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Synthesis of 1,2,4-Triazole Benzamide Derivatives and Fungicidal Activity

The synthetic route of substituted 1,2,4-triazole benzamide derivatives was explored, which included several steps such as catalytic cross-coupling of 2,6-dichlorobenzonitrile with a triazole, amidation of nitrile, diazotization of amide and hydrolysis, and amidation of acid. Unreported 14 new 1,2,4-triazole benzamide derivatives were synthesized. Their chemical structures were characterized by H NMR, C NMR and HRMS. Their antifungal activities against Gaeumannomyces graminis var. tritici and Fusarium pseudocerealum were evaluated in vitro by the plate method. The results indicated that antifungal activities of compound 2-chloro-N-phenyl-6-(1H-1,2,4-triazol-1-yl)benzamide (7i) against Gaeumannomyces graminis var. tritici reached up to 80% at the concentrations of 100 mg/L, and were comparable to the control level of silthiopham at the concentrations of 50 and 25 mg/L. However, these compounds didn’t show obvious antifungal activities against Fusarium pseudocerealum.