Novel Schiff bases derived from N-aryl maleimide derivatives as an effective antimicrobial agent: Theoretical and experimental approach

Bioorg Chem. 2020 Oct;103:104129. doi: 10.1016/j.bioorg.2020.104129. Epub 2020 Jul 23.


A set of new Schiff bases of N-aryl 3- and 4-substituted maleimides has been prepared via condensation of N-aryl 3- and 4- substituted maleimides with p-toluene sulfonyl hydrazide in acidic medium at room temperature. The structures of synthesized compounds were characterized by IR, 1H NMR, 13C NMR, MS spectral data, and further confirmed by single-crystal x-ray crystallography for 5c. The computational study was carried out using Gaussian 09 software by using the B3LYP/6-311+G(d,p) basis set. Single-crystal study results showed much closeness with computational study results. These novel compounds were screened for their antimicrobial activity against two pathogenic bacteria such as Escherichia coli (ATCC 8739) and Staphylococcus aureus (ATCC25923) and two pathogenic fungi such as Aspergillus niger (MCIM10231) and Candida albicans (MTCC6275). The investigation of antimicrobial screening data showed that the most of tested compounds are moderate to good microbial inhibitors.

Keywords: Antibacterial; Antifungal activity; N-aryl 3- and 4-substituted maleimide; P-toluene sulfonyl hydrazide; Schiff base.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / chemical synthesis
  • Anti-Bacterial Agents / chemistry
  • Anti-Bacterial Agents / pharmacology*
  • Antifungal Agents / chemical synthesis
  • Antifungal Agents / chemistry
  • Antifungal Agents / pharmacology*
  • Aspergillus niger / drug effects
  • Candida albicans / drug effects
  • Density Functional Theory*
  • Dose-Response Relationship, Drug
  • Escherichia coli / drug effects
  • Maleimides / chemical synthesis
  • Maleimides / chemistry
  • Maleimides / pharmacology*
  • Microbial Sensitivity Tests
  • Molecular Structure
  • Schiff Bases / chemical synthesis
  • Schiff Bases / chemistry
  • Schiff Bases / pharmacology
  • Staphylococcus aureus / drug effects
  • Structure-Activity Relationship


  • Anti-Bacterial Agents
  • Antifungal Agents
  • Maleimides
  • Schiff Bases
  • maleimide