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A one‐pot strategy for the synthesis of α‐bromo enaminones is reported. The reactions proceed via the p‐toluenesulfonic acid monohydrate (TsOH ⋅ H2O) catalyzed reactions of 3‐bromopropenals with anilines in dimethyl sulfoxide (DMSO) and does not require an external brominating agent. The chemoselective 1,2‐addition was accomplished by employing aniline with a sterically hindered electron‐withdrawing...
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