Synthesis of 2-Aryl-3,4-dihydroisoquinolin-2-ium Bromides and Their in Vitro Acaricidal Activity against Psoroptes cuniculi

  • Ma Yan-Ni
    College of Science, Northwest A&F University
  • Yang Xin-Juan
    College of Life Science, Northwest A&F University College of Science, Northwest A&F University
  • Pan Le
    College of Life Science, Northwest A&F University
  • Hou Zhe
    College of Science, Northwest A&F University
  • Geng Hui-Ling
    College of Science, Northwest A&F University
  • Song Xiao-Ping
    Department of Veterinary Medicine, Northwest A&F University
  • Zhou Le
    College of Science, Northwest A&F University
  • Miao Fang
    College of Life Science, Northwest A&F University

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  • Synthesis of 2-Aryl-3,4-dihydroisoquinolin-2-ium Bromides and Their <i>in Vitro</i> Acaricidal Activity against <i>Psoroptes cuniculi</i>

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By employing sanguinarine, a natural active quaternary isoquinoline alkaloid, as a model molecule, a series of structurally simple quaternary 2-aryl-3,4-dihydroisoquinolin-2-ium compounds were designed and synthesized and evaluated for in vitro acaricidal activity against P. cuniculi. A new approach towards the title compounds was developed with isochroman as starting material. The results showed that 22 of 24 tested compounds displayed the activity in varying degrees at 0.4 mg/mL. Fourteen compounds were significantly more effective than ivermectin, a standard acaricide, and 6-methoxy dihydrosanguinarine, a derivative of sanguinarine (p<0.05). And their comprehensive relative activity was 1.4 to 16.5 times than that of ivermectin and 1.5 to 18.8 times than that of 6-methoxy dihydrosanguinarine. The structure–activity relationship indicated that the introduction of a substituent to N-benzene ring, especially halogen atom and trifluoromethyl group, led to great improvement of the activity. The position of fluorine atom, methyl group and hydroxyl group made very significant effects on the activity. It was concluded that 2-aryl-3,4-dihydroisoquinolin-2-iums are very promising candidates for the development of new isoquinoline acaricidal agents.

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