Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (3): 373-377.doi: 10.1007/s40242-017-6502-6

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Synthesis and Structure-Activity Relationships of Novel Neocryptolepine Derivatives

Ahmed A. EL-GOKHA1,2, Nader M. BOSHTA1,3, Mona K. ABO HUSSEIN1, Ibrahim EL-T. EL SAYED1   

  1. 1. Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Koam, Menoufia, Egypt;
    2. Department of Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, Eberhard Karls Universität Tübingen, 72076 Tübingen, Germany;
    3. Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, 53121 Bonn, Germany
  • Received:2016-12-23 Revised:2017-03-21 Online:2017-06-01 Published:2017-04-24
  • Contact: Ahmed A.EL-GOKHA,E-mail:aelgokha@yahoo.com E-mail:aelgokha@yahoo.com

Abstract:

Herein we reported the synthesis of a novel series of neocryptolepine(5-methyl-5H-indolo[2,3-b]quinoline) derivatives containing different substituents at C11 using methyl 1H-indole-3-carboxylate and N-methylaniline as starting material. The target 21 compounds were evaluated for their antibacterial activity in vitro against gram-positive bacteria(B. subtilis and S. aureus) and gram-negative bacteria(E. coli and vS. typhi). Almost all the tested compounds showed moderate to high activities against the four bacterial strains at the minimum inhibitory concentrations(MICs) of 1-10 μg/mL. The obtained results suggest that part of the novel synthetic neocryptolepine derivatives exhibit significant antibacterial effect against all the tested organisms.

Key words: Neocryptolepine, Indoloquinoline, Antibacterial