Synthesis of benzo [d] [1, 2, 3] thiadiazole-7-carbaldehyde

Ethyl benzo[d][1,2,3] thiadiazole-7-caiboxylate was synthesized through substituation, esterification, diazotization and reduction, with 2-chloro-3, 5-dinitro-benzoic acid as beginning material;and benzo[d][1,2,3] thiadiazole-7-carbaldehyde was firstly prepared from the reduction of ethyl benzo [d][1,2,3] thiadiazole-7-caiboxylate by DIBAL-H.