Synthesis and biological evaluation of 2-phenyl-4-aminoquinolines as potential antifungal agents

  • Rui YangEmail author
  • Wenhao Du
  • Huan Yuan
  • Tianhong Qin
  • Renxiao He
  • Yanni Ma
  • Haiying DuEmail author
Original Article


A series of 2-phenyl-4-aminoquinolines were designed, synthesized and evaluated for their antifungal activities against three phytopathogenic fungi in vitro. All of the target compounds were fully elucidated by 1H NMR, 13C NMR and HRMS spectra. The results indicated that most of the target compounds demonstrated significant activities against the tested fungi. Among them, compound 6e exhibited more promising inhibitory activities against C. lunata (EC50 = 13.3 μg/mL), P. grisea (EC50 = 14.4 μg/mL) and A. alternate (EC50 = 15.6 μg/mL), superior to azoxystrobin, a commercial agricultural fungicide. The structure–activity relationship (SAR) revealed that the aniline moiety at position 4 of the quinoline scaffold played a key role in the potency of a compound. And the substitution positions of the aniline moiety significantly influenced the activities. These encouraging results yielded a variety of 2-phenylquinolines bearing an aniline moiety acting as promising antifungal agents.

Graphic abstract


4-Aminoquinoline Phytopathogenic fungi Antifungal activity Structure–activity relationship 



This work was funded by the National Natural Science Foundation of China (No. 31601670) and the Foundation of Education Department of Sichuan Province (No. 18ZB0079).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11030_2019_10012_MOESM1_ESM.docx (4.7 mb)
Supplementary material 1 (DOCX 4819 kb)


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.College of Materials, Chemistry & Chemical EngineeringChengdu University of TechnologyChengduPeople’s Republic of China
  2. 2.Key Laboratory of Natural ProductsHenan Academy of SciencesZhengzhouPeople’s Republic of China
  3. 3.College of EnvironmentChengdu University of TechnologyChengduPeople’s Republic of China

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