Synthesis and Antimicrobial Activities of Novel Quinazolinone Acylhydrazone Derivatives Containing the Indole Moiety

A series of novel quinazolinone acylhydrazone derivatives containing the indole moiety were designed, synthesized, and evaluated for their inhibition activities against some important phytopathogens in vitro. Antibacterial experiments indicated that some compounds exhibited remarkable inhibition activities against tested bacteria. Especially, the EC₅₀ values of 7a (EC₅₀ = 55.13 μg/mL against Xoo, EC₅₀ = 56.92 μg/mL against Rs) demonstrated the best antibacterial activities against Xoo and Rs than the other compounds, and the control agents Bismerthiazol (EC₅₀ = 89.80 μg/mL against Xoo) and Thiodiazole copper (EC₅₀ = 189.52 μg/mL against Rs), moreover, compound 7o (EC₅₀ = 50.80 μg/mL) displayed the excellent activity against Xac than the control Bismerthiazol (EC₅₀ = 56.92 μg/mL).