Abstract
A series of novel (E)‐4‐(4‐((arylidene)amino)phenoxy)coumarin derivatives were synthesized from 4‐hydroxycoumarin in three step reactions, and their antibacterial activities against Xanthomonas oryzae pv. oryzae (Xoo) and Xanthomonas citri subsp. Citri (Xcc) in vitro were evaluated. Result found that most of the target compounds exhibited pronounced antibacterial activities. Among the target compounds, 3f, 3g, 3h, 3i, 3j, 3n, 3o, and 3p exhibited excellent antibacterial activities against Xoo, with EC50 values of 143.9, 127.4, 133.8, 145.8, 138.4, 116.9, 134.6, and 121.8 µg/mL, respectively, which were better than that of thiadiazole copper (203.6 µg/mL). Moreover, compounds 3f, 3g, 3h, 3i, 3j, 3n, 3o, and 3p showed good antibacterial activities against Xcc, with EC50 values of 118.4, 126.3, 117.2, 105.3, 102.3, 95.2, 96.0, and 88.2 µg/mL, respectively, which were similar to that of thiadiazole copper (138.3 µg/mL).
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