s with Zn/NH4Cl gave the corresponding quinoline N‐oxides in 80–90% yields. The reaction initiated the reduction of nitro group to afford the corresponding hydroxylamine, which intramolecularly condensed and followed by dehydration to give quinoline N‐oxide. Although treatment of 2‐nitrochalcone with Zn/NH4Cl in EtOH/H2O resulted in the formation of quinoline N‐oxide in low yield, the reaction of 2‐nitrochalcone