Synthesis and evaluation of larvicidal efficacy against <i>C. pipiens</i> of some new heterocyclic compounds emanated from 2‐cyano‐<i>N</i>′‐(2‐(2,4‐dichlorophenoxy)acetyl)acetohydrazide

Abstract

Several infectious diseases are transmitted and spread by mosquitoes, and millions of people die annually from them. The mosquito, Culex pipiens is a responsible for the emergence of various Virus in Egypt. So, we devote our work to evaluate the larvicidal efficacy against C. pipiens of some new heterocyclic compounds containing chlorine motifs. The implementation was emanated from using 2-cyano-N'-(2-(2,4-dichlorophenoxy)acetyl)acetohydrazide (3) as scaffold to synthesize some new heterocyclic compounds. The structures of the synthesized compounds were interpreted scrupulously by spectroscopic and elemental analyses. Thereafter, the larvicidal activity against C. pipiens of thirteen synthesized compounds was estimated. Noteworthy, cyanoacetohydrazide derivative 3 and 3-iminobenzochromene derivative 12 showed a fabulous potent efficacy with LC₅₀ equal to 3.2 and 3.5 ppm against C. pipiens, respectively, and are worth being further evaluated in the field of pest control.