1-heteroaryl-5-amino-4-phenylpyrazoles 3a-g and 1-heteroaryl-5-amino-3-methyl-4-phenylpyrazoles 3h-n was achieved by the treatment of heteroarylhydrazines 1a-g with alpha-phenylformylacetonitrile 2a and alpha-phenylacetylacetonitrile 2b, respectively. The structures of the compounds 3 were established by the combined use of 1H and 13C NMR spectroscopy. All the fourteen compounds were tested for their in vitro antibacterial activity against three Gram-positive and two Gram-negative bacteria. Six compounds 3a, 3d, 3e, 3g, 3l, and 3n from this series were found to be equipotent or more potent than the commercial antibiotics (Linezolid and Cefroxime axetil).
authors.affiliation: Department of Chemistry, Kurukshetra University, Kurukshetra 136 119, India. ranjana67@yahoo.com
authors.forename: Ranjana
authors.initials: R
authors.lastname: Aggarwal
authors.forename: Vinod
authors.initials: V
authors.lastname: Kumar
authors.forename: Parikshit
authors.initials: P
authors.lastname: Tyagi
authors.forename: Shiv P
authors.initials: SP
authors.lastname: Singh
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D001391:Azo Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D002478:Cells, Cultured; D008826:Microbial Sensitivity Tests; D011720:Pyrazoles / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: C470113:3-(2-hydroxynaphth-2-ylazo)-5-phenylpyrazole; D000900:Anti-Bacterial Agents; D001391:Azo Compounds; D011720:Pyrazoles